Weinbergina, a xiphosuran arthropod from the devonian hunsrück slate

Stürmer, Wilhelm; Bergström, Johan

doi:10.1007/bf02988142

Cited by 52 publications

(37 citation statements)

References 13 publications

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“…The character has been coded absent for Kuamaia , where the axis in the fossils is defined by compactional folds as in Arthroaspis . The axis of Weinbergina is defined by nodes rather than furrows as is best seen in the non-lateral compressed specimens (figure 6a in [83]). Coded inapplicable for Pycnogonida which does not have a trunk.…”

Section: Methodsmentioning

confidence: 99%

“…Articulating ridges are present in Cheloniellon (figure 12a in [62]), Leanchoilia [72], Retifacies [12], Sidneyia (pl. 5:37 in [84]), Eurypterida, and Weinbergina (figure 4c in [83]). The articulating half-ring (state 0) is visible in the holotype of Liwia convexa (figure 4D in [74]) and is also present in Soomaspis (text-figure 1b–c in [82]).…”

Section: Methodsmentioning

confidence: 99%

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Arthroaspis n. gen., a common element of the Sirius Passet Lagerstätte (Cambrian, North Greenland), sheds light on trilobite ancestry

et al. 2013

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BackgroundExceptionally preserved Palaeozoic faunas have yielded a plethora of trilobite-like arthropods, often referred to as lamellipedians. Among these, Artiopoda is supposed to contain taxa united by a distinctive appendage structure. This includes several well supported groups, Helmetiida, Nektaspida, and Trilobita, as well as a number of problematic taxa. Interrelationships remain unclear, and the position of the lamellipedian arthropods as a whole also remains the subject of debate.ResultsArthroaspis bergstroemi n. gen. n. sp., a new arthropod from the early Cambrian Sirius Passet Lagerstätte of North Greenland shows a striking combination of both dorsal and ventral characters of Helmetiida, Nektaspida, and Trilobita. Cladistic analysis with a broad taxon sampling of predominantly early Palaeozoic arthropods yields a monophyletic Lamellipedia as sister taxon to the Crustacea or Tetraconata. Artiopoda is resolved as paraphyletic, giving rise to the Marrellomorpha. Within Lamellipedia, a clade of pygidium bearing taxa is resolved that can be shown to have a broadly helmetiid-like tergite morphology in its ground pattern. This morphology is plesiomorphically retained in Helmetiida and in Arthroaspis, which falls basally into a clade containing Trilobita. The trilobite appendages, though similar to those of other lamellipedians in gross morphology, have a unique outward rotation of the anterior trunk appendages, resulting in a ‘hard wired’ lateral splay, different to that observed in other Lamellipedia.ConclusionsThe combination of helmetiid, trilobite, and nektaspid characters in Arthroaspis gives important hints concerning character polarisation within the trilobite-like arthropods. The distinctive tergite morphology of trilobites, with its sophisticated articulating devices, is derived from flanged edge-to-edge articulating tergites forming a shield similar to the helmetiids, previously considered autapomorphic for that group. The stereotypical lateral splay of the appendages of lamellipedians is a homoplastic character shown to be achieved by several groups independently.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Arthroaspis n. gen., a common element of the Sirius Passet Lagerstätte (Cambrian, North Greenland), sheds light on trilobite ancestry

et al. 2013

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“…However, there is no reason to assume that Recent Xiphosura are plesiomorphic in every respect. Fossils like the xiphosuran-like species Offacolus kingi Orr et al, 2000 and perhaps Weinbergina opitzi Richter and Richter, 1929 suggest the possibility that there are chelicerate representatives possessing gills in the 2nd opisthosomal segment (Stu¨rmer and Bergstro¨m 1981;Sutton et al 2002). Accordingly, it might well be that in the arachnid ground pattern the full complement of opisthosomal respiratory organs expressed as book lungs was present in the 2nd-7th segments and that tetrapulmonates reduced the lungs in the posterior segments whereas scorpions lost them in the anterior opisthosoma.…”

Section: How Convincing Are the Arguments For Book Lung Convergence?mentioning

confidence: 97%

The book lungs of Scorpiones and Tetrapulmonata (Chelicerata, Arachnida): Evidence for homology and a single terrestrialisation event of a common arachnid ancestor

Scholtz

Kamenz

2006

Zoology

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“…2) from the Devonian Hunsrück Slate of Germany is an important species, fossils of which reveal the underside of the body and its appendages. Detailed redescriptions were offered by Stürmer and Bergstr€ om (1981) and Moore et al (2005a). W. opitzi may have 17 somites, dorsally with a clear 6 þ 11?…”

Section: Weinbergina Ymentioning

confidence: 99%