Newtoniellidae, Korobkov, 1955

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 : 52

Newtoniellidae sp. 2

Fig. 3C

Examined material. 7 sh. (MACN-In 40679).

Description. Shell height to 6 mm; turritelliform, moderately solid. Protoconch small, of 3 convex whorls, the first smooth, two others sculptured with about 25 closely arranged axial threads per whorl. Teleoconch of up to 7.25 whorls, slightly convex in outline; last whorl comprising about 40% of total shell height. Suture impressed. Surface white; sculptured with 20 to 24 low axial ribs and 3 to 5 spiral cords per whorl, which produce small beads at their intersections; base sculptured with one strong and one or two narrower, smooth cords; the former delimiting the base. Aperture subquadrate, interior white; columellar callus narrow; siphonal canal extremely short, markedly oblique, wide.

Figures

FIGURE 3. A. Eumetula cf. dilecta Thiele, 1912, MACN-In 40680, scale bar = 1 mm. B. Newtoniellidae sp. 1, MACN-In 40678, scale bar = 1 mm. C. Newtoniellidae sp. 2, MACN-In 40679, scale bar = 1 mm. D. Trochita pileolus (d´Orbigny, 1841), MACN-In 40669, scale bar = 2 mm. E. Eatoniella denticula Ponder & Worsfold, 1994, MACN-In 40670, scale bar = 1 mm. F. Tectonatica impervia (Philippi, 1845), MACN-In 40671, scale bar = 2 mm. G. Onoba fuegoensis (Strebel, 1908), MACN-In 40672, scale bar = 1 mm. H. “Anomacme” multituberculata Castellanos, Rolán & Bartolotta, 1987, MACN-In 40682, scale bar = 1 mm. I. Antistreptus magellanicus Dall, 1902, MACN-In 40681, scale bar = 1 mm. J. Microdeuthria michaelseni (Strebel, 1905), MACN-In 40684, scale bar = 2 mm. K. Pareuthria fuscata (Bruguière, 1789), MACN-In 40683, scale bar = 5 mm.