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Revision of Partulidae (Gastropoda Stylommatophora) of Palau with description of a new genus for an unusual ground-dwelling species

机译:修订帕劳的ul科(天麻食草科)并描述了一种不寻常的地面栖居物种的新属

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摘要

We describe a new stylommatophoran land snail of the family Partulidae from Palau. The new species has a combination of morphological and ecological characters that do not allow its placement in any existing partulid genus, so we describe a new genus for it. The new genus is characterized by a large (18–23 mm) obese-pupoid shell; smooth protoconch; teleoconch with weak and inconsistent, progressively stronger, striae; last half of body whorl not extending beyond the penultimate whorl; widely expanded and reflexed peristome; relatively long penis, with longitudinal pilasters that fuse apically into a fleshy ridge that divides the main chamber from a small apical chamber; and vas deferens entering and penial-retractor muscle attaching at the apex of the penis. Unlike all other partulids, the new species is strictly associated with rocks in contact with the ground. Comparing the other three Palauan species – currently assigned to Partula – to our new genus and to other partulids makes it clear that they require their own genus because their morphology is quite different from that of true Partula and from that of all other genera. Hence, we resurrect the name Palaopartula Pilsbry for these snails.
机译:我们描述了来自帕劳的Partulidae家族的一种新的Strommatophoran蜗牛。新物种具有形态和生态特征的组合,因此不允许将其放置在任何现有的分属属中,因此我们为它描述了一个新属。新属的特征是大(18-23毫米)的肥胖-类oid壳。光滑的协议带有细弱和前后不一致,逐渐增强的条纹的遥调;身体螺纹的后半部分不延伸到倒数第二个螺纹之外;广泛扩展和反射的Peristome;阴茎相对较长,有纵向的壁柱,顶部逐渐融合成肉质的脊,将主腔与小顶腔分隔开;输精管进入并在阴茎根尖附着了牵拉肌。与所有其他部分不同,新物种严格与与地面接触的岩石相关联。将目前分配给Partula的其他三个Pala琉属物种与我们的新属和其他Partulids进行比较,可以清楚地知道它们需要自己的属,因为它们的形态与真正的Partula和所有其他属的形态完全不同。因此,我们为这些蜗牛重新命名了Palaopartula Pilsbry。

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