Leptogyra bujnitzkii Krol & Nekhaev 2020

• Main Authors: Krol, Ekaterina N., Nekhaev, Ivan O.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2020
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Gastropoda; Neomphalida; Melanodrymiidae; Leptogyra; Leptogyra bujnitzkii; Arctic; Arctic Ocean; Lomonosov Ridge
• Online Access: https://doi.org/10.5281/zenodo.3810491; http://treatment.plazi.org/id/03A58791FFB1FF98FF212EEDCCA42E5F

Leptogyra bujnitzkii (Gorbunov, 1946) (Figure 1) Ganesa bujnitzkii Gorbunov, 1946b: p. 309, pl. 1, fig. 1a–b, v. Skenea bujnitzkii : Kantor & Sysoev 2006: p. 40, pl. 18D. Type material. 2 syntypes, R / V Sadko, det. Gorbunov, 24.07.1938, sta. 101, trawl, Zoological Institute of Russian Academy of Sciences No 1908/1. Type locality. Arctic Ocean, slope of Lomonosov Ridge, 81°50’N, 136°14’E, 3,700–3,800 m. Diagnosis. Leptogyra Bush, 1897 with skeneiform shell, thin sigmoidal growth lines, wide spiral wrinkles, wide, deep umbilicus. Central tooth of radula wide, rectangular, first three lateral teeth similar, fourth lateral tooth rather large, numerous filamentous marginal teeth. Description. Shell small (maximal shell width 3.15 mm), skeneiform, light brownish with convex rounded whorls, suture deep, periphery of penultimate whorl rounded, convex. Teleoconch surface with thin numerous sigmoidal growth lines, spiral sculpture consists of wide wrinkles (Fig. 1A, E). Almost whole surface of embryonic shell covered with irregular network sculpture, only narrow part near protoconch border smooth (Fig. 1 C–D). Aperture rhomboid with rounded angles. Umbilicus wide, deep. Periostracum, operculum and soft body unknown. According to original description operculum consist of four whorls in larger specimen, of three whorls in smaller specimen (Gorbunov 1946b). Radula (Fig. 1 F–G). n -4-1-4- n . Central tooth poorly visible on preparation, wide, rectangular, with thin cutting edge without distinct cusps. Three inner lateral teeth uniform, narrow, with small triangular cutting edge, outer lateral large, with single relatively small triangular cutting edge. Marginal teeth numerous, thin, filamentous. Measurements of syntype 1: shell height 2.45 mm, body whorl height 2.20 mm, aperture height 1.45 mm, shell width 3.15 mm, aperture width 1.65 mm, diameter of protoconch 308 µm, diameter of the initial part of protoconch 67 µm, number of whorls 3.4, number of protoconch whorls 0.7. Measurements of syntype 2: shell height 2.30 mm, ...