Antistreptus magellanicus Dall, 1902

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 : 54-55

Antistreptus magellanicus Dall, 1902

Fig. 3I

Antistreptus magellanicus Dall, 1902: 532 ; Dall, 1908: 315, pl. 15, fig. 14; Melvill & Standen, 1912: 128 (synonymy); Linse, 2002: 98, pl. 12, figs. 9.1.1-91, 9.1.1-92 (protoconch)

Examined material. 10 sh. (MACN-In 40681).

Description. Shell height to 4.1 mm (up to 5 mm according to Castellanos 1967); sinistral, fusiform, solid. Protoconch narrow, tilted, of 1.5 elongated, smooth whorls. Teleoconch of up to 3.25 whorls, markedly convex in outline; last whorl comprising about 70% of total shell height. Suture deep, impressed. Surface white; sculptured with 11 to 14 strong axial ribs and 2 or 3 spiral cords per whorl, which produce large beads at their intersections; base with 6 to 9 additional cords. Axial sculpture vanishing progressively towards the base. Aperture ovate, interior white; columellar callus thick; siphonal canal moderately long, somewhat 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.