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The Bornean representatives of the genus    Georissa    (  Hydrocenidae  ) have small, dextral, conical, calcareous shells consisting of ca. three teleoconch whorls. Our recent study on the    Georissa    of Malaysian Borneo has revealed high intra- and inter-specific variation in the “scaly” group (a group of species with striking scale-like surface sculpture). The present study on the “non-scaly”    Georissa    is the continuation of the species revision for the genus. The “non-scaly” species are also diverse in shell sculptures. This informal group comprises    Georissa    with subtle spiral and/or radial sculpture. The combination of detailed conchological assessment and molecular analyses provides clear distinctions for each of the species. Conchological, molecular, and biogeographic details are presented for 16 species of “non-scaly”    Georissa   . Three of these are new to science, namely    Georissa   corrugata    sp. n. ,    Georissa   insulae    sp. n. , and    Georissa   trusmadi    sp. n.

zookeys

Conchological and molecular analysis of the “non-scaly” Bornean    Georissa    with descriptions of three new species (  Gastropoda  ,   Neritimorpha  ,   Hydrocenidae  )