Anarthraspis

Anarthraspis is an extinct genus of arthrodire placoderm fishes which lived during the Early Devonian period.^[1][2] It contains two species described in 1932, Anarthraspis chamberlini and Anarthraspis montanus, both found in the Beartooth Butte Formation of Wyoming and Montana, USA, and assigned to the genus in 1934.^[3]

Anarthraspis Temporal range: Early Devonian, 419–393 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	†Placodermi
Order:	†Arthrodira
Genus:	†Anarthraspis Bryant, 1934
Species
†Anarthraspis chamberlini Bryant, 1932 (type) †Anarthraspis montanus Bryant, 1932

The type species, Anarthraspis chamberlini, was a contemporary of the placoderm Bryantolepis. The specific epithet, chamberlini, honours British Prime Minister Neville Chamberlain.

Anarthraspis is one of the more basal members of the order Arthrodira, as shown in the cladogram below:^[4]

Lunaspis broilii Eurycaraspis incilis Arthrodira Yujiangolepis liujingensis Antarctaspis mcmurdoensis Wuttagoonaspidae Yiminaspis shenme Wuttagoonaspis fletcheri Aethaspis major Aethaspis utahensis Lehmanosteus hyperboreus Aleosteus eganensis Simblaspis cachensis Kujdanowiaspis buczacziensis Kujdanowiaspis podolica Erikaspis zychi Sigaspis lepidophora Eskimaspis heintzi Baringaspis dineleyi Proaethaspis ohioensis Anarthraspis chamberlini Heightingtonaspis anglica Phyllolepida Gavinaspis convergens Phyllolepis orvini Austrophyllolepis sp. Cowralepis mclachlani Placolepis budawangensis Actinolepidae Bollandaspis woschmidti Actinolepis spinosa Actinolepis magna Actinolepis tuberculata Bryantolepis brachycephalus Phlyctaenioidei Phlyctaeniidae Groenlandaspidae Arctaspidae Dicksonosteus arcticus Arctolepidae Brachythoraci

Actinolepidoidei Phlyctaeniina

References

1. Schultze, Hans-Peter (1978). Handbook of Paleoichthyology. G. Fischer Verlag. pp. 45–47. ISBN 978-3-437-30265-7.
2. Camp, Charles Lewis; Taylor, David Nathaniel; Welles, Samuel Paul (1942). Bibliography of Fossil Vertebrates, 1934-1938. The Society. p. 462. ISBN 978-0-8137-2042-5.
3. Bryant, William L.; Ruedemann, Rudolph (Feb 1934). "The Fish Fauna of Beartooth Butte, Wyoming. Parts II and III". Proceedings of the American Philosophical Society. 73 (3): 127–167.
4. Dupret, V.; Zhu, M. I. N.; Wang, J. N. Q. (2009). "The morphology of Yujiangolepis liujingensis (Placodermi, Arthrodira) from the Pragian of Guangxi (south China) and its phylogenetic significance". Zoological Journal of the Linnean Society. 157: 70. doi:10.1111/j.1096-3642.2009.00519.x.