Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Classis: Gastropoda
Subclassis: Vetigastropoda
Ordo: Trochida
Superfamilia: Trochoidea
Familia: Tegulidae
Genus: Tegula
Species: Tegula excavata
Tegula excavata, common name the green-based tegula, is a species of sea snail, a marine gastropod mollusk in the family Tegulidae.[1]
Description
The height of the shell varies between 12 mm and 18 mm. The umbilicate shell has a conical shape. It is dull grayish, olivaceous or pinkish, longitudinally lineolate with a darker shade, frequently appearing unicolored. The spire is conic. The apex is eroded or acute. The 6 to 7 whorls are flattened, scarcely convex, very obsoletely spirally grooved. The body whorl is acutely carinated at the periphery, flat or plano-concave beneath, concentrically lirate. The large aperture is subhorizontal, iridescent within. The columella is sinuous, unidentate in the middle, green, half surrounding the umbilicus with a sickle-shaped callus. The umbilicus is funnel-shaped, green or white within, broadly expanding at its opening.[2]
Five views of a shell of Tegula excavata
Distribution
This species occurs in the Gulf of Mexico, the Caribbean Sea and the Lesser Antilles.
References
Tegula excavata (Lamarck, 1822). Retrieved through: World Register of Marine Species on 20 April 2010.
Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia (described as Chlorostoma excavatum)
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