Morphology and anatomy of the Late Jurassic<i>Mayrocaris bucculata</i>(Eucrustacea?, Thylacocephala) with comments on the tagmosis of Thylacocephala

Laville, Thomas; Haug, Carolin; Haug, Joachim T.; Forel, Marie‐Béatrice; Charbonnier, Sylvain

doi:10.1080/14772019.2021.1910584

Cited by 3 publications

(12 citation statements)

References 82 publications

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“…Scales: A-C, 10 mm; D, G, 2 mm; E, 5 mm; F, 1 mm. ginal fold (Laville et al, 2021a(Laville et al, , 2021b This structure, although often reported, has never been described in detail. In our CT-scans, we can clearly describe its morphology in Concavicaris woodfordi: it represents an inner folding of the shield (Figure 3).…”

Section: Shieldmentioning

confidence: 96%

“…Measurements. We followed the scheme of measurements from Laville et al (2021a). Measurements were done on the macro-photographs of the specimen using ImageJ2 (Schneider et al, 2012).…”

Section: Specimenmentioning

confidence: 99%

“…In many species, large rounded spots located in the anterior or central part of the shield have been described as putative muscle scars. (Secrétan and Riou, 1983;Pinna et al, 1985;Secrétan, 1985;Charbonnier et al, 2017Charbonnier et al, , 2019Laville et al, 2021a). Moreover, those muscle scars can be associated with muscles, as for Ostenocaris cypriformis Arduini, Pinna and Teruzzi, 1980 from the Early Jurassic of Italy (Arduini et al, 1980;Pinna et al, 1985).…”

Section: Musclesmentioning

confidence: 99%

“…There are several major questions surrounding the character and mode of tagmatization in Thylacocephala (e.g., Polz, 1993). Multiple hypotheses have been made concerning this topic (see Laville et al, 2021a for a review); the main differences between them center on four major aspects: 1) the origin of the shield, 2) the number and nature of cephalic and posterior trunk appendages, 3) the nature of raptorial appendages, and 4) the insertion of gills.…”

Section: Tagmatizationmentioning

confidence: 99%

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New look at Concavicaris woodfordi (Euarthropoda: Pancrustacea?) using micro-computed tomography

Laville

Hegna

Forel

et al. 2023

Palaeontol Electron

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Known from at least the Silurian to the Cretaceous, Thylacocephala is an enigmatic fossil euarthropod ingroup, often allied with Pancrustacea. Previous studies show that thylacocephalans are characterized by a folded protective shield, hypertrophied compound eyes, three pairs of raptorial appendages, a posterior trunk comprised of eight to 22 segments bearing appendages, and eight pairs of gills. Despite this knowledge of their anatomy, many questions remain, especially surrounding the anatomy of Paleozoic representatives.The Upper Devonian Woodford Shale (upper Famennian, Oklahoma, USA) has yielded several fossil euarthropods, including two species of Thylacocephala: Concavicaris elytroides and Concavicaris woodfordi. Here, we use micro-computed Xray tomography to re-explore the anatomy of the holotype of C. woodfordi, illustrating fine details of the shield structure, of the circulatory, digestive and reproductive systems, and of the appendages. A marginal fold of the shield as well as an inner layer are described for the first time in a thylacocephalan. Concavicaris woodfordi shares similarities with Concavicaris submarinus, another Famennian species, including the morphology of the shield and the internal anatomy. It also displays a similar organisation as Mesozoic taxa, such as Dollocaris ingens. All of this provides important information that will be crucial to reconstruct the evolution and the affinities of Thylacocephala.

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Section: Shieldmentioning

confidence: 96%

“…Measurements. We followed the scheme of measurements from Laville et al (2021a). Measurements were done on the macro-photographs of the specimen using ImageJ2 (Schneider et al, 2012).…”

Section: Specimenmentioning

confidence: 99%

Section: Musclesmentioning

confidence: 99%

Section: Tagmatizationmentioning

confidence: 99%

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New look at Concavicaris woodfordi (Euarthropoda: Pancrustacea?) using micro-computed tomography

Laville

Hegna

Forel

et al. 2023

Palaeontol Electron

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“…For instance, the organisation of the digestive, respiratory and visual systems has been reported for Dollocaris ingens Secrétan, 1985 (La Voulte Lagerstätte;Vannier et al 2016). Moreover, cephalic appendages have been described from Solnhofen representatives of Clausocaris lithographica (Oppenheim, 1888) (see Laville et al 2021a) and Mayrocaris bucculata Polz, 1994 (see Haug et al 2014). These anatomical details are important for resolving the phylogenetic affinities of Thylacocephala (e.g., Haug et al 2014;Vannier et al 2016;Broda & Zatoń 2017).…”

Section: Introductionmentioning

confidence: 99%

Re-appraisal of thylacocephalans (Euarthropoda, Thylacocephala) from the Jurassic La Voulte-sur-Rhône Lagerstätte

Laville,

Forel,

Charbonnier

2023

EJT

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Thylacocephalans are enigmatic euarthropods, known at least from the Silurian to the Cretaceous. Despite remaining uncertainties concerning their anatomy, key features can be recognised such as a shield enveloping most of the body, hypertrophied compound eyes, three pairs of raptorial appendages and a posterior trunk consisting of eight up to 22 segments bearing appendages and eight pairs of gills. Well-known for its euarthropod diversity, the La Voulte-sur-Rhône Lagerstätte (Callovian, Middle Jurassic, France) has provided many remains of four thylacocephalan species so far: Dollocaris ingens, Kilianicaris lerichei, Paraostenia voultensis and Clausocaris ribeti. In this paper, we study the type material as well as undescribed material. The re-description of La Voulte thylacocephalans reveals an unexpected diversity, with the description of two new species, Austriocaris secretanae sp. nov. and Paraclausocaris harpa gen. et sp. nov., and of specimens of Mayrocaris, a taxon originally described from Solnhofen Lagerstätten. We also reassign Clausocaris ribeti to Ostenocaris. The reappraisal of La Voulte thylacocephalans also provides important insight into the palaeobiology of Thylacocephala. New key anatomical features are described, such as an oval structure or a putative statocyst, which indicate a nektonic or nektobenthic lifestyle. Finally, we document a juvenile stage for Paraostenia voultensis.

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Description ofAcheronautagen. nov., a possible mandibulate from the Silurian Waukesha Lagerstätte, Wisconsin, USA

Pulsipher

Anderson

Wright

et al. 2022

Journal of Systematic Palaeontology

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Morphology and anatomy of the Late JurassicMayrocaris bucculata(Eucrustacea?, Thylacocephala) with comments on the tagmosis of Thylacocephala

Cited by 3 publications

References 82 publications

New look at Concavicaris woodfordi (Euarthropoda: Pancrustacea?) using micro-computed tomography

New look at Concavicaris woodfordi (Euarthropoda: Pancrustacea?) using micro-computed tomography

Re-appraisal of thylacocephalans (Euarthropoda, Thylacocephala) from the Jurassic La Voulte-sur-Rhône Lagerstätte

Description ofAcheronautagen. nov., a possible mandibulate from the Silurian Waukesha Lagerstätte, Wisconsin, USA

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