Lechritrochoceratidae
Lechritrochoceratidae is a family of derived tarphycerids from the middle and upper Silurian, once included in the now largely abandoned Barrandeocerida.
| Lechritrochoceratidae Temporal range: Mid-Late Silurian | |
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| Peismoceras optatum from Czech Republic, at the National Museum (Prague) | |
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| Family: | Lechritrochoceratidae Flower, 1950 |
| Genera | |
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see text | |
Description
Lechritrochoceratidae comprise dextrally torticonic genera with costate shells and ventrally displaced siphuncles. Offset coiling in low spired. Rate of expansion and coarseness of costae vary, genus to genus. Costae are generally narrow and sharp with wide areas between and slant dorso-ventrally toward the apex.
Genera
Six genera have been described:
- Lechritrochoceras
- Catyrephoceras
- Leurotrochoceras
- Peismoceras
- Systrophoceras
- Trochodicyoceras
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References
- Sweet, Walter C. 1964. Nautiloidea -Barrandeocerida. Treatise on Invertebrate Paleontology, Part K. Geological Soc. of America and Univ of Kansas press.
- Lechritrochoceratidae -Paleodb
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