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Acutichiton
Taxonomy
Acutichiton was named by Hoare et al. (1972) [Sepkoski's age data: C Serp-l P Wc Sepkoski's reference number: 277]. Its type is Acutichiton pyrmidalus.
It was assigned to Lepidopleuridae by Hoare et al. (1972) and Hoare and Sturgeon (1976); to Acutichitonidae by Hoare et al. (1983), Debrock et al. (1984) and Hoare et al. (2002); and to Neoloricata by Sepkoski (2002).
It was assigned to Lepidopleuridae by Hoare et al. (1972) and Hoare and Sturgeon (1976); to Acutichitonidae by Hoare et al. (1983), Debrock et al. (1984) and Hoare et al. (2002); and to Neoloricata by Sepkoski (2002).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1972 | Acutichiton Hoare et al. p. 679 |
| 1976 | Acutichiton Hoare and Sturgeon p. 845 |
| 1983 | Acutichiton Hoare et al. |
| 1984 | Acutichiton Debrock et al. |
| 2002 | Acutichiton Hoare et al. p. 257 |
| 2002 | Acutichiton Sepkoski |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Acutichiton Hoare et al. 1972
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†Acutichiton gracilis Hoare et al. 2002
†Acutichiton nevadensis Hoare et al. 2002
†Acutichiton pannuceus Hoare and Mapes 1985
†Acutichiton pyrmidalus Hoare et al. 1972
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. D. Hoare et al. 1972 | Small polyplacophorans with intermediate valves wider than long and nearly straight across width. Tail valve triangular in shape, keel extending entire length and lacking a mucro, gently concave or straight lateral slopes which are steeply inclined and underside of posterior portion commonly ridged parallel to valve margin by coalescence of coarse surface granules. Dorsal surface of valves sculptured by fine granules in quincunx arrangement. Head valve and girdle unknown. | |
| R. D. Hoare and M. T. Sturgeon 1976 | Small polyplacophorans with head and intermediate valves wider than long, nearly straight across width, with ii valve slightly longer than iii-vii valves. Tail valve triangular in shape, keel extending entire length and lacking a mucro, nearly plane lateral slopes which are steeply inclined, underside of posterior portion smooth or with concentric growth lines. Dorsal surface of valves sculptured by fine granules in quincunx arrangement. Girdle unknown. |