Parallel evolution in phenotype may result when closely related taxa are adapting in the face of similar ecological pressures. Here, we discuss possible parallelism in shell morphology in the context of the microgeographic phylogeography of two conchologically distinct sympatric hydrocenid snails inhabiting a limestone outcrop and its cave system, Georissa pyrrhoderma and Georissa silaburensis, respectively, at Mount Silabur in Sarawak, Malaysian Borneo. Our results show a certain degree of morphological parallelism of a third, possibly new, cryptic Georissa species within the same cave that strongly diverged from its above‐ground sister species, G. pyrrhoderma. We found that both sympatric cave species have shifted from a more sculptured, conical shell toward a broader, less sculptured form.

中文翻译：

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婆罗洲Silabur山Georissa属同胞寄居微蜗牛的形态学平行性（天麻，Neritimorpha，Hydrocenidae）

当密切相关的分类单元适应相似的生态压力时，可能会导致表型的平行进化。在这里，我们有两种不同的conchologically同域hydrocenid蜗牛居住在一个石灰岩露头和它的洞穴系统，的微地理系统地理学的背景下讨论壳形态可以并行Georissa pyrrhoderma和Georissa silaburensis分别在山Silabur在沙捞越，马来西亚婆罗洲。我们的研究结果表明在一定程度上第三，形态并行的可能是新的，神秘的Georissa同一洞穴从其地上的妹妹种强烈分歧中的物种，G. pyrrhoderma。我们发现，两种同胞洞穴物种都已从更加雕刻的圆锥形外壳转变为更宽泛，更少雕刻的形式。