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Halistylus
''Halistylus'' is a genus of very small sea snails, marine gastropod mollusks in the family Trochidae, the top snails. Description The small, polychromatic shell has a cylindrical shape. It is holostomatous, i.e. the aperture is rounded or entire, uninterrupted by the siphonal canal, notch, or by any other extension. The operculum is multispiral and coriaceous. There is no spiral sculpture. Such a cylindrical shape is rather uncommon in the family Trochidae The Trochidae, common name top-snails or top-shells, are a family of various sized sea snails, marine gastropod molluscs in the subclass Vetigastropoda. This family is commonly known as the top-snails because in many species the shell resembles .... But the belonging of this genus to this family is certified by the shell structure, the pearly aperture and anatomical features. This genus was previously considered a subgenus of the genus '' Cantharidus'' Montfort Species Species within the genus ''Halistylus'' include: * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Halistylus Pupoideus
''Halistylus pupoideus'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.Bouchet, P.; Rosenberg, G. (2012). ''Halistylus pupoideus'' (Carpenter, 1864). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=528714 on 2012-11-23 This species has been misspelled ''Halistylus pupoides'' in the 19th century literature. Description The shell grows to a length of 6 mm. This species occurs invariably with '' Caecum crebricinctum'' Carpenter, 1864. Both species have the same variantions in color. The very small shell is high-spired with a cylindrical shape. Its color varies between yellow to reddish-brown with some dark axial streaks. The slightly convex whorls are smooth, but show, under magnification, numerous, very fine spiral threads. This species shows great variations in strength and spacing of the spiral cords with, in some specimens, the major cords more prominent than norma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |