CONICET | Buscador de Institutos y Recursos Humanos

Two new species of calliotropid gastropods, Calliotropis (Riselloidea) faustiankensissp. nov. and Calliotropis (Riselloidea) lukovensis sp. nov., are described from theMiddle Jurassic (Middle Bathonian−Upper Callovian) of Poland. Additionally, newexcellently preserved shells of Calliotropis (Riselloidea) biarmata (Münster) allowed toredefine this species. The new morphological information obtained from these threefossil species of Calliotropis in suite with the data set assembled from 20 extinct and 24living calliotropids are here summarized in quantitative multivariate and principalcomponent analyses suggesting an onshore-offshore trend in calliotropid gastropodevolution from the Triassic to Recent times. This trend?expressed in the morphologyof shells?shows that the Mesozoic species are mostly shallow water [Calliotropis(Riselloidea) subdisjuncta, C. (R.) naybandensis, C. (R.) torallolensis, C. (R.)aliabadensis, C. (R.) iranicus, C. (R.) vaihingensis, C. (R.) noszkyi, C. (R.) cf. keideli, C.(R.) tagorei, C. (R.) elongata, C. (R.) multistriata, C. (R.) lorioli, C. (R.) pileiformis, C.(R.) vierowiensis, C. (R.) seguris, C. (R.) łukovensis, C. (R.) faustiankensis, C. (R.)biarmata, C. (R.) microglyptophorus, C. (R.) antarchais and C. (R.) arenosa] whileCenozoic and Recent taxa are mostly deep water [Calliotropis (Calliotropis) ottoi, C.(C.) oros, C. (C.) denticulus, C. (C.) stegos, C.(C.) nomismasimilis, C. (C.) echidnoides,C. (C.) excelsior, C. (C.) helix, C. (C.) dicrous, C. (C.) derbiosa, C. (C.) cooperculum,C. (C.) acherontis, C. (C.) cycloides, C. (C.) micraulax, C. (C.) eucheloides, C. (C.)elephas, C. (C.) infundibulum, C. (C.) ceciliae, C. (C.) andamanensis, C. (C.)bukabukaensis]. This distinction supports earlier suggestion that the genus Calliotropiscan be subdivided in two temporal subgenera belonging to the family EucyclidaeKoken.