| 词条 | Phorcus atratus |
| 释义 |
| taxon = Phorcus atratus | image = Phorcus atratus 01.JPG | image_caption = A shell of Phorcus atratus | authority = (Wood, 1828) | synonyms_ref = [1] | synonyms =
| display_parents = 3 }}Phorcus atratus is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.[1][2] DescriptionThe height of the shell varies between 17 mm and 24 mm, its diameter between 16 mm and 19 mm. The solid, imperforate shell has a conical shape. The spire is conical. The apical whorls are eroded, the following dull cinereous or purplish-black, marked with several spiral rows of white spots, or with longitudinal zigzag white stripes. The base of the shell is generally tessellated or striped with white. The shell contains 5 to 6 whorls. The upper ones are marked with spiral impressed lines in young specimens, and two carinae, the latter giving the body whorl a squarish form. The aperture is oblique. The lip is not much thickened within. The short columella is obsoletely subdentate at its base. Above at the insertion it shows a heavy white callous spread upon the base, invading the umbilicus, and wholly closing it, or leaving only a narrow pit. This species is quite variable in coloration, the white appearing either in oblique zigzags or in spots. The young are perforate.[3] DistributionThis marine species occurs in the following locations:[1]
References1. ^1 2 {{WRMS species|689175|Phorcus atratus (Wood, 1828)||18 December 2018}} 2. ^Donald K.M., Preston J., Williams S.T., Reid D.R., Winter D., Alvarez R., Buge B., Hawkins S.J., Templado J. & Spencer H.G. 2012. Phylogenetic relationships elucidate colonization patterns in the intertidal grazers Osilinus Philippi, 1847 and Phorcus Risso, 1826 (Gastropoda: Trochidae) in the northeastern Atlantic Ocean and Mediterranean Sea. Molecular Phylogenetics and Evolution, 62(1): 35–45 3. ^[https://archive.org/details/manualofconcholo111tryo Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia] (described as Monodonta tamsi)
External links
6 : Phorcus|Molluscs of the Atlantic Ocean|Molluscs of the Canary Islands|Gastropods of Cape Verde|Invertebrates of West Africa|Gastropods described in 1828 |
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