Cheloniellida
| Cheloniellida Temporal range:
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| Specimen of an indeterminate genus of Silurian cheloniellid from the Waukesha Biota of Wisconsin | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| (unranked): | †Vicissicaudata |
| (unranked): | †Cheloniellida Broili, 1932 |
| Genera | |
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See text for list | |
Cheloniellida is an unranked taxon (usually referred to as a class or order) of extinct Paleozoic arthropods, As of 2018, it comprises of 8 genera,[1] whose fossils are found in marine strata ranging from Ordovician to Devonian in age. Cheloniellida has a controversial phylogenetic position, with studies from 20th century suggested it as a relative of either Crustacea, Chelicerata or Trilobita.[1] Since 2013, it was recovered as a member of Vicissicaudata within Artiopoda.[2][3][4]
Included genera
- Cheloniellon Broili, 1932—Lower Devonian, Germany
- Duslia Jahn, 1893—Upper Ordovician, Czech Republic, Morocco
- Eoduslia Vidal, 1998—Upper Ordovician, Morocco
- Neostrabops Caster & Macke, 1952—Upper Ordovician, United States
- Paraduslia Dunlop, 2002—Lower Devonian, Russia
- Pseudarthron Selden & White, 1984—Upper Silurian
- Triopus Barrande, 1872—Upper Ordovician, Czech Republic, Morocco
- Xus Wendruff, Babcock, Mikulic & Kluessendorf, 2018—Silurian, Wisconsin
Relationships
"Originally Cheloniellon was believed to be similar to trilobites (Broili 1932), though subsequent authors have suggested that it is related to trilobites and Cambrian “merostomoids” (Størmer 1944), that it is a late representative of a trilobitomorph group giving rise to Chelicerata (Stürmer & Bergström 1978), that it is related to “loricate” crustaceans (Delle Cave & Simonetta 1991) or that it is the sister group to Chelicerata (Wills et al. 1995; Dunlop & Selden 1997)." [Account by Dunlop, 2002].
- Class Cheloniellida, sister group to class Crustacea (Boudreaux, 1979).
- Order Cheloniellida in subclass Petalopleura in class Artiopoda, this being sister to class Marellomorpha (Hou & Bergström, 1997).
- One of the five major taxa of the Arachnomorpha, sister group to the Chelicerata. The other three are Trilobita, Aglaspidida and Strabopida (Dunlop & Selden 1997, repeated by Budd, 1997).
References
- ^ a b Wendruff, Andrew James, et al. "New cheloniellid arthropod with large raptorial appendages from the Silurian of Wisconsin, USA." BioRxiv (2018): 407379. [1]
- ^ Ortega-Hernández, Javier; Legg, David A.; Braddy, Simon J. (February 2013). "The phylogeny of aglaspidid arthropods and the internal relationships within Artiopoda". Cladistics. 29 (1): 15–45. doi:10.1111/j.1096-0031.2012.00413.x.
- ^ Lerosey-Aubril, Rudy; Zhu, Xuejian; Ortega-Hernández, Javier (2017-09-11). "The Vicissicaudata revisited – insights from a new aglaspidid arthropod with caudal appendages from the Furongian of China". Scientific Reports. 7 (1): 1–18. doi:10.1038/s41598-017-11610-5. ISSN 2045-2322.
- ^ Du, Kun‐sheng; Ortega‐Hernández, Javier; Yang, Jie; Zhang, Xi‐guang (2019). "A soft‐bodied euarthropod from the early Cambrian Xiaoshiba Lagerstätte of China supports a new clade of basal artiopodans with dorsal ecdysial sutures". Cladistics. 35 (3): 269–281. doi:10.1111/cla.12344. ISSN 0748-3007.
- Boudreaux, H. Bruce (1979). Arthropod phylogeny with special reference to insects. John Wiley & Sons. ISBN 978-0471042907.
- Budd, Graham E. (1997). "Stem Group Arthropods from the Lower Cambrian Sirius Passet Fauna of North Greenland". In Fortey, Richard A. (ed.). Arthropod Relationships. Systematics Association Special Volume Series 55. Richard H. Thomas. Springer. ISBN 978-0412754203.
- Dunlop, Jason A.; Selden, Paul A. (1997). "The early history and phylogeny of the chelicerates". In Fortey, Richard A. (ed.). Arthropod Relationships. Systematics Association Special Volume Series 55. Richard H. Thomas. Springer. pp. 237–245. ISBN 978-0412754203.
- Hou Xianguang; Bergström, Jan (2006). Arthropods of the Lower Cambrian Chengliang fauna, southwest China. Fossils & Strata Monograph Series. Wiley-Blackwell. ISBN 978-8200376934.