3D- microanatomy of the semiterrestrial slug Gascoignella aprica Jensen, 1985—a basal plakobranchacean sacoglossan (Gastropoda, Panpulmonata)
3D- microanatomy of the semiterrestrial slug Gascoignella aprica Jensen, 1985—a basal plakobranchacean sacoglossan (Gastropoda, Panpulmonata)
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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）
DOI：
10.1007/s13127-013-0142-6
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发表时间：
1985
影响因子：
1.6
通讯作者：
Schrödl
中科院分区：
文献类型：
--
作者：
Kohnert;Brenzinger;Jensen;Schrödl
单系的panpulmonate，通常是海洋底栖Sacoglossa和它的基础划分为带壳Oxynoacea和无壳Plakobranchacea是无可争议的，但家庭的关系是值得怀疑的。特别令人感兴趣的是潜在的基础plakobranchacean家庭Platyhedylidae，包括形态异常的成员缺乏头触角或身体附属物。本文对该属的模式种Gascoignella，G. Jensen，1985年，来自香港。使用Amira软件从连续半薄切片通过三维重建产生形态学数据。我们的显微解剖结果在很大程度上证实了最初的描述。前消化系统是囊舌样的，但经过了修改，例如，咽囊没有外部分界，缺乏咽囊。消化腺二分，有两个分支，由一个纵向的、肌肉的、中间的隔膜分开，但在后端融合。位于咽后的神经环包含融合的胸膜神经节;短的内脏环有三个神经节。两个主要的脑神经被确定为神经鞘和唇触手神经，支配感觉区的头velum.Gascoignella的Gascoignella的是一个雌雄同体的真正androdiaulic生殖系统，其中一些原来模棱两可的字符被澄清。囊和前列腺插入受精室，靠近囊状蛋白腺和管状粘液腺。头部交配器包含一个阴茎武装与短而直的针和附属腺的功能不明确，精子转移的假定模式进行了讨论。发育良好的心脏和一个大的H形肾脏;肾管通向肠道。表皮腺体和身体组织是第一次描述。存在一个独特的纵向，中间的隔膜被认为是诊断的Platyhedylidae，多个进一步的apomorphies给出。形态学证据支持分子系统发育假说，即扁海蛇科可能是一个基部无壳囊舌动物谱系。
The monophyly of the panpulmonate, usually marine benthic Sacoglossa—and its basal division into shelled Oxynoacea and shell-less Plakobranchacea—is undisputed, but family relationships are in doubt. Of particular interest is the potentially basal plakobranchacean family Platyhedylidae, comprising morphologically aberrant members lacking head tentacles or body appendages. Herein we re-describe the type species of the genusGascoignella,G. apricaJensen, 1985, from Hong Kong. Morphological data was generated by three-dimensional reconstruction from serial semi-thin sections using Amira software. Our microanatomical results largely confirm the original description. The anterior digestive system is sacoglossan-like but modified, e.g. the ascus is not demarcated externally and pharyngeal pouches are lacking. The digestive gland is bipartite, with two rami separated by a longitudinal, muscular, median septum, but fused in the rear end. The postpharyngeally situated nerve ring contains fused cerebropleural ganglia; the short visceral loop has three ganglia. Two major cerebral nerves were identified as rhinophoral and labiotentacular nerves, innervating sensory areas on the head velum.Gascoignella apricais a hermaphrodite with a truly androdiaulic genital system of which some originally ambiguous characters are clarified. Bursa and prostate insert into a fertilization chamber proximal to a sac-like albumen gland and a tubular mucus gland. The cephalic copulatory apparatus contains a penis armed with a short and straight stylet and an accessory gland of unclear function; the presumed mode of sperm transfer is discussed. A well-developed heart and a large H-shaped kidney are present; the nephroduct opens into the intestine. Epidermal glands and body tissues are described for the first time. The presence of a unique longitudinal, median septum is considered diagnostic for Platyhedylidae, multiple further apomorphies are given. Morphological evidence supports the molecular phylogenetic hypothesis that the Platyhedylidae could be a basal non-shelled sacoglossan lineage.
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DOI：
--
发表时间：
2009
期刊：
影响因子：
--
作者：
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通讯作者：
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影响因子：
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作者：
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作者：
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通讯作者：
K. Jensen
影响因子：
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作者：
Neusser TP;Jörger KM;Schrödl M
通讯作者：
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作者：
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通讯作者：
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