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1 January 2008 Convergence Caused Confusion: On the Systematics Of the Freshwater Gastropod Sulcospira pisum (Brot, 1868) (Cerithioidea, Pachychilidae)
Frank Köhler, Nora Brinkmann, Matthias Glaubrecht
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Abstract

We document a case of shell convergence in sympatric freshwater cerithioidean gastropods that has caused confusion in traditional classifications emphasizing shell features. Based on the comparative study of the operculum, radula, and embryonic shell obtained from dry remains of soft bodies, we present evidence that “Melaniapisum is not a thiarid species closely related to Balanocochlis glans (Busch, 1842), as has been supposed with respect to the very similar shells of both species. The species is transferred to the family Pachychilidae, because it shows various typical character states for the family. It is tentatively placed within the genus Sulcospira, which is endemic to Java. We assume that a similar shell shape has evolved in both species of not closely related gastropods through convergence, which once more reveals that purely shell-based classifications are particularly problematic.

Frank Köhler, Nora Brinkmann, and Matthias Glaubrecht "Convergence Caused Confusion: On the Systematics Of the Freshwater Gastropod Sulcospira pisum (Brot, 1868) (Cerithioidea, Pachychilidae)," Malacologia 50(1-2), 331-339, (1 January 2008). https://doi.org/10.4002/0076-2997-50.1-2.331
Published: 1 January 2008
JOURNAL ARTICLE
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KEYWORDS
Balanocochlis
Cerithioidea
convergence
Java
Molluscan shell
Thiaridae
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