Lechritrochoceratidae
| Lechritrochoceratidae Temporal range: Mid-Late Silurian
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| Peismoceras optatum from Czech Republic, at the National Museum (Prague) | |
| Scientific classification | |
| Kingdom: | Animalia
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| Phylum: | |
| Class: | Cephalopoda
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| Subclass: | Nautiloidea
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| Order: | |
| Suborder: | |
| Family: | Lechritrochoceratidae Flower, 1950
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| Genera | |
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see text | |
Lechritrochoceratidae is a family of derived tarphycerids from the middle and upper Silurian, once included in the now largely abandoned Barrandeocerida.
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:
References[]
- Sweet, Walter C. 1964. Nautiloidea -Barrandeocerida. Treatise on Invertebrate Paleontology, Part K. Geological Soc. of America and Univ of Kansas press.
- Lechritrochoceratidae -Paleodb
Categories:
- Nautiloids
- Cephalopod families
- Silurian first appearances
- Silurian extinctions