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Fusidaphne
''Pleurotomella'' is a genus of sea snails, marine gastropod mollusks in the family Raphitomidae. Description (Original description by Verrill) As at present understood, this genus is intended to include those species which have a rather broad and very distinct subsutural band, crossed by excurved lines of growth corresponding to the form of the posterior sinus of the lip, which is situated a little below the suture and is always pretty well-developed, but is sometimes broad and shallow, and at other times narrower and very deep. The outer lip is always thin and sharp, without any appearance of a varix, nor is there any deposit of callus on the body whorl, in front of the aperture. The siphonal canal is well developed, generally constricted at the base and somewhat elongated, and usually but slightly curved. In a few of the species, doubtfully referred to hie genus, it is short and wide. The columella-margin is more or less sinuous. The protoconch differs in sculpture, and usua ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Raphitomidae
Raphitomidae is a family of small to medium-sized sea snails, marine gastropod mollusks in the superfamily Conoidea.Bouchet P. & Rocroi J.-P. (Ed.) (2005). "Classification and nomenclator of gastropod families". ''Malacologia'' 47(1-2). . 397 pp. Bouchet, Kantor ''et al''. elevated in 2011 the subfamily Raphitominae (which at that point had been placed in the family Conidae) to the rank of family. This was based on a cladistical analysis of shell morphology, radular characteristics, anatomical characters, and a dataset of molecular sequences of three gene fragments. The family was found to be monophyletic. Description The Raphitomidae is the largest, most diverse and most variable taxon in the Conoidea, with the greatest number of species and the largest ecological range (from the tropics to the pole) and largest vertical range (intertidal to hadal depths). The shells of species in the Raphitomidae are very variable in shape (buccinoid to ovate, elongate-fusiform, or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleurotomella Circumvoluta
''Pleurotomella circumvoluta'' is a species of sea snail, a marine gastropod mollusk in the family (biology), family Raphitomidae. Description The shell grows to a length of 12 mm. The shell has a strong superficial resemblance to ''Glyphostoma gratula'' (Dall, 1881), but with a totally different protoconch, and with differences in details of Sculpture (mollusc), sculpture. It also has not the minute punctation. The color of the shell is white or ashy gray. The protoconch and its whorls are heliciform, with a sculpture of slightly raised lamellae waved backward from the middle point of the periphery both ways. Under these are also fine revolving raised lines. The shell contains 9 Whorl (mollusc), whorls. The remainder show a transverse sculpture of from sixteen to (on the body whorl) eighteen narrow raised riblets passing entirely over the whorls, quite faint on the band and only obsolete on the Columella (gastropod), columella and the siphonal canal. Beside these the lines ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
