| 词条 | Mangelia subcircularis |
| 释义 |
| taxon =Mangelia subcircularis | image = | image_caption = | authority = W.H. Dall, 1927 | synonyms_ref = | synonyms = Mangilia subcircularis Dall, 1927 | display_parents = 3 }}Mangelia subcircularis is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.[1] DescriptionThe length of the shell attains 8 mm, its diameter 2.7 mm. (Original description) The small, slender, thin shell has a blunt apex. It is whitish and glistening. It shows a swollen protoconch of 1½ whorl and 4½ subsequent well rounded whorls. The suture is distinct, appressed, with a smooth, hardly constricted fasciole in front of it. The axial sculpture consists chiefly of rather strong flexuous incremental lines and a few gradually obsolescent riblets on the earlier whorls. The spiral sculpture consists of (on the body whorl 18-20) fine prominent threads rising above the incremental lines, with wider interspaces, covering the whole whorl in front of the fasciole;. The aperture is ovate, measuring about⅓ the whole length. The anal sulcus forms nearly a semicircle. The outer lip is thin and arcuate. The siphonal canal is wide. The columella is twisted, attenuated in front; axis impervious.[2] DistributionThis marine species was found off Georgia, USA. References1. ^{{WRMS species|434354|Mangelia sagena (Dall, 1927)||9 August 2011}} {{Include-USGov|agency=Smithsonian Institution}}2. ^[https://archive.org/details/proceedingsofuni701927unit Dall W. H. (1927). Small shells from dredgings off the southeast coast of the United States by the United States Fisheries Steamer "Albatross", in 1885 and 1886; Proceedings of the United States National Museum, 70(18): 1-134] {{PD-notice}} External links
2 : Mangelia|Gastropods described in 1927 |
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