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Feeling sluggish: The extreme semislugs of Australia (Stylommatophora,Helicarionidae)
Journal of Zoological Systematics and Evolutionary Research ( IF 2.0 ) Pub Date : 2020-03-08 , DOI: 10.1111/jzs.12376 Isabel T. Hyman 1 , Frank Köhler 1
Journal of Zoological Systematics and Evolutionary Research ( IF 2.0 ) Pub Date : 2020-03-08 , DOI: 10.1111/jzs.12376 Isabel T. Hyman 1 , Frank Köhler 1
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The extreme semislugs of the family Helicarionidae, defined as having shells of fewer than three whorls, comprise at least five independent lineages in Australia. Five genera of extreme semislugs from Queensland are treated in detail herein. We comprehensively revise the systematic classification of these genera using comparative morphology and mitochondrial phylogenetics. Parmacochlea and Thularion together comprise a single radiation, but both genera are retained based on reciprocal monophyly and the presence of distinct morphological differences, including a more developed shell, a significantly larger body size, the presence of a distinct vagina, and the absence of a penial verge in Thularion. We synonymize Parmacochlea ferrea with P. fischeri; reinstate P. smithi; give revised species descriptions for P. fischeri, P. smithi, and Thularion semoni; and describe three new species, P. balios, P. furca, and T. stanisici. The formerly monotypic genus Antiquarion is herein expanded to contain eight species. We give a revised species description for the type, A. collinsae, and introduce seven new species, A. boondah, A. chooreechillum, A. evelynensis, A. limbus, A. occultus, A. ravenshoe, and A. swausi. In addition, we describe one new genus and species, Limpidarion kukuyulangi, and give a revised species description of the monotypic genus Fenestrarion and its type species, F. brianna. We demonstrate that these four semislug groups are independent lineages, but share some morphological characters that are likely to be adaptations to shell reduction, including a unilobed ovotestis, a shortened or absent vagina, and often (but not always) a reduced flagellum and epiphallic cecum.
中文翻译：
感觉迟钝：澳大利亚的极端半sl（Stylommatophora，Helicarionidae）
在澳大利亚，Helicarionidae科的极端半sl被定义为具有少于三个轮生的壳，至少包含五个独立谱系。本文详细介绍了来自昆士兰州的五属极端半sl。我们使用比较形态学和线粒体系统发育学全面修订了这些属的系统分类。Parmacochlea和Thularion共同构成一个辐射，但两个属都基于相互的单亲性和明显的形态学差异而保留，包括更发达的外壳，明显更大的体型，明显的阴道以及不存在Thularion的刑事边缘。我们是Parmacochlea ferrea的同义词与P. fischeri ; 恢复铁匠史密斯; 对P. fischeri，P. smithi和Thularion semoni给出修订的物种描述; 并描述了三种新物种，P. balios，P. furca和T. stanisici。本文将以前的单型属Antiquarion扩展为包含八个物种。我们给出的类型，修改后的物种说明A. collinsae，并推出了七个新的物种，A. boondah，A. chooreechillum，A. evelynensis，A.缘，A. occultus，A. ravenshoe和A. swausi。此外，我们描述了一个新的属和种Limpidarion kukuyulangi，并给出了单型Fenestrarion属及其类型种F. brianna的修订物种描述。我们证明这四个半sl族是独立的谱系，但共有一些形态特征，很可能适应壳的减少，包括卵壳卵睾，阴道缩短或缺失，以及经常（但不总是）减少鞭毛和上盲肠。
更新日期：2020-03-08
中文翻译：
感觉迟钝：澳大利亚的极端半sl（Stylommatophora，Helicarionidae）
在澳大利亚，Helicarionidae科的极端半sl被定义为具有少于三个轮生的壳，至少包含五个独立谱系。本文详细介绍了来自昆士兰州的五属极端半sl。我们使用比较形态学和线粒体系统发育学全面修订了这些属的系统分类。Parmacochlea和Thularion共同构成一个辐射，但两个属都基于相互的单亲性和明显的形态学差异而保留，包括更发达的外壳，明显更大的体型，明显的阴道以及不存在Thularion的刑事边缘。我们是Parmacochlea ferrea的同义词与P. fischeri ; 恢复铁匠史密斯; 对P. fischeri，P. smithi和Thularion semoni给出修订的物种描述; 并描述了三种新物种，P. balios，P. furca和T. stanisici。本文将以前的单型属Antiquarion扩展为包含八个物种。我们给出的类型，修改后的物种说明A. collinsae，并推出了七个新的物种，A. boondah，A. chooreechillum，A. evelynensis，A.缘，A. occultus，A. ravenshoe和A. swausi。此外，我们描述了一个新的属和种Limpidarion kukuyulangi，并给出了单型Fenestrarion属及其类型种F. brianna的修订物种描述。我们证明这四个半sl族是独立的谱系，但共有一些形态特征，很可能适应壳的减少，包括卵壳卵睾，阴道缩短或缺失，以及经常（但不总是）减少鞭毛和上盲肠。
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