THE ANATOMY OF MELANODRYMIA-AURANTIACA HICKMAN, A COILED ARCHAEOGASTROPOD FROM THE EAST PACIFIC HYDROTHERMAL VENTS (MOLLUSCA, GASTROPODA)
THE ANATOMY OF MELANODRYMIA-AURANTIACA HICKMAN, A COILED ARCHAEOGASTROPOD FROM THE EAST PACIFIC HYDROTHERMAL VENTS (MOLLUSCA, GASTROPODA)
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DOI：
10.1111/j.1463-6395.1989.tb01068.x
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发表时间：
1989-09-01
期刊：
影响因子：
1.2
通讯作者：
HASZPRUNAR, G
中科院分区：
文献类型：
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作者：
HASZPRUNAR, G
描述了东太平洋热液喷口盘状古腹足类Melanodrymia aurantiaca Hickman，1984的解剖结构。大的原海螺有网状的雕刻，没有次级幼虫壳，二梳状鳃缺乏骨杆，鞭状舌状褶皱，特别是具有脚索的节肢下神经系统反映了始祖腹足的组织水平，单瓣器官，单片心脏，单肾，腺性生殖管和内部受精，阴茎(雄性)和受精器(雌性)类似于较高的链球藻属的条件。然而，后一种相似之处被认为是趋同。原始和高级特征的独特组合以及特定的特性(如神经性二形性)阻止了将橙色黑眼莲列入任何已知的考古足类群。根据口吻形成的相似性和相似的腹足类型，最近描述的其他几种考古腹足动物(腹足总科)可能与橙色腹足动物有亲缘关系。
The anatomy of Melanodrymia aurantiaca Hickman, 1984, a coiled archaeogastropod from the East Pacific hydrothermal vents, is described based on reconstructions of paraffin and semi-thin sections series. Whereas the large protoconch with net-like sculpture and the lack of a secondary larval shell, the bipectinate gill lacking skeletal rods, the rhipidoglossate rasdula and in particular the hypoarthroid nervous system with pedal cords reflect an archaeogastropod level of organization, the single set of pallial organs, the monotocard heart, the single left kidney, the glandular gonoduct and internal fertilization indicated by penis (males) and receptaculum (females) resemble conditions of higher streptoneurans. The latter similarities are regarded as convergences, however. The unique combination of primitive and advanced features as well as specific peculiarities (e.g. neural sexual dimorphism) prevents an inclusion of Melanodrymia aurantiaca in any of the known archaeogastropod groups. Based on similarity of snout formation and similar radula type several other recently described archaeogastropods (Peltospiroidea) are possibly related to M. aurantiaca.