Diaphana paessleri (Strebel, 1905)

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 : 66

Diaphana paessleri (Strebel, 1905)

Fig. 5K

Utriculus paessleri Strebel, 1905b: 577 , pl. 22, figs. 34, 34a

Diaphana paessleri — Schiøtte, 1998: 90, figs. 9–10, 11a–i, 19e (holotype, synonymy, protoconch and radula)

Examined material. 1 an. and 8 sh. (MACN-In 40706).

Description. Shell height to 3 mm (up to 3.3 mm according to Schiøtte 1998); ovate, delicate. Protoconch tilt, translucent in well-preserved specimens, of 1.25 markedly convex whorls. Teleoconch of up to 2 whorls, slightly convex in outline, with prominent shoulder; last whorl comprising about 85% of total shell height. Suture deep, slightly channeled. Surface white; only sculptured with faint growth lines. Aperture elongate-ovate, interior white; columellar callus narrow, expanded over the umbilical area. Umbilicus open, narrow, delimited by a thin rim.

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.