Lesueurillidae Explained

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^[1] 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^[2]

• 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.

Notes and References

1. Bouchet P. & Rocroi J.-P. (Ed.); Frýda J., Hausdorf B., Ponder W., Valdés Á. & Warén A. 2005. Classification and nomenclator of gastropod families. Malacologia: International Journal of Malacology, 47(1-2). ConchBooks: Hackenheim, Germany. . ISSN 0076-2997. 397 pp. http://www.vliz.be/Vmdcdata/imis2/ref.php?refid=78278
2. Lesueurillidae. The Paleobiology Database, accessed 13 August 2009.