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

Pulsipher, Mikaela A.; Anderson, Evan P.; Wright, Lauren S.; Kluessendorf, Joanne; Mikulic, Donald G.; Schiffbauer, James D.

doi:10.1080/14772019.2022.2109216

Cited by 4 publications

(4 citation statements)

References 64 publications

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“…6g) also occurs. A vermiform arthropod, Acheronauta stimulapis Pulsipher et al, 2022, is a basal mandibulate that could be related to thylacocephalans.…”

Section: Geological Settingmentioning

confidence: 99%

Not the first leech: An unusual worm from the early Silurian of Wisconsin

Braddy,

Gass,

Tessler

2023

J. Paleontol.

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An unusual worm, previously interpreted as the earliest leech, is described from the early Silurian (Llandovery, Telychian) Brandon Bridge Formation Lagerstätte (Waukesha Biota) of Wisconsin (~437 Ma). Lacking preserved internal organs, it is up to ~16 cm long, 8.2 mm wide, with ~250 annulations and a circular structure at one end, interpreted here as the broken end of a molt. It is therefore referred to Cycloneuralia incertae sedis.

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“…6g) also occurs. A vermiform arthropod, Acheronauta stimulapis Pulsipher et al, 2022, is a basal mandibulate that could be related to thylacocephalans.…”

Section: Geological Settingmentioning

confidence: 99%

Not the first leech: An unusual worm from the early Silurian of Wisconsin

Braddy,

Gass,

Tessler

2023

J. Paleontol.

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“…Usually considered as pan/eucrustaceans (Haug et al 2014;Vannier et al 2016), a recent phylogenetic analysis has positioned thylacocephalans as stem-mandibulates in a clade with two enigmatic Palaeozoic euarthropods bearing raptorial appendages (Pulsipher et al 2022): Acheronauta stimulapis Pulsipher et al, 2022 andCaptopodus poschmanni Kühl &Rust, 2012. A position within mandibulates is not surprising as it now seems certain that thylacocephalans had antenniform appendages (possibly antennula and/or antenna) and mandibula.…”

Section: Phylogenetic Affinities Of Thylacocephalansmentioning

confidence: 99%

“…In the case of thoracic raptorial appendages, thylacocephalans would have been formed by three tagma: a cephalon, an anterior trunk bearing raptorial appendages and a posterior trunk. In their phylogenetic analysis, Pulsipher et al (2022) favoured the interpretation of the raptorial appendages of thylacocephalans as the maxillula, the maxilla and a maxilliped, and thus of a two-tagma body. They did not test alternative interpretations which would probably have led to a different phylogenetic position for thylacocephalans.…”

Section: Phylogenetic Affinities Of Thylacocephalansmentioning

confidence: 99%

“…They did not test alternative interpretations which would probably have led to a different phylogenetic position for thylacocephalans. Pending confirmation of the nature of the raptorial appendages, the results of Pulsipher et al (2022) should thus be taken with caution, leaving the question of the phylogenetic affinities of thylacocephalans open.…”

Section: Phylogenetic Affinities Of Thylacocephalansmentioning

confidence: 99%

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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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The Waukesha Biota: a wonderful window into early Silurian life

Gass,

Braddy

2023

Geology Today

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The Waukesha Biota (Brandon Bridge Formation Lagerstätte) is a diverse assemblage of early Silurian (437 Ma) shallow marine fossils from Wisconsin, USA. Their exceptional preservation, in finely laminated dolomitic mudstones, was mediated by tidally‐influenced conditions and/or microbial entombment. Shelly biomineralized animals are rare, but soft‐bodied organisms are common. Arthropods dominate, including trilobites, phyllocarids, ostracodes, a thylacocephalan, a synziphosurine and various enigmatic groups. The fauna also includes evolutionary ‘holdovers’, such as palaeoscolecids and a lobopodian.

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

Cited by 4 publications

References 64 publications

Not the first leech: An unusual worm from the early Silurian of Wisconsin

Not the first leech: An unusual worm from the early Silurian of Wisconsin

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

The Waukesha Biota: a wonderful window into early Silurian life

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