Onoba fuegoensis ( 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 : 54

Onoba fuegoensis ( Strebel, 1908)

Fig. 3G

Rissoa (Cingula?) fuegoensis Strebel, 1908: 56 , pl. 6, figs. 90a, b

Rissoa (Onoba) fuegoensis — Melvill & Standen, 1912: 124

Onoba fuegoensis — Ponder & Worsfold, 1994: 43, figs. 23e, f, 24a–c, 30 (protoconch and radula)

Examined material. 2 an. and 9 sh. (MACN-In 40672).

Description. Shell height to 2.5 mm (up to 3.05 mm according to Ponder & Worsfold 1994); elongate-conical, moderately solid. Protoconch large, of 1.75 convex whorls, microscopically sculptured. Teleoconch of up to 3.5 whorls, markedly convex in outline; last whorl comprising about 55% of total shell height. Suture impressed. Surface whitish, translucent in well preserved specimens; sculptured with 3 to 5 primary spiral cords per whorl, and 5 or 6 additional cords at the base; interspaces with delicate spiral threads. Aperture ovate, laterally expanded towards the base, interior white; columellar callus moderately thick, slightly reflected. Operculum ovate, paucispiral; yellowish, translucent.

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.