Pleurotomella perpauxilla Watson 1881

Pleurotomella perpauxilla (Watson, 1881) (Figs. 44–46) Pleurotoma (Defrancia) perpauxilla Watson, 1881: 468. Clathurella perpauxilla (Watson, 1881): Watson (1886: 359, pl. XXII, fig. 7). Type material: Syntypes BMHN 1887.2. 9.1109 Type locality: West Indies, North of Culebra Island (18 º 38 ’ 30 ”N,...

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Bibliographic Details
Main Authors: Figueira, Raquel Medeiros Andrade, Absalão, Ricardo Silva
Format: Other/Unknown Material
Language:unknown
Published: 2012
Subjects:
Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Neogastropoda
Raphitomidae
Pleurotomella
Pleurotomella perpauxilla
Northwest Atlantic
Online Access:https://zenodo.org/record/5632989
https://doi.org/10.5281/zenodo.5632989
Description
Summary:Pleurotomella perpauxilla (Watson, 1881) (Figs. 44–46) Pleurotoma (Defrancia) perpauxilla Watson, 1881: 468. Clathurella perpauxilla (Watson, 1881): Watson (1886: 359, pl. XXII, fig. 7). Type material: Syntypes BMHN 1887.2. 9.1109 Type locality: West Indies, North of Culebra Island (18 º 38 ’ 30 ”N, 65 º 05’ 30 ”W), 713 m. Material examined: Type material and 18966 [2] OP I # 47; 18967 [1] OP I # 53; 18968 [1] OP I # 58; 18969 [1] OP I # 63; 18970 [1] OP I # 75; 18971 [1] OP I # 83; 18972 [4] OP I # 44; 18973 [2] OP II # 47; 18974 [1] OP II # 49; 18975 [1] OP II # 53; 18976 [4] OP II # 59; 18977 [1] OP II # 61; 18978 [1] OP II # 63; 18979 [1] OP II # 78; 15428 [3] OP I # 49; 17269 [2] OP II # 74. Description: Shell conical, white, up to 5.34 mm long. Protoconch with about 3.5 whorls. Protoconch 1 with rows of tiny crosses. Protoconch 2 with diagonal cancellation on the lower 2 / 3 of the whorls and axial riblets on the upper third. Clear-cut proto-teleoconch boundary. Teleoconch with a subsutural slightly concave area sculptured with several axial riblets and a spiral thread. Below this area, about 10 large oblique axial ribs (on the third whorl) crossed by two spiral cords. Shell surface granulose. Suture very shallow. Base elongated, ornamented with about 12 spiral cords. Inner lip reflected over parietal wall. Outer lip thin. Anterior siphonal canal relatively short and narrow. Aperture elliptical. Geographic distribution: Northwest Atlantic: West Indies (Watson, 1881; Watson, 1886). Southwest Atlantic: Campos Basin, Rio de Janeiro (this paper). Bathymetry: 713 m (Watson, 1881)– 1950 m (this paper). Discussion: Our material is almost identical to the type material of P. perpauxilla Watson, 1881 (fig. 46). Dall (1889: 116) synonymized this species with Mangilia ? elusiva Dall, 1881 (figured in Dall, 1889, pl. XII, fig. 7). Though we have not examined the type material of M. elusiva, the original illustration exhibits clear differences from P. perpauxilla (fig. 43). Dall’s specimen has a larger profile, more ...

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