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摘要:本文报道了采自广东惠州市东江支流(23°09′00. 31"N,114°22′26.59″E)的中国涡虫一新纪录目原卵黄目(Prolecithophora)斜口涡虫(Plagiostomum sp.)。该虫体长4.51 ~6.00 mm,体被不规则的褐色细网纹,头钝圆,尾圆锥形,体中部圆柱状,眼点4只。该涡虫运动...  相似文献   
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We analyzed the adult musculature of two prolecithophoran species, Cylindrostoma monotrochum (von Graff, 1882) and Monoophorum striatum (von Graff, 1878) using a phalloidin-rhodamine technique. As in all rhabdithophoran flatworms, the body-wall musculature consisted of three muscle layers: on the outer side was a layer of circular muscle fibers and on the inner side was a layer of longitudinal muscle fibers; between them were two different types of diagonally orientated fibers, which is unusual for flatworms. The musculature of the pharynx consisted of a basket-shaped grid of thin longitudinal and circular fibers. Thick anchoring muscle fibers forming a petal-like shape connected the proximal parts of the pharynx with the body-wall musculature. Male genital organs consisted of paired seminal vesicles, a granular vesicle, and an invaginated penis. Peculiar ring-shaped muscles were only found in M. striatum, predominantly in the anterior body part. In the same species, seminal vesicles and penis only had circular musculature, while in C. monotrochum also longitudinal musculature was found in these organs. Female genital organs were only present in M. striatum, where we characterized a vagina interna, and a bursa seminalis. Transverse, crossover, and dorsoventral muscle fibers were lacking in the middle of the body and greatly varied in number and position in both species.  相似文献   
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The epidermis of Friedmaniella sp. has been studied using light and electron microscopy. Three main morphological features characterize its cells, namely (1) DNA bodies in the nuclei, (2) an extensive Golgi apparatus with a well-developed system of transport vesicles, (3) clusters of centrioles mainly in the basal cytoplasm and axonemes and rootlets in the middle and apical cell parts. These peculiarities may indicate continuous physiological regeneration within the cell at the level of cell organelles. DNA bodies may prove to be a taxonomic feature distinguishing the Prolecithophora from other turbellarians.  相似文献   
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原卵黄目(Prolecithophora)柱口科(Cylindrostomidae)肠口涡虫属(Enterostomula)为海栖涡虫,全球记录3种,在中国未见报道。作者在广东省深圳市深圳湾海边(22°31'N,113°56'E)采集到一种海栖涡虫。本文对该种涡虫进行了较为详细的比较研究,鉴定为柱口科肠口涡虫属格氏肠口涡虫(E.graffi de Beauchamp,1913),为中国新纪录科新纪录属一新纪录种。该种涡虫多数个体背部具2条黑色横纹,部分个体背部花纹有明显变化。眼点2对。雌雄同体,精巢、卵巢各1个。受精囊位于卵巢与子宫之间;子宫位于体末端,后接一微小的外阴道。本文发现:①该涡虫的尾部腹面具有一个交配囊及一根雌性生殖管,交配囊是一个由肌肉层组成的袋状囊,同时与子宫、雌性生殖管相连;②雌性生殖管外围有明显的生殖腺包裹;③雌性生殖管孔、阴茎孔与口孔一起通往体外;④此种涡虫喜分泌黏液将微小杂质粘结呈半球状窝,虫体隐藏于窝内。  相似文献   
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