Life on a leaf: 3D-reconstruction and description of a new limapontiid sacoglossan (Gastropoda: Heterobranchia: ‘Opisthobranchia’) living on the seagrass Halophila ovalis

Life on a leaf: 3D-reconstruction and description of a new limapontiid sacoglossan (Gastropoda: Heterobranchia: ‘Opisthobranchia’) living on the seagrass Halophila ovalis
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叶子上的生命:生活在海草 Halophila ovalis 上的新 limapontiid sacoglossan(腹足纲:异鳃亚纲:“Opisthobranchia”)的 3D 重建和描述

DOI:
10.1093/mollus/eyu071
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发表时间:
2014
影响因子:
1.2
通讯作者:
Schrödl
Schrödl
中科院分区:
生物学3区
文献类型:
--
作者:
Jensen;Kohnert;Bendell;Schrödl

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吸汁液的海蛞蝓,Sacoglossa,几乎都是吸吮性食草动物,以虹吸绿藻为食。水藻可能是水藻科中种类最丰富的属,至少有25种,其中大部分以丝状绿藻为食。在这里,我们描述了一种来自泰国安达曼海沿岸的新物种。该物种非常小,在性成熟的动物中通常不到1毫米长。它只存在于蛋形海葵的叶子上,因此我们将其命名为嗜盐海葵。通过连续切片和3d重建研究了解剖和组织学。这是第一个在完整的3d显微解剖细节中研究的limapontioid物种。嗜盐菌有几个特殊的特征。没有心脏和心包膜,在其他一些种类的舌鸟中也可以看到。唾液腺非常突出,左右两侧不相等。沿主要消化腺小管有高度空泡化的细胞系统。这些细胞显然与肾脏有关,我们认为它们与排泄有关。管状牙齿呈破坏状,在形状上更接近于神秘的日本黑alderiopsis,而不是任何已知的ercolania物种。生殖系统是典型的利马蓬体,有一个封闭的精囊,一个渗透的阴茎柱头和一个双叶的前列腺。蛋白腺的分支进入角状体,在一些但不是所有的物种中都可以看到。因此,我们将该物种归为colania,而不是定义不清的alderiopsis。我们简要地比较了利玛蓬属,并表明需要修订。
Sap-sucking sea slugs, Sacoglossa, are almost all suctorial herbivores feeding on siphonalean green algae.Ercolaniais probably the most species-rich genus in the family Limapontiidae, containing at least 25 species, most of which feed on filamentous green algae of the order Cladophorales. Here we describe a newErcolaniaspecies from the Andaman Sea coast of Thailand. The species is very small, generally less than 1 mm long in sexually mature animals. It is found exclusively on the leaves of the seagrassHalophila ovalisand accordingly we name itErcolania halophilaen. sp. Anatomy and histology have been studied by serial sectioning and 3D-reconstruction. This is the first limapontioid species studied in full 3D-microanatomical detail.Ercolania halophilaeshows several special features. A heart and pericardium are absent, as is also seen in a few other species of Sacoglossa. Salivary glands are very prominent and unequal on left and right sides. There is a system of highly vacuolated cells situated along the main digestive gland tubules. Those cells are apparently associated with the kidney and we assume that they are involved in excretion. Radular teeth are sabot-shaped and more similar in shape to those of the enigmatic JapaneseAlderiopsis nigrathan to any known species ofErcolania. The reproductive system is typical limapontiid, with a closed seminal receptacle, a penetrant penial stylet and a bilobed prostate gland. Branches of the albumen gland enter the cerata, as seen in some but not all species presently referred toErcolania. We therefore place the species inErcolaniarather than the poorly definedAlderiopsis. We briefly compare limapontiid genera and show that revision is needed.
半陆生蛞蝓 Gascoignella aprica Jensen 的 3D 显微解剖学,1985âa 基底斑鳃类 sacoglossan(腹足纲,Panpulmonata)
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