| Trochus firmus | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Vetigastropoda |
| Order: | Trochida |
| Superfamily: | Trochoidea |
| Family: | Trochidae |
| Genus: | Trochus |
| Species: | T. firmus |
| Binomial name | |
| Trochus firmus Philippi, 1849 [1] | |
| Synonyms [2] | |
| |
Trochus firmus is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. [2]
The size of the adult shell varies between 20 mm and 26 mm. The notably thick, solid shell has a rather conical shape. It is, transversely sulcate. It has a pale green ground, painted with close purple-red streaks above. The base has red-spotted girdles. The whorls are a little subangular above the suture and a little plicate below the sutures, appearing somewhat terraced. The body whorl is rounded-angulate and passes into the base with a blunt angle. The sculpture consists of about 7 weak smooth transverse grooves on the upper surface, and about 4 scarcely elevated concentric girdles on the base. The base of the shell is nearly plane, obsoletely cingulate and false-umbilicate. The funnel-shaped pit occupying the place of the umbilicus has a slightly elevated liration. The aperture is rhomboidal. The entirely simple columella is very oblique. [3]
This marine species occurs in the Persian Gulf.
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