Metrics details The biology of extinct animals is usually reconstructed from external morphological characters and comparison with present-day analogues Internal soft organs are very rarely preserved in fossils and require high-tech approaches for visualization we report the internal anatomy of a female and male of the ~ 162 Myr-old lobster Eryma ventrosum from the Jurassic La Voulte-sur-Rhône Konservat-Lagerstätte in France using X-ray synchrotron tomography widespread and ecologically important Mesozoic family of decapod crustaceans Our investigation revealed the anatomy of the locomotory and reproductive systems at a resolution resembling low-magnification histology Particularly notable is the detailed preservation of the small brain and the fragile hepatopancreas the main metabolic organ of decapods that decays rapidly post-mortem The remarkable preservation shows that the internal anatomy of Eryma ventrosum is closer to that of Nephropidae (clawed lobsters) than Astacidae (freshwater crayfish) their closest living relatives based on skeletal morphology The microanatomy of the gonads and hepatopancreas indicates that the two specimens investigated were a young well-nourished female and male prior to sexual maturity The analysis of the soft anatomy reveals remarkable conservatism over 160 Myr and offers new insights into feeding life history and lifestyle of an important component of the macrozoobenthos of Middle Jurassic seas Historical specimens of Eryma ventrosum enclosed in carbonate nodules from La Voulte (b,c) Lateral and dorsal views of female OSUG-IDID11544 (d) Lateral view of carapace MNHN.F.A59527 (f–i) 3D reconstruction of female carapace and pleon with line drawings of carapace groove pattern (lateral and dorsal views) (j) Lateral view of large specimen OSUG-ID11906 Line drawings illustrate the main synapomorphies at relevant nodes Understanding the evolutionary history of Erymoidea is thus critical to interpreting the evolution of modern Astacidea particularly their adaptive capability and factors that could lead to their extinction but the new information includes details of the brain heart and elements of the circulatory system Male specimen of Eryma ventrosum: 3D-reconstruction and X-ray images of internal soft organs (a) Dorsal view with exoskeleton removed to show soft parts (b) Transverse section of pyloric ampullae (e) Reconstruction of heart with muscles (visible through transparency) running in different directions (f,g) Anterior and lateral views of testis and vas deferens (h) Transverse section of basal articles of antennulae with their statocysts (l) Transverse section of hepatopancreas lobes (m) Transverse section of hindgut with folds (p) Horizontal section of testis revealing H-shaped morphology (q) Transverse section of vas deferens under testis The opening consists of an anterior suture along the longitudinal midline of the sternum and a posterior cup with two oblique lateral notches The spermatheca in the posterior part of the female endophragmal skeleton is the best-preserved sperm storage structure known in a fossil decapod Their presence suggests that decapods have been able to sense gravity frequency vibrations and possibly angular acceleration since at least the Middle Jurassic This indicates that Eryma fed on soft tissue but this food may have been accessed by using the toothed chelipeds to crush mollusc shells A terminal dactylus is present on pereiopod 4 in both male and female Pereiopod 5 also bears a terminal dactylus in the male an arrangement similar to that in many living clawed lobsters The soft parts described here provide a definitive identification of the Eryma specimens as female and male Their feeding (mandibles and gastric ossicles) and reproductive (spermatheca) systems more closely resemble those of Nephropidae (clawed lobsters) than Astacidae (crayfish) The additional details revealed by our study point a way forward to incorporating internal anatomy into phylogenetic analyses of fossil decapods but more examples need to be investigated in the same way to provide comparable data for other higher taxa in order to realize this goal the stem-group status of erymid lobsters suggests that the character states they share with clawed lobsters are ancestral for Astacidea whereas the internal anatomy of crayfish (Astacidae) may be more derived The preservation of details of the reproductive organs allows the female and male to be distinguished evidence of the gonads and hepatopancreas indicate that these were young well-fed lobsters