“Genus Parabuccinum, new genus
Type species.–Chlanidota bisculpta Dell, 1990.
Description. Shell small for family, reaching 10.2-16.4 mm, depending on species. Shell relatively thick, solid, elongate or elongate-ovate in outline, spire high (about 0.33 to 0.5 SL). Spiral sculpture of thin to prominent low cords. Axial sculpture ranges from fine growth lines to prominent, sigmoidal, weakly prosocline ribs, depending on species. Aperture narrowly oval. Siphonal notch broad, slightly recurved dorsally, abaxial margin may form ridge along fasciole. Periostracum thin, smooth or finely hirsute, covering most of shell. Operculum large (0.53-0.60 AL), ovate, paucispiral, with nucleus rotated clockwise, nearly 180° along long axis of operculum. Proboscis of moderate length. Radular ribbon long, triserial. Rachidian tooth with 3 large cusps (central cusp largest) emerging from shallowly arched, straight-sided basal plate. Lateral teeth with 3 cusps, outer cusp longest, middle cusp shortest, closely adjacent to innermost cusp. Salivary glands small, fused. Valve of Leiblein well defined. Gland of Leiblein very small, tubular. Stomach broadly U-shaped, without caecum. Penis long, with flattened distal surface, bordered by thickened edge. Papilla long, cylindrical, situated in middle of distal surface, surrounded by very narrow circular fold at its base.
Remarks.—Conchologically, species of Parabuccinum somewhat resemble juvenile specimens of Chlanidota, but differ in having shells that are more slender and have a large, invariably well preserved protoconch, a relatively tall spire, and a very thin periostracum. In contrast, the protoconch of Chlanidota remains unknown, despite the large number of specimens (including juveniles <10 mm SL) that were studied (Harasewych & Kantor, 1999). Anatomically, Parabuccinum differs from Chlanidota in having a proportionally larger, paucispiral operculum, a very long and thin-walled siphon, a very small gland of Leiblein, a penis with a flattened distal surface with a thickened edge, and a stomach that overlies a portion of the esophagus.
There are some conchological similarities between this new genus and Buccinella jucunda (Thiele, 1912), which differs in having a prosiphiine radula (Thiele 1912: pl. 16, fig. 13) and an operculum with a terminal nucleus (pl. 13, fig. 20). Parabuccinum, especially P. eltanini, also resembles Neobuccinum eatoni (Smith, 1875) in general shell outline, operculum and protoconch morphology.
Parabuccinum is endemic to the Magellanic Province, and has a bathymetric range of 247 to 2165 m.”
(Harasewych, et al., 2000: 543-544)
Parabuccinum is a genus of sea snails, marine gastropod mollusks in the family Buccinulidae.[1]
Species within the genus Parabuccinum include:
Parabuccinum is a genus of sea snails, marine gastropod mollusks in the family Buccinulidae.
Parabuccinum is een geslacht van weekdieren uit de klasse van de Gastropoda (slakken).
Parabuccinum is een geslacht van weekdieren uit de klasse van de Gastropoda (slakken).
Parabuccinum là một chi ốc biển, là động vật thân mềm chân bụng sống ở biển trong họ Buccinulidae.[1]
Các loài thuộc chi Parabuccinum bao gồm:
Parabuccinum là một chi ốc biển, là động vật thân mềm chân bụng sống ở biển trong họ Buccinulidae.