Redescription of the cheloniellid euarthropod Triopus draboviensis from the Upper Ordovician of Bohemia, with comments on the affinities of Parioscorpio venator

  title={Redescription of the cheloniellid euarthropod Triopus draboviensis from the Upper Ordovician of Bohemia, with comments on the affinities of Parioscorpio venator},
  author={Peter Van Roy and Štěp{\'a}n Rak and Petr Budil and Oldřich Fatka},
  journal={Geological Magazine},
  pages={1471 - 1489}
Abstract Cheloniellida is a rare but significant clade of artiopod euarthropods, and a major component of Vicissicaudata alongside aglaspidids. The first cheloniellid to be described was Triopus draboviensis, based on a single specimen from the Upper Ordovician Letná Formation in Bohemia. Because this specimen was believed to be missing its anterior, Triopus draboviensis has been the subject of considerable speculation regarding its affinities, with several authors combining various isolated… 

Description of Acheronauta gen. nov., a possible mandibulate from the Silurian Waukesha Lagerstätte, Wisconsin, USA

Examination of numerous specimens of a previously unnamed and undescribed vermiform arthropod that bears a cephalic carapace, a suite of specialized head appendages, a long, segmented trunk, and a battery of small swimming appendages establishes it as a novel genus and species.

The Late Ordovician Tafilalt Biota, Anti-Atlas, Morocco: a high-latitude perspective on the GOBE

Abstract The extensive, predominantly siliciclastic deposits of the Upper Ordovician of the Tafilalt have long been the subject of scientific investigation. In the past 25 years, intensified



Trilobite and xiphosuran affinities for putative aglaspidid arthropods Caryon and Drabovaspis, Upper Ordovician, Czech Republic

Almost all arthropods that have been allied to this Order share a similar morphology, including a semicircular and convex cephalon devoid of facial sutures and a faint glabellar region.

An aglaspidid arthropod from the Upper Ordovician of Morocco with remarks on the affinities and limitations of Aglaspidida

  • P. Roy
  • Environmental Science
    Transactions of the Royal Society of Edinburgh: Earth Sciences
  • 2005
A new aglaspidid arthropod is described from the Pusgillian (lower Ashgill, Upper Ordovician) Upper Tiouririne Formation near Erfoud, southeastern Morocco and it is suggested that ag laspidids are probably more closely related to trilobites than they are to chelicerates.

Upper Ordovician Thylacocephala (Euarthropoda, Eucrustacea) from Bohemia indicate early ecological differentiation

Even though the newly described taxa represent the oldest unequivocal thylacocephalans, their carapaces display several characters most similar to those of Mesozoic groups, whether these similarities reflect true close relationships and Ordovician origins for these groups or are only the result of convergent evolution is uncertain.

A Revision of the Late Ordovician Marrellomorph Arthropod Furca bohemica from Czech Republic

The enigmatic marrellomorph arthropod Furca bohemica from the Upper Ordovician Letná Formation, is redescribed. Based on existing museum specimens and new material collected from the southern slope

Burlingiid trilobites from Norway, with a discussion of their affinities and relationships

Cladistic analysis supports the genera Burlingia and Schmalenseeia as currently understood, and suggests that Schmalineeia was derived from a broadly Burlingiid–like ancestor, with S. acutangula displaying how the transition may have occurred.

The early history and phylogeny of the chelicerates

When fossil taxa are considered, the limits of the Chelicerata become less well constrained, especially true of various problematic arthropods: fossils such as aglaspidids, chasmataspids, Sanctacaris Briggs and Collins, 1988 and other Burgess Shale-type arthropODs.

An early Cambrian chelicerate from the Emu Bay Shale, South Australia

The morphology of this taxon shares many overall body features with Sanctacaris, and some with Sidneyia, particularly its gnathobasic complex, and these chelicerate affinities are corroborated by phylogenetic analyses.

The phylogeny of arachnomorph arthropods and the origin of the Chelicerata

The present study provides a detailed discussion of primary hypotheses of homology and includes a more complete range of terminal taxa than previous analyses, and provides the first convincing synapomorphies for the Arachnomorpha.

A new aglaspidid-like euarthropod from the lower Cambrian Emu Bay Shale of South Australia

A new euarthropod from the Emu Bay Shale (Cambrian Series 2, Stage 4) on Kangaroo Island, South Australia, is a rare component of this Konservat-Lagerstätte and supports close affinities to either Emeraldella or to aglaspidids, but several plesiomorphic character states are inconsistent with membership in Aglaspids sensu stricto.

The Vicissicaudata revisited – insights from a new aglaspidid arthropod with caudal appendages from the Furongian of China

A new comprehensive phylogenetic analysis provides strong support for the legitimacy of a monophyletic clade Vicissicaudata, and demonstrates the pertinence of new characters to define Aglaspidida.