Four palaeonemerteans (Nemertea: Anopla) from a tidal flat in middle Honshu, Japan
Four palaeonemerteans (Nemertea: Anopla) from a tidal flat in middle Honshu, Japan
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DOI：
10.11646/zootaxa.1163.1.1
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发表时间：
2006-03
期刊：
影响因子：
0.9
通讯作者：
H. Kajihara
中科院分区：
文献类型：
--
作者：
H. Kajihara
本文报道了四种古两栖动物，包括隆凸脊鱼Carinina plecta sp. nov.，nov.，井壶菌和Hubrechtella kimurvanum sp. nov.，分布于日本本州岛的太平洋沿岸。Coeia Takakura，1922被认为是Hubrechtella Bergendal，1902的主观初级异名。隆凸（Carinina plecta sp. nov.）与其他同类的区别在于，它具有一个主要由圆形和纵向肌纤维交织而成的喙腔壁，这一特征与另一个古动物属Carinoma以及Hoplonemertea的某些成员相似。nov.在长鼻中具有一个显著的针状器官，这是在其他古动物中从未报道过的特征。Hubrechtella（= Coeia）ijimai comb. nov.的特征“尾巴”可以被认为是一种只出现在其他同类幼鱼中的结构的异时保留。在分叉成血管丛之前，在前肠区域有一个宽的U形血陷窝。
Four species of palaeonemerteans, including Carinina plecta sp. nov., Callinera nishikawai sp. nov., Hubrechtella ijimai comb. nov., and Hubrechtella kimuraorum sp. nov., are described from the Pacific coast of Honshu Island, Japan. The genus Coeia Takakura, 1922 is considered to be a subjective junior synonym of Hubrechtella Bergendal, 1902. Carinina plecta sp. nov. can be distinguished from other congeners by possessing a rhynchocoel wall principally composed of interwoven circular and longitudinal muscle fibres, a condition similar to that in another palaeonemertean genus, Carinoma, as well as certain members in the Hoplonemertea. Callinera nishikawai sp. nov. possesses a remarkable stylet-like apparatus in the proboscis, a feature that has never been reported for any other palaeonemertean. The characteristic ‘tail’ in Hubrechtella (= Coeia) ijimai comb. nov. can be regarded as a heterochronic retention of the structure that appears only in juveniles of other congeners. Hubrechtella kimuraorum sp. nov. has a broad U-shaped blood lacuna in the foregut region before it ramifies into a vascular plexus.