The fossils occur in carbonate concretions which were mechanically opened to reveal dorsal (UJF-ID11543) and left lateral UJF-ID11544 views respectively The matrix surrounding the fossil was covered with Indian ink for the figures in Van Straelen (1925 We analysed two additional larger specimens of Eryma ventrosum from La Voulte-sur-Rhône, likewise three-dimensionally preserved in carbonate concretions (Fig. 1d j): MNHN.F.A59527 is an isolated carapace and well-preserved eye with ommatidia and UJF-ID11906 is a very large but incomplete adult The specimens were first imaged at the AST-RX technical platform of the MNHN with a GE Phoenix v│tome│ × 240 L tomograph equipped with a microfocus 240 kV/320 W tube delivering a current/voltage of 240 µA/130 kV for UJF-ID11543 and 240 µA/140 kV for UJF-ID11544 A voxel size of 31.253 µm for UJF-ID11543 and 32.778 µm for UJF-ID11544 was obtained 3D rendering was performed with Maxon Cinema 4D R25.010 This research complies with all relevant ethical regulations Lagerstätte de La Voulte: Un Environnement Bathyal au Jurassique (Publications Scientifiques du Muséum Ecological significance of the arthropod fauna from the Jurassic (Callovian) La Voulte Lagerstätte New sea spiders from the Jurassic La Voulte-sur-Rhône Lagerstätte Rowe, A. et al. Exceptional soft-tissue preservation of Jurassic Vampyronassa rhodanica provides new insights on the evolution and palaeoecology of vampyroteuthids. Sci. Rep. https://doi.org/10.1038/s41598-022-12269-3 (2022) Sea stars from Middle Jurassic lagerstätte of La Voulte-sur-Rhône (Ardèche Mineralization of soft-bodied invertebrates in a Jurassic metalliferous deposit Jauvion, C. et al. Exceptional preservation requires fast biodegradation: thylacocephalan specimens from La Voulte‐sur‐Rhône (Callovian, Jurassic, France). Palaeontology pala.12456. https://doi.org/10.1111/pala.12456 (2019) Virtual dissection and lifestyle of a 165-million-year-old female polychelidan lobster A new polychelidan lobster preserved with its eggs in a 165 Ma nodule Exceptional preservation of eye structure in arthropod visual predators from the Middle Jurassic Lobster (Decapoda) diversity and evolutionary patterns through time A synthesis of the evolutionary history of erymoid lobsters (Crustacea 1840 (Crustacea: Decapoda: Erymidae): New synonyms An attempt to clarify phylogenetic affinities of erymid lobsters (Decapoda) using morphological characters The emergence of lobsters: Phylogenetic relationships morphological evolution and divergence time comparisons of an ancient group (Decapoda: Achelata Muscles and muscle scars in fossil malacostracan crustaceans Secretan-Rey, S. Monographie du Squelette Axial de Nephrops norvegicus (Linné, 1758). https://doi.org/10.5281/ZENODO.5756017 (2002) (Blackwell Science ; Iowa State University Press [distributor] Patterns and bilateral coordination of scaphognathite rhythms in the lobster Homarus americanus The oldest shrimp (Devonian: Famennian) and remarkable preservation of soft tissue Fossils and the evolution of the arthropod brain An exceptionally preserved arthropod cardiovascular system from the early Cambrian Central nervous system of a 310-m.y.-old horseshoe crab: Expanding the taphonomic window for nervous system preservation Reconstructing the anatomy of the 42-million-year-old fossil †Mengea tertiaria (Insecta M.) 53–151 (Blackwell Science ; Iowa State University Press [distributor] Constant morphological patterns in the hemolymph vascular system of crayfish (Crustacea Phylogeny and systematics of extant and extinct lobsters A eucrustacean from the Cambrian ‘Orsten’ of Sweden with epipods and a maxillary excretory opening Aggio, J. & Derby, C. D. Chemical communication in lobsters. In Chemical Communication in Crustaceans (eds. Breithaupt, T. & Thiel, M.). 239–256. https://doi.org/10.1007/978-0-387-77101-4_12 (Springer Budelmann, B.-U. Morphological diversity of equilibrium receptor systems in aquatic invertebrates. In Sensory Biology of Aquatic Animals (eds. Atema, J., Fay, R. R., Popper, A. N. & Tavolga, W. N.). 