Lechritrochoceratidae

Lechritrochoceratidae Temporal range: Mid-Late Silurian
Peismoceras optatum from Czech Republic, at the National Museum (Prague)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Nautiloidea
Order:	†Tarphycerida
Suborder:	†Barrandeocerina
Family:	†Lechritrochoceratidae Flower, 1950
Genera[1]
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:

• Lechritrochoceras Foerste, 1926
• Catyrephoceras Foerste, 1926
• Leurotrochoceras Foerste, 1926
• Peismoceras Hyatt, 1894
• Systrophoceras Hyatt, 1894
• Trochodictyoceras Foerste, 1926

References

1. "Lechritrochoceratidae". Paleobiology Database. Retrieved 11 November 2022.

• Sweet, Walter C. 1964. Nautiloidea -Barrandeocerida. Treatise on Invertebrate Paleontology, Part K. Geological Soc. of America and Univ of Kansas press.
• Lechritrochoceratidae -Paleodb