Isomeria tamsiana (Dunker, 1847)

Cuezzo, Maria Gabriela, 2006, On a new species of Isomeria Beck and redescription of species of Labyrinthus Beck from South America (Gastropoda: Stylommatophora: Camaenidae), Zootaxa 1221, pp. 1-23 : 22

Isomeria tamsiana (Dunker, 1847) comb. nov.

Labyrinthus tamsiana (Dunker, 1847) , whose anatomy was described by Baker (1926) and Wurtz (1955), shows more anatomical similarities closer to Isomeria than to Labyrinthus . The presence of a vaginal swelling called ring of vaginal knobs, and the presence of a flagellar pilaster with a terminal papilla through which the vas deferens opens ( Wurtz 1955), are characters known to occur in both I. awa (this study) and I. globosa ( Solem 1966) , the only species of the genus with described anatomies. Shells of L. tamsiana illustrated by Solem (1966) shows that the aperture has a typical subquadrate form with few teeth and lamella, characteristic also of the Isomeria species. For these reasons we reclassify L. tamsiana within the genus Isomeria .