757–782 https://doi.org/10.1007/978-1-4612-3714-3_30 (Springer Structure of recent and fossil mysid statoliths (Crustacea Comparative morphology of crayfish mandibles Klompmaker, A., Kloess, P., Jauvion, C., Brezina, J. & Landman, N. Internal anatomy of a brachyuran crab from a Late Cretaceous methane seep and an overview of internal soft tissues in fossil decapod crustaceans. Palaeontol. Electron. https://doi.org/10.26879/1277 (2023) Exceptional preservation of internal organs in a new fossil species of freshwater shrimp (Caridea: Palaemonoidea) from the Eocene of Messel (Germany) The first shrimp preserved in mid-cretaceous Kachin amber: Systematics The crustacean cuticle does not record chronological age: New evidence from the gastric mill ossicles and nutrient absorption in decapod crustaceans: A comparison to the mammalian model of digestion Morphology of gastric mills and mandibles of New Guinean parastacid crayfishes with comparisons with other Astacidea (Decapoda) a class of fossil crustaceans: relationships to Malacostraca and postulated behaviour Functional cytology of the hepatopancreas of decapod crustaceans Gonad development of the deep-sea lobster Polycheles typhlops (Decapoda: Polichelidae) from the Central Western Mediterranean Ageing and longevity in the Decapoda (Crustacea): A review Waddy, S. L., Aiken, D. E. & Kleijn, D. P. V. D. Chapter 10—Control of growth and reproduction. In Biology of the Lobster (ed. Factor, J. R.). 217–266 https://doi.org/10.1016/B978-012247570-2/50032-3 (Academic Press A review of exceptional preservation in fossil ostracods (Ostracoda Ovarian maturation of Penaeus subtilis (Decapoda: Penaeidae): A new insight to describe oocyte development and somatic structures Mclay, C. L. & van den Brink, A. Crayfish growth and reproduction. In Biology and Ecology of Crayfish (eds. Longshaw, M. & Stebbing, P.). 62–116 https://doi.org/10.1201/b20073-4 (CRC Press The eastern swamp crayfish Gramastacus lacus sp Parastacidae) a new species of freshwater crayfish from coastal New South Wales Egg production and life-history strategies in some clawed and spiny lobster populations Decapod phylogeny: Addition of fossil evidence to a robust morphological cladistic data set Exceptionally preserved crustaceans from the Oxfordian of eastern France (Terrain à Chailles Formation Review of the Late Jurassic erymoid lobsters (Crustacea: Decapoda) The PyHST2 hybrid distributed code for high speed tomographic reconstruction with iterative reconstruction and a priori knowledge capabilities NIH image to ImageJ: 25 years of image analysis 3D Slicer as an image computing platform for the quantitative imaging network strap: An R package for plotting phylogenies against stratigraphy and assessing their stratigraphic congruence and opportunism in the evolutionary radiation of dinosaurs Download references Computed tomography scanning of Eryma was performed at the Synchrotron Soleil (PSICHÉ beamline) at Gif-sur-Yvette (France) Centre de Recherche en Paléontologie-Paris Thomas Laville & Nathalie Poulet-Crovisier Department of Earth and Planetary Sciences The authors declare no competing interests Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations Download citation DOI: https://doi.org/10.1038/s41598-024-67357-3 Anyone you share the following link with will be able to read this content: a shareable link is not currently available for this article Sign up for the Nature Briefing newsletter — what matters in science Paleontologists have identified a new genus and species of vampyromorph coleoid from a fossil specimen found in the Middle Jurassic La Voulte-sur-Rhône Lagerstätte Hypothesized reconstruction of Vampyrofugiens atramentum The vampire squid (Vampyroteuthis infernalis) is the only living species of the cephalopod order Vampyromorphida Named for their blue eyes reddish-brown skin and webbing between their eight arms these creatures are not technically true squids They combine features from both octopuses and squids and likely represent an ancestral line between the two groups The newly-described vampyromorph species lived during the Middle Jurassic period and an octopus-type arm configuration and musculature “The combination of the ink sac and internal luminous organs is known from the recent times, although not from the coleoid (octopuses squid and cuttlefish) fossil record,” said Sorbonne Université paleontologist Alison Rowe and colleagues The specimen of Vampyrofugiens atramentum showing the 3D preservation of the mineralized soft tissue Vampyrofugiens atramentum had a pelagic lifestyle in the La Voulte-sur-Rhône setting The mosaic of characters in this species highlight that it used both predatory and defensive strategies with a combination of defense mechanisms so far unknown from the fossil record The presence of an ink sac indicates that Vampyrofugiens atramentum was likely to be prey to contemporaneous predators and used concealment as a tool for evasion Its photophores suggest that it used bioluminescence as a form of obfuscation