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Semiactaeon
Taxonomy
Semiactaeon was named by Cossmann (1889) [Sepkoski's age data: T Eo-l T Mi Sepkoski's reference number: 914]. Its type is Tornatella sphaericula.
It was assigned to Acteonidae by Garvie (1996); and to Cephalaspida by Sepkoski (2002).
It was assigned to Acteonidae by Garvie (1996); and to Cephalaspida by Sepkoski (2002).
Species
Synonymy list
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. L. Garvie 1996 | Translation:
Shell umbilicated, inflated; protoconch obtuse and mammilate; aperture endre, rounded; outer lip sharp; with an obsolete callus pad; columella straight, a weak fold in the middle, terminated anteriorly at the base. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Kiessling 2004, Hendy et al. 2009 | |||||
Collections (13 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Ypresian | USA (Texas) | Semiacteon texanum (7788 7789 83950 84325 84337 178054) | |
| Lutetian | United Kingdom (England) | Semiacteon spaericulus (8124) | |
| Lutetian | France | Tornatella sphaericula (171533) | |
| Lutetian | USA (Texas) | Semiacteon texanum (205520 205521 205533) | |
| Late/Upper Miocene | Australia (South Australia) | Semiacteon tardior (63435) | |
| Zanclean | Australia (Victoria) | S. microplocus (166744) |