3(a). Based on shell morphology, we found a third form, inhabiting the cave environment, Georissa “sp. Silabur” (Figure 4.3C), of which the shell shape is similar to the typical G. silaburensis whereas the scale characters are similar to the typical G. pyrrhoderma. In this study we therefore subject this complex of three shell forms to a morphological and molecular analysis to reveal patterns of phylogenetic relatedness among them, and offer a scenario for their evolution.
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Sources: Doctoral Thesis, Publisher's Version, Doctoral Thesis