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首页> 外文期刊>Journal of Molluscan Studies >Anatomy and affinities of Micropilina minuta Waren, 1989 (Monoplacophora: Micropilinidae)
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Anatomy and affinities of Micropilina minuta Waren, 1989 (Monoplacophora: Micropilinidae)

机译：Micropilina minuta Waren的解剖学和亲和力，1989年（Monoplacophora：Micropilinidae）

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摘要

The anatomy of the tiny (maximum shell length 1.5 mm) monoplacophoran limpet Micropilina minuta Waren, 1989 was studied by means of semithin serial sections with subsequent 3D computer analysis and visualization (interactive 3D model in the online version). As in other monoplacophorans there are eight pairs of shell muscles ('sectors' A-H). The species has four pairs (unique for monoplacophorans, sectors D-G) of small gills, four pairs of kidneys (sectors A, D-F) which also have gamete-releasing function (sectors D, E), and one (or two) pair(s) of gonadal sacs. Eggs are yolk-rich, but there are no signs of retention of eggs in the mantle cavity for brooding. Only some of these characters, particularly those connected with miniaturization, are shared with Micropilina arntzi. Two characters (absence of a heart and absence of sector G kidneys) are interpreted as synapomorphies of these two species. Based on these new data the supraspecific systematics of Micropilina and Micropilinidae are reevaluated. We also discuss the implications for the evolution of the serial arrangement of organs in the Neopilinoidea.
机译：通过半薄系列切片并随后进行3D计算机分析和可视化（在线版本中的交互式3D模型），研究了微小的（最大壳长1.5 mm）微型单壁帽贝Micropilina minuta Waren，1989年的解剖结构。与其他单斜发足动物一样，有八对壳肌（“扇形区” A-H）。该物种有四对小mono（对于单pla生，扇区DG是唯一的），四对还具有配子释放功能的肾脏（扇区A，DF）（一对D，E）和一对（或两对） ）的性腺囊。鸡蛋富含卵黄，但是没有蛋留在套腔中进行孵化的迹象。 Micropilina arntzi仅共享其中一些字符，尤其是与小型化相关的字符。两个字符（缺少心脏和扇形G肾的缺失）被解释为这两个物种的同型。基于这些新数据，重新评估了微毛虫和微毛虫科的超特异系统。我们还将讨论对新毛虫纲器官的系列排列演变的影响。

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