Lesueurillidae
Introduction '''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.
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