and communication The configuration of the arms and suckers in Vampyrofugiens atramentum in conjunction with the sensory functionality of the cirri suggests that it used both to detect and capture prey “It is likely that the manipulation strategies used by Vampyrofugiens atramentum were similar to those seen in living octopuses given that the internal arm musculature mirrors that present in the extant eight-armed group,” the researchers said “This is the first evidence of this type of arm musculature preserved in Jurassic forms.” The fossilized remains of Vampyrofugiens atramentum were found at the locality of La Voulte-sur-Rhône in Ardèche, France, and were preliminarily assigned to a previously known species, Vampyronassa rhodanica The study authors examined the fossil using high resolution X-ray-based imaging and reflectance transformation imaging “The addition of this new vampyromorph species not only increases the coleoid diversity known from the site but also broadens the morphological variation observed in the co-occurring coleoid species,” they concluded “The findings suggest that there was a high diversity of cephalopods occupying differentiated communities during the Middle Jurassic.” The team’s paper was published in the journal Papers in Palaeontology A new vampyromorph species from the Middle Jurassic La Voulte-sur-Rhône Lagerstätte Papers in Palaeontology 9 (3): e1511; doi: 10.1002/spp2.1511 Sea spiders are an enigmatic class of living arthropods They are morpho-anatomically unique among arthropods this has led to their interpretation as the sister group of all other living arthropods but scientists have known a few from different periods A new study reports that an extremely rare collection of 160-million-year-old sea spider fossils from Southern France are closely related to living species To comprehend the evolution of marine spiders the diversity of marine spiders that is still present has already begun to form Lead author Dr. Romain Sabroux from the University of Bristol‘s School of Earth Sciences said: “The fossils are very interesting to understand the evolution of arthropods [the group that includes insects centipedes and millipedes] as they appeared relatively early in the arthropod tree of life That’s why we are interested in their evolution.” is the one of La Voulte-sur-Rhône that dates back to the Jurassic are morphologically similar to current species (albeit not identical) and earlier research suggested they might be closely connected to living sea spider families The limitations of their observational methods As it was impossible to access what was hidden in the rock fossils scientists went to Paris and investigated this question with cutting-edge approaches They mainly used two methods: X-ray microtomography and Reflectance Transformation Imaging X-ray microtomography shows what’s inside the rock scientists reconstructed a 3D model of the fossilized specimen Reflection Transformation Imaging is a picture-taking technique that depends on changing the direction of the light around the fossil to make hidden characteristics on its surface more visible Sabroux said, “From these new insights we drew new morphological information to compare them with extant species.” This demonstrated the close kinship between these fossils and living pycnogonids Colossopantopodus boissinensis and Palaeoendeis elmii are members of Colossendeidae and Endeidae appears to be a member of an extinct family Dr. Sabroux added by calculating the difference between the DNA sequences of a sample of species and using DNA evolution models we can estimate the timing of the evolution that binds these species together.” “This is what we call a molecular clock analysis We must tell the clock: ‘We know that at that time that group was already there.’ Thanks to our work we now know that Colossendeidae and Endeidae were already’ there’ by the Jurassic.” The team may now examine the timeline of Pycnogonida evolution using these minimum ages as calibrations for the molecular clock. For instance, they will be better able to comprehend how the various biodiversity crises throughout Earth’s history have affected their diversity They also have plans to look at additional pycnogonid fossil faunas like the 400 million-year-old Devonian fauna found in Germany’s Hunsrück Slate © 2025 All Rights Reserved, Tech Explorist® The fossils used in the study included exceptionally preserved soft tissue structures The yellow highlighted structure is the part of the sucker used for adhesion The cephalopod likely