Biology:Aglaspidida

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Short description: Extinct order of arthropods

Aglaspidida
Temporal range: Guzhangian–Katian[1]
Aglaspis spinifer.jpg
Aglaspis spinifer
Beckwithia collection Paul Hille.jpg
Fossil of Beckwithia typa
Scientific classification e
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
(unranked): †Artiopoda
(unranked): †Vicissicaudata
Order: †Aglaspidida
Walcott, 1911
Subtaxa[1]
  • †Australaglaspis
  • †Beckwithia
  • †Tremaglaspididae
    • †Brachyaglaspis
    • †Chlupacaris
    • †Cyclopites
    • †Flobertia
    • †Quasimodaspis
    • †Tremaglaspis
  • †Aglaspididae
    • †Aglaspella
    • †Aglaspis
    • †Aglaspoides
    • †Chraspedops
    • †Glypharthrus
    • †Gogglops
    • †Hesselbonia
    • †Setaspis
    • †Tuboculops
    • †Uarthrus

Aglaspidida is an extinct order of aquatic arthropods that were once regarded as primitive chelicerates. However, anatomical comparisons demonstrate that the aglaspidids cannot be accommodated within the chelicerates,[2] and that they lie instead within the Artiopoda, thus placing them closer to the trilobites.[3] Aglaspidida contains the subgroups Aglaspididae and Tremaglaspididae, which are distinguished by the presence of acute/spinose genal angles and a long spiniform tailspine in the Aglaspididae.[1]

Aglaspidid fossils are found in North America (upper Mississippi valley, Missouri and Utah), Europe, Australia , and China . Certain other artiopods are believed to be closely related to the aglaspidids, including the order Strabopida, which includes the genera Strabops, Paleomerus, Parapaleomerus, and possibly Khankaspis.

List of genera

References

  1. ↑ 1.0 1.1 1.2 Lerosey-Aubril, Rudy; Zhu, Xuejian; Ortega-Hernández, Javier (September 11, 2017). "The Vicissicaudata revisited – insights from a new aglaspidid arthropod with caudal appendages from the Furongian of China". Scientific Reports 7 (1): 11117. doi:10.1038/s41598-017-11610-5. PMID 28894246. 
  2. ↑ Ortega-Hernández, J.; Braddy, S. J.; Jago, J. B.; Baillie, P. W. (2010). "A new aglaspidid arthropod from the Upper Cambrian of Tasmania". Palaeontology 53 (5): 1065–1076. doi:10.1111/j.1475-4983.2010.00974.x. 
  3. ↑ Ortega-Hernández, J.; Legg, D. A.; Braddy, S. J. (2013). "The phylogeny of aglaspidid arthropods and the internal relationships within Artiopoda". Cladistics 29: 15–45. doi:10.1111/j.1096-0031.2012.00413.x. 
  • Hesselbo, SP. 1992. Aglaspidida (Arthropoda) from the Upper Cambrian of Wisconsin. Journal of Paleontology 66(6)885-923.
  • Raasch, GO. 1939. Cambrian Merostomata. Geological Society of America Special Paper 19, 146p.

External links

Wikidata ☰ Q394207 entry




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