Orbitestella ponderi Linse, 2002

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 : 62

Orbitestella ponderi Linse, 2002

Fig. 5A

Orbitestella ponderi Linse, 2002: 82 , pl. 9a, figs. 9.1.1 65–68, pl. 9b, figs. 9.1.1 69–72 (protoconch and radula)

Examined material. 1 an. and 13 sh. (MACN-In 40697).

Description. Shell width to 0.7 mm (up to 1.04 mm according to Linse 2002); discoidal, with spire only slightly raised; delicate. Protoconch of 1.25 bulbous whorls. Teleoconch of up to 2 whorls, markedly convex in outline, with straight shoulder. Suture deep, slightly channeled. Surface white; sculptured with 19 to 24 strong, markedly prosocline, axial ribs per whorl; interspaces with numerous spiral threads. Aperture rounded, interior white. Umbilicus wide, rounded. Operculum rounded, multispiral; pale brown, translucent.

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.