hunted in the open ocean A Jurassic vampire squid-like creature used supersuckers to snatch prey out of the water column and lock it in place with a watertight seal we can show that there was a combination of anatomical characters in V rhodanica not seen today," first author Alison Rowe a doctoral student at the Palaeontology Research Center in Paris (CR2P) the French National Centre for Scientific Research and the National Museum of Natural History in Paris The three fossils featured in the study were originally excavated from La Voulte-sur-Rhône Lagerstätte an exceptional fossil site located in the Ardèche region of southeastern France meaning it dates to the middle of the Jurassic period (201.3 million to 145.5 million years ago) and it contains a trove of different fossilized marine organisms Related: 500 million-year-old fossil is the granddaddy of all cephalopods  "The La Voulte-sur-Rhône Lagerstätte in France is really special as it preserves specimens in 3D," Rowe said the flesh was replaced with iron-rich minerals over time It's unusual to find fossilized cephalopods with any remnants of soft tissue rhodanica fossils from La Voulte-sur-Rhône are a rare find.  octopus-like creature with eight arms as well as suckers and spiky appendages called cirri it was clear that each arm bore one row of suckers flanked by cirri on both sides But the exact structure of these features was difficult to discern Get the world’s most fascinating discoveries delivered straight to your inbox "I guess a crude comparison would be if you're used to looking at skeletons and you suddenly have a mummy — it gives you a ton of extra detail but looking at the surface of it isn't going to immediately tell you much about the internal anatomy," said Christopher Whalen a National Science Foundation postdoctoral fellow of paleontology co-hosted at Yale University and the American Museum of Natural History the preserved soft tissues somewhat obscure the hard structures beneath By reexamining the fossils with powerful X-rays the study authors provided "incredibly useful" insight into the animals' innards Related: Ancient 10-armed vampire squid relative named for Joe Biden the X-ray analyses allowed the team to reconstruct the cephalopods' suckers in high resolution such that they could "virtually dissect" the suckers on-screen These suckers are similar in shape to those of vampire squid although they differ in that they're larger rhodanica also carries a slightly different configuration of suckers and cirri on two of its arms which measure slightly longer than its other six arms.  the study authors theorized that the animal likely hunted prey in the open ocean and used its large suckers and specialized arms to capture and manipulate its victims —We finally know how trilobites mated, thanks to new fossils —'Mind-boggling' scrambled genome found in octopus and squid. It could explain their smarts. —10 coolest non-dinosaur fossils unearthed in 2021  "It seems reasonable to me to say that this animal was predatory," Whalen said This sets the Jurassic cephalopod apart from vampire squid since the modern animals don't hunt and instead feed on tiny organisms and bits of organic material that drift down to the deep sea from shallower layers of the ocean sticky structures called filaments to pluck their food from the water column but the authors didn't find evidence of these filaments in V It may be that the Jurassic animals truly lacked these structures or it could be that they're just missing from the specimens examined A true lack of filaments could hint that V rhodanica is actually more closely related to modern octopuses than to vampire squids since octopuses also lack filaments — but for now Originally published on Live Science.  Nicoletta LaneseSocial Links NavigationChannel Editor HealthNicoletta Lanese is the health channel editor at Live Science and was previously a news editor and staff writer at the site She holds a graduate certificate in science communication from UC Santa Cruz and degrees in neuroscience and dance from the University of Florida she also remains heavily involved in dance and performs in local choreographers' work Dinosaurs might still roam Earth if it weren't for the asteroid rex researchers eviscerate 'misleading' dinosaur leather announcement Bone collector caterpillar: The very hungry caterpillar of your nightmares Metrics details Crustacean eggs are rare in the fossil record Here we report the exquisite preservation of a fossil polychelidan embedded within an unbroken nodule from the