Tectonatica impervia (Philippi, 1845)

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 : 53

Tectonatica impervia (Philippi, 1845)

Fig. 3F

Natica impervia Philippi, 1845a: 65 ; Philippi, 1845b: 42, pl. 33, fig. 6; Melvill & Standen, 1912: 122 Tectonatica impervia — Dell, 1990: 163, figs. 249, 274 (synonymy and radula); Pastorino, 2005b: 231, figs. 36–45 (synonymy and radula)

Examined material. 4 sh. (MACN-In 40671)

Description. Shell height to 11.3 mm (up to 18.1 mm according to Dell 1990); ovate, solid. Protoconch of about 1 whorl; transition to teleoconch poorly defined. Teleoconch of up to 3.25 whorls, almost straight in outline; last whorl enlarged, very inflated, comprising about 95% of total shell height. Suture impressed. Surface whitish; only sculptured with faint growth lines. Aperture elongate-ovate, interior white; columellar callus strongly thickened, expanded, partially or fully covering the umbilicus.

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.