Odostomia, Fleming, 1813

Luca, Javier Di & Zelaya, Diego G., 2019, Gastropods from the Burdwood Bank (southwestern Atlantic): an overview of species diversity, Zootaxa 4544 (1), pp. 41-78 : 65

Odostomia sp. 1

Fig. 5G

Examined material. 5 sh. (MACN-In 40702).

Description. Shell height to 3 mm; fusiform, moderately solid. Protoconch markedly tilted, apex partially sunken; transition to teleoconch poorly defined. Teleoconch of up to 4.5 whorls, almost straight in outline; last whorl comprising about 65% of total shell height. Suture deep, impressed. Surface white; sculptured with a narrow spiral groove on the apical part of each whorl. Aperture ovate, slightly projected anteriorly, interior white; columella with a delicate fold (not visible in apertural view); callus moderately thick, slightly reflected on the umbilical area. Umbilicus partially closed in larger specimens, and completely closed in smaller ones.

Figures

FIGURE 5. A. Orbistestella ponderi Linse, 2002, MACN-In 40697, scale bar = 0.25 mm. B. Acteon biplicatus (Strebel, 1908), MACN-In 40698, scale bar = 1 mm. C. Neactaeonina argentina Zelaya, Schejter & Ituarte, 2011, MACN-In 40699, scale bar = 4 mm. D. Mathilda malvinarum (Melvill & Standen, 1907), MACN-In 40700, scale bar = 1 mm. E–F. Omalogyra burdwoodiana Strebel, 1908, MACN-In 40701, scale bar = 0.5 mm. E. Lateral view. F. Apical view. G. Odostomia sp. 1, MACN-In 40702, scale bar = 1 mm. H. Odostomia sp. 2, MACN-In 40703, scale bar = 1 mm. I. Odostomia sp. 3, MACN-In 40704, scale bar = 1 mm. J. Turbonilla strebeli Corgan, 1969, MACN-In 40705, scale bar = 1 mm. K. Diaphana paessleri (Strebel, 1905), MACN-In 40706, scale bar = 1 mm. L. Toledonia cf. elata Thiele, 1912, MACN-In 40708, scale bar = 1 mm. M. Toledonia cf. perplexa Dall, 1902, MACN-In 40707, scale bar = 1 mm. N. Toledonia sp., MACN-In 40709, scale bar = 1 mm.