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Minioniella heleneae Fraussen & Stahlschmidt, 2016

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Minioniella heleneae

Autor: Fraussen & Stahlschmidt

Taxon v check-listech zemí*

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Popis

Shell small, thin but solid; shape biconical, moderately broad with low, conical spire; base constricted with weakly stretched base. Protoconch high, consisting of 1,5 laterally flattened whorls with sharp angulation forming broad, flat subsutural platform; tip rather papilliform, first whorl high, last ½ whorl about 3/5 times narrower than first whorl. Transition to teleoconch distinct, marked by fine line.
Teleoconch consisting of 4,25 whorls, laterally flattened on spire, ornamented with dominant axial ribs crossed by fine spiral cords, interspaces covered by fine but sharp incremental lines. First whorl with 2 fine, sharp spiral cords, interspaces broad, a third spiral cord partly concealed under suture of subsequent whorl. Second whorl with 3 primary spiral cords, a fine secondary spiral cord appearing in middle of adapical interspace. This secondary spiral cord gradualy increasing in strenght, on third whorl almost as strong as primary spiral cords. Penultimate whorl with 4 primary spiral cords, interspaces broad with a fine, obscure secondary spiral cord. Body whorl with 18 spiral cords of different strenght, interspaces broad. All spire whorls with 12 sharp, pronounced axial ribs, interspaces twice as broad. Body whorl with 10 axial ribs, including broad labral varix. Aperture semi-oval, columella weakly concave, parietal concave, parietal knob absent or weak, anal notch broad but weak, anal knob weak, the whole forming a smooth running curve along columella and adapical part of aperture. Columella with a single columellar knob, on transition to siphonal canal with 2 small columellar folds. Outer lip concave; inside with 4 knobs, adapical one largest, sharp, gradually becoming smaller towards siphonal canal. Siphonal canal short, straight, open, narrow.
Fraussen K. & Stahlschmidt P. (2016). Revision of the Clivipollia group (Gastropoda: Buccinidae: Pisaniinae) with description of two new genera and three new species.

Možné záměny

Minioniella heleneae sp. nov. is characterized by the angular protoconch whorls, the dominant axial sculpture in combination with moderately fine spiral cords, the fine but sharp axial incremental lines, the round aperture looking not unfamiliar for Muricidae with few denticles only, the orange colour with pinkish upper spire and the small size.
Fraussen K. & Stahlschmidt P. (2016). Revision of the Clivipollia group (Gastropoda: Buccinidae: Pisaniinae) with description of two new genera and three new species.

Rozšíření

Pacific, French Polynesia, Tuamotu Islands, Moruroa Atoll, beach.
Fraussen K. & Stahlschmidt P. (2016). Revision of the Clivipollia group (Gastropoda: Buccinidae: Pisaniinae) with description of two new genera and three new species.

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