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Ficidae, common name the fig shells are a family of medium to large marine gastropods. It is the only family in the superfamily Ficoidea. According to taxonomy of the Gastropoda by Bouchet & Rocroi (2005) the family Ficidae has no subfamilies. The shells of these snails are shaped rather like figs or pears, hence the common name.
The shell may vary in color and pattern. The shell has a reticulate (= net-like) structure with strong radial ribs and lacks an operculum. The shell ranges from 3 mm to 13.2 cm. The great keyhole limpet (Megathura crenulata) measures up to 13.2 cm. For respiration, the shells of fissurellids have a single apical or subapical perforation ...
Bernard Tursch, Dietmar Greifeneder - Oliva shells: the genus Oliva and the species problem; Graham Saunders - Spotters Guide to Shells; Angeline Myra Keen - Sea Shells of Tropical West America - Stanford University Press, 1971; Jerome M. Eisenberg - Collector's guide to Seashells of the World; A. Robin - Encyclopedia of Marine Gastropods
Instead, a segmented shell gland forms on one side of the larva, and a foot forms on the opposite side. When the larva is ready to become an adult, the body elongates, and the shell gland secretes the plates of the shell. Unlike the fully grown adult, the larva has a pair of simple eyes, although these may remain for some time in the immature ...
Their slender shell is elongated with a pointed spire. They vary in size from 3 mm (Bittium alternatum) to 150 mm (Cerithium nodulosum). The smallest shells are found in the subfamily Bittiinae. The many whorls have radial sculpture with axial ridges and nodules. The aperture shows at its base a vague curve or a distinct siphonal canal.
The shells are small to rather large (diameter of base without attachments 19–160 mm; height of shell 21–100 mm), depressed to conical, with narrow to wide, simple to spinose peripheral edge or flange separating spire from base. Aperture large, base broad, rather flattened, often umbilicate. Periostracum very thin or wanting.
The shell has a trochoidal shape. It is nacreous within. It is umbilicate or imperforate, having a deep slit or sinus in the outer superior margin of the peristome, which serves the purpose of an exhalant phase of respiration., and leaves on the corresponding part of the whorls a peculiarly sculptured band, the "anal fasciole" or the "slit fasciole."
The color of the Melo amphora shell is said to be highly variable. It is commonly mainly coloured brown, white, or pale orange. It is commonly mainly coloured brown, white, or pale orange. It usually presents spiral darker brown banding.