Acteon biplicatus ( Strebel, 1908 )

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

Acteon biplicatus ( Strebel, 1908)

Fig. 5B

Odostomia biplicata Strebel, 1908: 65 , pl. 1, figs. 9, 9a

Actaeon biplicatus — Castellanos & Landoni, 1986: 297, fig. 13

Examined material. 1 an. and 38 sh. (MACN-In 40698).

Description. Shell height to 5.5 mm; elongate-conical, delicate. Protoconch large, smooth, of about 1.75 slightly convex whorls; transition to teleoconch poorly defined. Teleoconch with up to 4 whorls, slightly convex in outline; last whorl comprising about 70% of total shell height. Suture deep, slightly channeled. Surface brownish, with a pale band below suture; only sculptured with faint growth lines. Aperture ovate, interior pale brown; columella with two small folds, callus moderately thick, slightly expanded over the umbilical area.

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.