Helcionopsis
From Wikipedia, the free encyclopedia
Helcionopsis is an extinct genus of paleozoic monoplacophoran in the family Tryblidiidae.
| Helcionopsis Temporal range: | |
|---|---|
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| Drawing of dorsal view of the shell of Helcionopsis radiatum. Head region is on the left. | |
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| Drawing of lateral view of the shell of Helcionopsis radiatum. Head region is on the left. | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Monoplacophora |
| Order: | Tryblidiida |
| Family: | †Tryblidiidae |
| Genus: | †Helcionopsis Ulrich & Scofield, 1897[1] |
The generic name is from the external resemblance which the genus bear to the recent species of the genus Helcion in family Patellidae.[1]
Species
Species in the genus Helcionopsis include:[2]
- Helcionopsis radiatum (Lindström, 1884)
- Helcionopsis reticulatus Easton, 1943[3]
- Helcionopsis striata Ulrich, 1897[4]
- Helcionopsis subcarinata Ulrich & Scofield, 1897[5]
Shell description
General form and position of apex is as in Tryblidium, from which Helcionopsis differ in having the surface marked by fine radiating striae.[1] Muscular scars of this genus Helcionopsis unknown in 1897, when the genus was described.[1]
