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).

Lesueurillidae
Lesueurilla helix
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
Superfamily:
Euomphaloidea
Family:
Lesueurillidae

Genera

see text.

Taxonomy

The taxonomy of the Gastropoda by Bouchet & Rocroi, 2005[2] 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[3]

  • 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[1]
    • 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.[1] They are similar to Maclurites but they differ in early ontogenesis from them.[1]

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gollark: It's not unhealable. As far as I know, people mostly deal with it eventually.
gollark: It is of course not exactly very easy to know if there *is* no other way.
gollark: Regardless of actual evidence or truth.
gollark: I mean, you could argue that if you feel *extremely* unhappy if you don't believe in an afterlife, and there is no way to deal with this apart from believing in an afterlife, it's rational to believe in it.

References
  1. Wagner P. J. 2002. Phylogenetic relationships of the earliest anisostrophically coiled gastropods. Smithsonian Contributions to Paleobiology, 88: 152 pp. Page 75.
  2. 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. ISBN 3-925919-72-4. ISSN 0076-2997. 397 pp. http://www.vliz.be/Vmdcdata/imis2/ref.php?refid=78278
  3. Lesueurillidae. The Paleobiology Database, accessed 13 August 2009.
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