Coreospiridae

Cycloholcus nummus, from Knight et al. (1960).

Belongs within: Helcionelliformes.

The Coreospiridae are a group of univalved molluscs from the Early Cambrian with a planispiral or near-planispiral shell with few coils (Parkhaev 2002).

<==Coreospiridae
    |--Oelandiella Vostokova 1962 (see below for synonymy) P02
    |--Cambrospira Yu 1979 P02
    |--Hugiagouella Chen & Zhang 1980 P02
    |--Cambroconus Yu 1981 P02
    |--Hubeispira Yu 1981 P02
    |--Chabaktiella Missarzhevsky 1981 P02
    |--Uncinaspira He 1984 P02
    |--‘Gibbaspira’ He 1984 non McLean 1971 P02
    |--Anhuiconus Zhou & Xiao 1984 P02
    |--Tichkaella Geyer 1986 P02
    |--Kutanjia Kruse 1991 P02
    |--Coreospira Saito 1936 P02
    |    `--*C. rugosa Saito 1936 KC60
    |--Latouchella Cobbold 1921 [Latouchellidae, Latouchellinae] P02
    |    `--*L. costata Cobbold 1921 F62
    `--Cycloholcus Knight 1947 KC60
         `--*C. nummus Knight 1947 KC60

Oelandiella Vostokova 1962 [incl. Archaeospira Yu 1979, Pseudoyangtzespira Bokova 1990, Yangtzespira Yu 1979; Archaeospiridae, Yangtzespiridae, Yangtzespirinae] P02

*Type species of generic name indicated

REFERENCES

[F62] Fisher, D. W. 1962. Small conoidal shells of uncertain affinities. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt W. Miscellanea: Conodonts, Conoidal Shells of Uncertain Affinities, Worms, Trace Fossils and Problematica pp. W98–W143. Geological Society of America, and University of Kansas Press.

[KC60] Knight, J. B., L. R. Cox, A. M. Keen, R. L. Batten, E. L. Yochelson & R. Robertson. 1960. Gastropoda: systematic descriptions. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt I. Mollusca 1: Mollusca—General Features, Scaphopoda, Amphineura, Monoplacophora, Gastropoda—General Features, Archaeogastropoda and some (mainly Paleozoic) Caenogastropoda and Opisthobranchia pp. I169–I331. Geological Society of America, and University of Kansas Press.

[P02] Parkhaev, P. Yu. 2002. Phylogenesis and the system of the Cambrian univalved mollusks. Paleontologicheskii Zhurnal 2002 (1): 27–39 (transl. Paleontological Journal 36 (1): 25–36).