Kingdom Animalia Class Cephalopoda Order Tarphycerida Rank Family | Phylum Mollusca Subclass Nautiloidea Suborder Barrandeocerina | |
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Lechritrochoceratidae is a family of derived tarphycerids from the middle and upper Silurian, once included in the now largely abandoned Barrandeocerida.
Contents
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 TrochodicyocerasReferences
Lechritrochoceratidae Wikipedia(Text) CC BY-SA