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Pseudopusula geigeri Fehse & Grego, 2014

říše Animalia - živočichové »  kmen Mollusca - měkkýši »  třída Gastropoda - plži »  řád Littorinimorpha »  čeleď Triviidae - triviovití »  rod Pseudopusula

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Pseudopusula geigeri

Autor: Fehse & Grego

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Popis

Shell between 8 and 12 mm in length, lightweight, solid and ovate. Spire covered by callus. Body whorl sub-triangular, slightly inflated and rounded, about 80% of total height, with both terminals slightly produced. Anterior terminal tip slightly indented, posterior tip blunt. Dorsum profile roundly elevated, completely covered by ribs -about 12 on average - with an incised sulcus mid-dorsally that depresses the ribs. Dorsal sulcus short. Ventrum slightly convex with recurved terminals. Aperture narrow over its entire length widened only barely at the fossular section. Aperture slightly curved. Labrum roundly callused, narrow, slightly curved, keeled towards its inner margin. Outer labral margin roundly callused. Labrum bears on its inner margin an average of 14 fine denticles. Siphonal and anal canals follow the shell profile. Columella slightly curved, narrow, and tapering almost vertically inwards. Parietal lip sinuous, slightly keeled, crossed by an average of 13 ribs. Fossula concave and not clearly delimited from the rest of the columella. Inner fossular edge slightly protruded. Shell colour dark brown with an even darker, more brilliant brown patch on mid-dorsum. Dorsal sulcus brownish white. Ventrum somewhat darker shell colour. Dorsal ribs of lighter colour, ventral ribs brownish white. Inner labral edge; both canals, columella, and fossula greyish white.

VARIATIONS
The shells look very uniform. The terminals vary only slightly in their length. Sometimes the dorsal ribs possess nodules on both sides of the sulcus. L = 8 - 12, W = 74 - 82 % of length, LT = 13 - 16, CT= 12- 14, RR = 12- 14; data based on 11 specimens.
Fehse D & Grego J - 2014 - Revision of the genus Pusula (Mollusca Gastropoda Triviidae)

Rozšíření

Keen (1958: 332) noted, "[North] California to Acapulco, Mexico."
Mexico: Bahia San Luis Gonzaga; Ensenada Blanca, Puertecitos, Penasco - Baja California Norte; Punta Colorado; Isla Magdalena, Puerto San Carlos - Baja California Sur; Cape Pepola -Sonora.
U.S.A.: Anacapa Island and Santa Cruz Island, N Santa Barbara Channel Islands, California (Glass & Foster, 1986: 2). La Daz Conception Bay; Channel Jetty, Mission Bay, San Diego; Reef Point, Orange County - California and the type locality; and the type locality.
Fehse D & Grego J - 2014 - Revision of the genus Pusula (Mollusca Gastropoda Triviidae)

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