New cheloniellid arthropod with large raptorial appendages from the Silurian of Wisconsin, USA

Wendruff, Andrew J.; Babcock, Loren E.; Mikulic, Donald G.; Kluessendorf, Joanne

doi:10.1101/407379

Cited by 4 publications

(36 citation statements)

References 43 publications

(47 reference statements)

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“…6F) under low angle light, and also in UWGM2436 (Wendruff et al . 2018, fig. 1e–f), UWGM2437 (Wendruff et al .…”

Section: Systematic Palaeontologymentioning

confidence: 99%

“…Finally, the first appearance of potential pleural spines does not coincide with either the axial constriction or the fan‐like posterior limbs, and may be found as anteriorward as segment 7 or 8 (Wendruff et al . 2018, fig. 1e).…”

Section: Systematic Palaeontologymentioning

confidence: 99%

“…While some specimens of this unofficially described taxon, including the putative holotype UWGM2439 (Wendruff et al . 2018, fig. 1a–c) and one of the putative paratypes, UWGM2345 (Wendruff et al .…”

Section: Phylogenetic Analysis and Affinitiesmentioning

confidence: 99%

“…1a–c) and one of the putative paratypes, UWGM2345 (Wendruff et al . 2018, fig. 1d), may indeed be cheloniellids, or at least vicissicaudatans, others (UWGM2436, 2437 and 2575; Wendruff et al .…”

Section: Phylogenetic Analysis and Affinitiesmentioning

confidence: 99%

“…1d), may indeed be cheloniellids, or at least vicissicaudatans, others (UWGM2436, 2437 and 2575; Wendruff et al . 2018, fig. 1e–l) more closely resemble Parioscorpio venator , and we reassign them as such.…”

Section: Phylogenetic Analysis and Affinitiesmentioning

confidence: 99%

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Stranger than a scorpion: a reassessment of Parioscorpio venator, a problematic arthropod from the Llandoverian Waukesha Lagerstätte

et al. 2021

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A relatively uncommon arthropod of the Waukesha lagerstätte, Parioscorpio venator, is redescribed as an arthropod bearing a combination of characters that defy ready classification. Diagnostic features include sub‐chelate ‘great appendages’, a lack of antennae, multiramous anterior trunk appendages, filamentous fan‐like rear trunk appendages, and apparently thin and poorly preserved pleural fields. Phylogenetic analysis resolves this organism as basal to crown‐group Mandibulata and Chelicerata, but its exact placement is inconclusive. Thus, we compare its morphology to several stem groups of arthropods in a discussion of its plausible taxonomic affinities. The examined specimens are probably carcasses and preserve a variety of soft‐tissue details, including muscle blocks in the head, eyes and eye facets, likely ventral nerve cords, a central gut tract and trunk legs with multiple filamentous elements organized into stiff bundles. The preservation habits of P. venator are characterized and compared to previous assessments of Waukesha lagerstätte taxa. Four preservation habits are observed: a phosphatized habit showing flattened to partly three‐dimensional mineralization in francolite; a mouldic habit largely left behind by removed francolite that shows no carbon enrichment despite a darkened colour; sheet‐like or speckled carbonaceous compressions; and scattered pyrite crystals. This redescription highlights both the palaeobiological value of ‘small’ lagerstätten typical of the middle Palaeozoic and the caution that must be taken when interpreting their more enigmatic constituents.

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“…6F) under low angle light, and also in UWGM2436 (Wendruff et al . 2018, fig. 1e–f), UWGM2437 (Wendruff et al .…”

Section: Systematic Palaeontologymentioning

confidence: 99%

Section: Systematic Palaeontologymentioning

confidence: 99%

Section: Phylogenetic Analysis and Affinitiesmentioning

confidence: 99%

Section: Phylogenetic Analysis and Affinitiesmentioning

confidence: 99%

Section: Phylogenetic Analysis and Affinitiesmentioning

confidence: 99%

See 3 more Smart Citations

Stranger than a scorpion: a reassessment of Parioscorpio venator, a problematic arthropod from the Llandoverian Waukesha Lagerstätte

et al. 2021

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Redescription of the cheloniellid euarthropodTriopus draboviensisfrom the Upper Ordovician of Bohemia, with comments on the affinities ofParioscorpio venator

Roy

Rak²,

Budil

et al. 2022

Geol. Mag.

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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 cephalic shields with its trunk. Notwithstanding, Triopus draboviensis has eluded detailed restudy in the 150 years since its first description. Here we provide a redescription of the holotype and hitherto only known specimen of Triopus draboviensis, and describe a recently discovered second partial specimen as Triopus sp. It is shown that the holotype of Triopus draboviensis preserves the complete cephalic shield, while the trunk reveals a likely articulating device, which may represent an apomorphy for Cheloniellida. Further information on the trunk morphology provided by the new specimen has allowed a complete reconstruction of the dorsal exoskeleton of Triopus. An assessment is made of fossils previously suggested to represent the cephalic shield of Triopus draboviensis; while it is shown that none of those fossils can be attributed to Triopus, it is reaffirmed that Drabovaspis complexa likely does belong to Cheloniellida, making Drabovaspis the third cheloniellid genus known from the Letná Formation, after Triopus and Duslia. A revised diagnosis for Cheloniellida is provided, and the recently described problematic euarthropod Parioscorpio venator from the Silurian of Wisconsin is firmly rejected from this clade.

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A sting in the tale of Parioscorpio venator from the Silurian of Wisconsin: is it a cheloniellid arthropod?

Braddy

Dunlop

2021

LET

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Parioscorpio venator Wendruff et al., 2020a from the early Silurian Waukesha biota of Wisconsin, USA, interpreted as the earliest scorpion, then a basal euarthropod, is reinterpreted here as a cheloniellid-like arthropod with large raptorial appendages. The diversity of Cheloniellida Broili, 1932 is reviewed. Drabovaspis complexa Chlupáč, 1963, from the Upper Ordovician Letná Formation of Czechia, interpreted as an aglaspidid, then a xiphosuran, is also reinterpreted here as a cheloniellid. □ cheloniellid, scorpion, Silurian, Wisconsin.

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New cheloniellid arthropod with large raptorial appendages from the Silurian of Wisconsin, USA

Cited by 4 publications

References 43 publications

Stranger than a scorpion: a reassessment of Parioscorpio venator, a problematic arthropod from the Llandoverian Waukesha Lagerstätte

Stranger than a scorpion: a reassessment of Parioscorpio venator, a problematic arthropod from the Llandoverian Waukesha Lagerstätte

Redescription of the cheloniellid euarthropodTriopus draboviensisfrom the Upper Ordovician of Bohemia, with comments on the affinities ofParioscorpio venator

A sting in the tale of Parioscorpio venator from the Silurian of Wisconsin: is it a cheloniellid arthropod?

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