Middle Jurassic La Voulte-sur-Rhône Lagerstätte (France) and found with hundreds of eggs attached to the pleon and offers unique clues to discuss the evolution of brooding behaviour in polychelidan lobsters which now relies on a long-lived planktic larval stage that probably did not exist in the early evolutionary steps of the group the brood size of polychelidan lobsters seems to have remained unchanged and comparatively small since the Jurassic This finding is at odds with reproductive strategies in other lobster groups in which a long-lived planktic larval stage is associated with a large brood size polychelidan lobsters and others) is a group of decapod crustaceans characterised by a specific reproductive strategy in which females brood their eggs on their abdominal appendages instead of releasing them directly into the ocean Comparative brood and development strategies in some extant lobsters (Decapoda). (A) Achelata Scholtz & Richer, 1995, eggs, phyllosoma (by C. Jauvion after Haeckel 1899), adult (by D. Audo); (B) Astacidea Latreille, 1802, eggs, third zoea (by C. Jauvion after Herrick 1911), adult (by D. Audo); (C) Polychelida Scholtz & Richer, 1995, eggs, eryoneicus (by C. Jauvion after Bouvier 1917), adult (by C. Jauvion after Hickson 1893). Modern ovigerous polychelidan lobsters; (A,B) Stereomastis auriculata (Bate MNHN-IU-2016-9911; (A) dorsal view; (B) ventral view 553 distinguishable eggs in this photograph; (C,D) Polycheles enthrix (Bate MNHN-IU-2018-4209: (C) dorsal view; (D) ventral view 389 distinguishable eggs in this photograph the number and size of eggs of Jurassic polychelidan lobsters was unknown making it difficult to evaluate if the emergence of the eryoneicus larvae was accompanied by a change in fecundity Here, we report the discovery of a unique specimen of polychelidan exquisitely preserved with its eggs within an unbroken nodule from the Middle Jurassic La Voulte-sur-Rhône Lagerstätte, France (Fig. 3). MNHN.F.A58254; (A) unbroken nodule showing arms of brittle stars; (B–F) 3D model; (B) nodule with the specimen and associated brittle stars visible; (C) dorsal view; (D) ventral view; (E) left lateral view; (F) left lateral view Modern eggs and spermatheca from polychelidans (A,B) and comparison with Jurassic Palaeopolycheles nantosueltae (C,D); (A) modern polychelidan eggs MNHN-IU-2018–4214; (C) close-up of preserved eggs; (D) close-up of preserved spermatheca; (E) Egg size and shield length of modern Polychelida and of Palaeopolycheles nantosueltae The egg size is not statistically different from that of MNHN-IU-2008-10470 (Stereomastis helleri; Wilcoxon-Mann-Whitney test Scale bars: 5 mm in A and C; 2 mm in B and D – The specific epithet is referring to Nantosuelta a Celtic goddess associated with fertility alluding to the ovigerous state of the holotype Palaeopolycheles nantosueltae differs from the only other known species by its shorter antennular peduncle reaching less than half the length of the scaphocerite (almost as long as the scaphocerite in P longipes) and less curved cervical groove (more curved in P added to the stratigraphic gap (Callovian-Kimmeridgian) separating both species due to a lower dispersion and higher food availability in this environment compared to the open ocean Comparisons were made with extant specimens housed in the zoological collections of the Muséum national d’Histoire naturelle (acronym: MNHN-IU) and to fossil specimens of Palaeopolycheles longipes (Fraas, 1855; Fig. S4) housed in the Staatliches Museum für Naturkunde The new database of egg size in modern polychelidan lobsters was generated for comparison from the MNHN collections 10 egg diameters were measured per specimen (photograph) using ImageJ Statistical difference between each extant specimen and MNHN.F.A58254 were tested using a Wilcoxon-Mann-Whitney test For microtomography, we used the same method as described in Jauvion et al.2 The unbroken nodule was imaged with a v│tome│× 240 L tomograph (GE Sensing & Inspection Technologies Phoenix ×│ray) equipped with a microfocus 240 kV/320 W tube delivering a current/voltage of 220 mA/120 kV Microtomography was performed at the AST-RX technical platform of the MNHN Data were processed to obtain a series of virtual slices with a voxel size (cubic voxel) of 31.4 mm Virtual slices were saved as a series of image files in 16 bits greyscale indicating differences in absorption of X-ray within the nodule (darker for low absorption 1900 virtual slices with a resolution of 1340 × 1198 pixels were thus obtained Outlines