Tomographic reconstruction of the exceptionally preserved trigonotarbid arachnid Eophrynus prestvicii

Dunlop, Jason A.; Garwood, Russell J.

doi:10.4202/app.2012.0032

Cited by 7 publications

(13 citation statements)

References 44 publications

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“…Remarks.-The new fossil belongs to the family Eophrynidae. This is evident from, among other characters (see Dunlop & Garwood, 2014), the heavily ornamented dorsal opisthosoma with both a pattern of discrete dorsal tubercles and a series of posterior spines. Eight eophrynid genera are currently recognized in the literature and the known patterns of large opisthosomal dorsal tubercles are summarized for the most complete species in Fig.…”

Section: Systematic Paleontologymentioning

confidence: 86%

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A trigonotarbid arachnid from the Pennsylvanian Astrasado Formation of the Kinney Brick Quarry, New Mexico

Dunlop

Wang²,

Selden

et al. 2014

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Abstract.-A new eophrynid trigonotarbid (Arachnida: Trigonotarbida: Eophrynidae) from the Pennsylvanian (Kasimovian) Astrasado Formation of the Kinney Brick Quarry, New Mexico is described. This fossil -the first arachnid to be recorded from the Astrasado Formation -is preserved primarily as a dorsal opisthosoma. Pleophrynus hawesi sp. nov. diagnostically preserves evidence for three pairs of posterior opisthosomal spines rather than the two usually seen in other eophrynids. A comparison of opisthosomal tuberculation patterns among the best known eophrynid species is included. At ca. 304.0-306.5 Ma, our new taxon represents one of the youngest records of Eophrynidae, while the Kinney Brick Quarry is only the twelfth site in North America to yield trigonotarbid arachnids; compared to more than 60 such localities in Europe.

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Section: Systematic Paleontologymentioning

confidence: 86%

“…Anterior margin of the carapace drawn out into a long spine. Dorsal surface densely tuberculated, ventral surface sparsely tuberculated (after Dunlop & Garwood, 2014).…”

Section: Systematic Paleontologymentioning

confidence: 99%

A trigonotarbid arachnid from the Pennsylvanian Astrasado Formation of the Kinney Brick Quarry, New Mexico

Dunlop

Wang²,

Selden

et al. 2014

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show abstract

“…). A strong trend towards the development of heavy, probably defensive, tuberculation and later spination in the eophrynid assemblage is apparent during the Carboniferous (Dunlop & Garwood, ). The changes in both lineages could have resulted from an increasing risk of predation for trigonotarbids by tetrapods, which diversified prolifically during the Carboniferous (Coates, Ruta & Friedman, ).…”

Section: Discussionmentioning

confidence: 99%

“…For this novel analysis morphological character statements were derived from both the literature and direct observation of trigonotarbid taxa in the form of virtual fossils of Anthracomartus hindi and Maiocercus celticus (Garwood & Dunlop, ), Eophrynus prestvicii (Dunlop & Garwood, ), and the model of Tr. johnsoni presented herein.…”

Section: Methodsmentioning

confidence: 99%

“…Furthermore, it represents a well‐preserved species superficially similar in appearance to the earliest known but poorly preserved trigonotarbid Palaeotarbus jerami , and is not an overt member of either the eophrynid assemblage nor the Palaeocharinus /anthracomartid group. Indeed, both of these groupings have been recently restudied with the aid of X‐ray microtomography (micro‐CT; Garwood, Dunlop & Sutton, ; Garwood & Dunlop, ; Dunlop & Garwood, ). For this reason we included a redescription of Tr.…”

Section: Previous Workmentioning

confidence: 99%

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Trigonotarbus johnsoni Pocock, 1911, revealed by X-ray computed tomography, with a cladistic analysis of the extinct trigonotarbid arachnids

et al. 2014

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Trigonotarbids are a group of Palaeozoic arachnids, best known from Coal Measures sites in Europe and North America. Here, we review previous work on their higher systematics and redescribe Trigonotarbus johnsoni Pocock, 1911, from the Coseley Lagerstätte, UK, on the basis of both hand specimens and X-ray microtomography reconstruction. This is a historically important species -being the eponymous taxon for the entire order -but lacks recent or comprehensive description. We also present the first cladistic analysis of Trigonotarbida, based on a novel matrix of 49 characters, 20 trigonotarbids, and four outgroups. Two families, Archaeomartidae and Lissomartidae, were only represented by a single exemplar. At least two exemplars were scored to test monophyly for other families. Anthracomartidae, Anthracosironidae, and Eophrynidae were all recovered as monophyletic, but Palaeocharinidae, Trigonotarbidae, Aphantomartidae, and Kreischeriidae were not. In a wider context, our data support a (Trigonotarbida + Ricinulei) clade; albeit based on a limited set of outgroups. Relationships within Trigonotarbida were not so well resolved, although two previously anticipated clades were consistently recovered in the agreement subtrees with strong support: (1) (Palaeocharinus (Archaeomartidae + Anthracomartidae)) and (2) Lissomartus as sister group to a so-called 'eophrynid assemblage' (Aphantomartus (Alkenia (Pseudokreischeria (Kreischeria (Eophrynus + Pleophrynus))))).

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A remarkable spiny arachnid from the Pennsylvanian Mazon Creek Lagerstätte, Illinois

Selden,

Dunlop

2024

J. Paleontol.

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A new genus and species of arachnid (Chelicerata: Arachnida), Douglassarachne acanthopoda n. gen. n. sp., is described from the late Carboniferous (Moscovian) Coal Measures of the Mazon Creek Lagerstätte, Illinois, USA. This is a unique animal with distinctive large spines on the legs. It has a subovate body, a segmented opisthosoma, and a terminal anal tubercle. The legs are robust and appear to have been similar in construction throughout the limb series, with heavy spination of the preserved proximal podomeres. The mouthparts and coxo-sternal region are equivocal. The preserved character combination does not permit easy referral to any known arachnid order, living or extinct, thus the new fossil in placed as Arachnida/Pantetrapulmonata incertae sedis. It contributes to an emerging pattern of disparate body plans among late Carboniferous arachnids, ranging from anatomically modern members of living orders through to extinct taxa, such as the present fossil, whose phylogenetic position remains unresolved. UUID: http://zoobank.org/b70f5f95-9c8b-4389-bee5-b6031bff2ee2

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Tomographic reconstruction of the exceptionally preserved trigonotarbid arachnid Eophrynus prestvicii

Cited by 7 publications

References 44 publications

A trigonotarbid arachnid from the Pennsylvanian Astrasado Formation of the Kinney Brick Quarry, New Mexico

A trigonotarbid arachnid from the Pennsylvanian Astrasado Formation of the Kinney Brick Quarry, New Mexico

Trigonotarbus johnsoni Pocock, 1911, revealed by X-ray computed tomography, with a cladistic analysis of the extinct trigonotarbid arachnids

A remarkable spiny arachnid from the Pennsylvanian Mazon Creek Lagerstätte, Illinois

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