Lesueurillidae
# Lesueurillidae

Lesueurillidae is an extinct family of paleozoic molluscs (gastropods?) with anisostrophically coiled shells of uncertain position (Gastropoda?) (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).

## Taxonomy

The taxonomy of the Gastropoda by Bouchet & Rocroi, 2005 categorizes Lesueurillidae in the superfamilia Euomphaloidea within the Paleozoic molluscs with anisostrophically coiled shells of uncertain position (Gastropoda?). This family has no subfamilies.

## Genera

Genera in the family Lesueurillidae include

* Eccyliopterus Remelé, 1888
   * Eccyliopterus abendanoni
   * Eccyliopterus alatus (Roemer, 1876) - type species
   * Eccyliopterus corniculum
   * Eccyliopterus declivis Koken, 1925 - synonym: Eccyliopterus spirillum.
   * Eccyliopterus incresens
   * Eccyliopterus ottawaensis
   * Eccyliopterus owenanus
   * Eccyliopterus regularis - synonym: Eccyliopterus princeps.
   * Eccyliopterus replicata
   * Eccyliopterus septiferus
   * Eccyliopterus tolli
   * Eccyliopterus vagrans
* Lesueurilla Koken, 1898 - type genus of the family Lesueurillidae
   * Lesueurilla acutangulum
   * Lesueurilla bohemica
   * Lesueurilla beloitensis
   * Lesueurilla dilatata
   * Lesueurilla grandis
   * Lesueurilla helix
   * Lesueurilla infundibulum (Koken, 1896) - type species
   * Lesueurilla isabellaensis
   * Lesueurilla kushanensis
   * Lesueurilla louderbacki
   * Lesueurilla magna
   * Lesueurilla prima
   * Lesueurilla shirakii
   * Lesueurilla sinkiangensis
* Mestoronema P. J. Wagner, 2002
   * Mestoronema bipatellare Koken, 1925 - type species
   * Mestoronema marginalis (Koken, 1925)
   * Mestoronema scotica (Longstaff, 1924)

## Description

Fossils of family Lesueurillidae has sharp peripheral band and a short notch formed from deep V-shaped sinus. They are similar to Maclurites but they differ in early ontogenesis from them.