of the fossilized structure were segmented using Mimics 20.0 (Materialise) for 3D reconstruction Rare fossil polychelid lobsters in turbiditic palaeoenvironments Virtual dissection and lifestyle of a 165 million-year-old female polychelidan lobster High biodiversity in Polychelida crustaceans from the Jurassic La Voulte-sur-Rhône Lagerstätte Palaeoecology of Voulteryon parvulus (Eucrustacea Polychelida) from the Middle Jurassic of La Voulte-sur-Rhône Fossil-Lagerstätte (France) a new genus of widespread early Toarcian polychelidan lobsters Unique occurrence of polychelidan lobster larvae in the fossil record and its evolutionary implications Larval development of fossil polychelidan crustaceans exemplified by the 150 million years old species Palaeopentacheles roettenbacheri Middle Jurassic Monte Fallano Plattenkalk (Campania southern Italy): first report on terrestrial plants Waptia and the Diversification of Brood Care in Early Arthropods Spinicaudatans and ostracods (Crustacea) from the Montceau lagerstätte (Late Carboniferous France): Morphology and Palaeoenvironmental significance Exceptionally preserved 450-million-year-old ordovician ostracods with brood care Syncarid crustaceans from the Montceau lagerstatte (Upper Carboniferous; France) Découverte d’une faune d’ostracodes dans la Formation d’Abbé (Permien basal Evidence of brooding in Permian non-marine Ostracoda A 365-million-year-old freshwater community reveals morphological and ecological stasis in branchiopod crustaceans The La Voulte-sur-Rhône Lagerstätte (Middle Jurassic Diversity and palaeoecology of the enigmatic genus Knebelia (Eucrustacea Eryonidae) from Upper Jurassic plattenkalks in southern Germany Review: Diverse larval recruitment strategies within the Scyllaridae The oldest higher true crabs (Crustacea: Decapoda: Brachyura): Insights from the Early Cretaceous of the Americas The influence of reefs on the rise of Mesozoic marine crustaceans Crustacea Decapoda: review of the genera and species of the family Polychelidae Wood-Mason Mémoires du Muséum National d’Histoire Naturelle (Paris) Jauvion, C. et al. Exceptional preservation requires fast biodegradation: thylacocephalan specimens from La Voulte-sur-Rhône (Callovian, Jurassic, France). Palaeontology 1–19, https://doi.org/10.1111/pala.12456 (2019) Data from: A new polychelidan lobster preserved with its eggs in a 165 Ma nodule https://doi.org/10.5281/zenodo.3624687#.XihfBcw1OpQ.mendeley Download references The authors would like to acknowledge Maïté Adam and Patricia Wils (AST-RX plateau d’Accès Scientifique à la Tomographie à Rayons X du MNHN UMS 2700 Outils et méthodes de la systématique intégrative CNRS-MNHN Paris) for X-Ray acquisition and pre-treatment and Florent Goussard (MNHN UMR 7207 CR2P) for technical assistance with data reconstruction We thank Günter Schweigert (SMNS) for access to specimens Lilian Cazes (MNHN) and Peter Massicard (projet e-recolnat ANR-11-INBS-0004-RECOLNAT) provided photographs of specimens DA research was supported by the China Postdoctoral Science Foundation Yunnan Province Postdoctoral Science Foundation and Yunnan Provincial Research Grants 2018FA025 and 2018IA073 SB and SC benefitted from two MNHN grants: ATM Crevoulte (MNHN) and PerSysT (Origin and Evolution Department) Schweitzer and an anonymous reviewer for their constructive reviews Centre de Recherche en Paléontologie - Paris de Physique des Matériaux et de Cosmochimie MEC International Joint Laboratory for Palaeobiology and Palaeoenvironment managed the specimen scanning procedure and 3D reconstructions composed the figures and drafted the manuscript provided pictures of Palaeopolycheles longipes and critically revised the manuscript coordinated the study and critically revised the manuscript All authors gave final approval for publication and agree to be held accountable for the work performed therein Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations Download citation DOI: https://doi.org/10.1038/s41598-020-60282-1 By James Randerson A PLANT dubbed the suicide tree kills many more people in Indian communities than was previously thought The warning comes from forensic toxicologists in India and France who have conducted a review of deaths caused by plant-derived poisons which grows across India and south-east Asia is used by more people to commit suicide than any other plant pathologists and coroners are failing to detect how often it is used to murder people A team led by Yvan Gaillard of the Laboratory of Analytical Toxicology in La Voulte-sur-Rhône