Hemiarthrum

{{speciesbox

| parent_authority = Carpenter in Dall, 1876

| genus = Hemiarthrum

| species = setulosum

| authority = Carpenter in Dall, 1876

| synonyms =

Acanthochiton couthouyi Rochebrune, 1889 (junior subjective synonym)
Acanthochiton stygma Rochebrune, 1889 (uncertain synonym)
Chiton castaneus A. Gould, 1852 (invalid: junior primary homonym of Chiton castaneus W. Wood, 1815)
Hemiarthrum hamiltonorum Iredale & Hull, 1932
Hemiarthrum setulosum Powell, 1957

}}

Hemiarthrum setulosum is a species of chiton in the family Hemiarthridae, the only member of the genus Hemiarthrum. It was previously assigned to the family Hanleyidae.Powell A. W. B., New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 {{ISBN|0-00-216906-1}}

Hemiarthrum setulosum represent one of the five major clades of chitons that are living. Hemiarthrim setulosum has an incomplete lateral tract in the nerve ring. They are the only known species to have an incomplete one. Sumner‐Rooney, Lauren, and Julia D. Sigwart. "Do chitons have a brain? New evidence for diversity and complexity in the polyplacophoran central nervous system." Journal of morphology 279.7 (2018): 936-949.

;Synonym

Hemiarthrum hamiltonorum Iredale & Hull, 1932: synonym of Hemiarthrum setulosum P. P. Carpenter [in Dall], 1876 (junior subjective synonym)

Distribution

This species occurs off the Kerguelen Islands and Cape Horn.

References

{{reflist|refs=

{{cite WoRMS |title=Hemiarthrum |id=385583 |access-date=2025-03-07 |db=Mollusca}}

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Rochebrune, A.-T., 1889 - Polyplacophores. In Rochebrune, A.T. & Mabille, J., Mission Scientifique du Cap Horn, vol. 6, part. Zoologie, p. 131-143, pl9
Spencer, H.G., Marshall, B.A. & Willan, R.C. (2009). Checklist of New Zealand living Mollusca. Pp 196-219. in: Gordon, D.P. (ed.) New Zealand inventory of biodiversity. Volume one. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Canterbury University Press, Christchurch

External links

[https://www.biodiversitylibrary.org/page/32374223 Dall, W. H. (1876). Mollusks. In: J.H. Kidder, Contributions to the natural history of Kerguelen Island, made in connection with the United States "Transit-of-Venus" Expedition, 1874-1875, II. Bulletin of the United States National Museum. 3: pp. 42–48]

Category:Chitonida

Category:Monotypic chiton genera