Bulinus unifasciatus Sowerby I, 1833

Breure, Abraham S. H. & Ablett, Jonathan D., 2014, Annotated type catalogue of the Bulimulidae (Mollusca, Gastropoda, Orthalicoidea) in the Natural History Museum, London, ZooKeys 392, pp. 1-367 : 168

Bulinus unifasciatus Sowerby I, 1833 Figs 13A , L63iii

Bulinus unifasciatus Sowerby I 1833a: 37; Sowerby I 1833 [ Sowerby I and II 1832-1841]: fig. 55; Breure 1979: 72.

Bulimulus unifasciatus ; Pilsbry 1897 [1897-1898]: 117, pl. 23 fig. 27.

Naesiotus unifasciatus ; Breure and Coppois 1978: 188 (lectotype designation); Breure and Borrero 2008: 17.

Type locality.

[Ecuador] "ad Insulas Gallapagos".

Label.

"Charles Id / Galapagos", in E.A. Smith’s handwriting.

Dimensions.

"long. 0.8, lat. 0.45 poll. [H 20.3, D 11.4 mm]"; figured specimen herein H 20.4, D 11.1, W 6.3.

Type material.

NHMUK 1975187, lectotype; 1975188, one paralectotype (Cuming coll.).

Remarks.

Sowerby described this taxon from the collection of H. Cuming; he specified ”Charles’s Island", currently called Isla San Cristóbal. E.A. Smith, as curator of the collection, considered this probable type material; its status is here not disputed. The paralectotype (H 22.0, D 11.06, W 6.7) is better preserved and shows the characteristic pale band along the periphery of the last whorl.

Current systematic position.

Bulimulidae , Naesiotus unifasciatus (Sowerby I, 1833).

Figures

Figure 13. Naesiotus species. A Naesiotus unifasciatus (Sowerby I, 1833), lectotype NHMUK 1975187 (H = 20.4) B-E Naesiotus jacobi (Sowerby I, 1833) B possible syntype NHMUK 1842.5.10.250 (H = 11.9) C sculpture on dorsal side of ultimate whorl D syntype of Bulimulus (Naesiotus) pallidus Reibisch, 1892 NHMUK 1894.5.8.3 (H = 11.37) E sculpture on dorsal side of (pen) ultimate whorl F Naesiotus albemarlensis Dall, 1917, possible paratype NHMUK 1937.6.18.13 (H = 14.5) G-H Naesiotus curtus (Reibisch, 1892), syntype NHMUK 1894.6.8.8 (H = 9.6) H sculpture on dorsal side of (pen) ultimate whorl I Naesiotus perspectivus (Pfeiffer, 1846), lectotype NHMUK 1975166 (H = 15.7) J Naesiotus darwini (Pfeiffer, 1846), possible syntype NHMUK 20100523 (H = 8.64). All enlarged.

Figure L 63. Labels. i Bulimus umbilicaris Souleyet, 1842 ii Bulimus umbricatus Reeve, 1849 iii Bulinus unifasciatus Sowerby I, 1833 iv Bulinus ustulatus Sowerby I, 1833 v Bulimus varicosus Pfeiffer, 1853 vi Bulimulus (Naesiotus) ventrosus Reibisch, 1892.