Microdeuthria michaelseni (Strebel, 1905)

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 : 55

Microdeuthria michaelseni (Strebel, 1905)

Fig. 3J

Euthria (Pareuthria) michaelseni Strebel, 1905b: 621 , pl. 21, figs. 6, 6a–b

Microdeuthria michaelseni — Pastorino, 2016: 337 , figs. 27A–O, 28A–G (syntypes, synonymy, protoconch and radula)

Examined material. 7 sh. (MACN-In 40684).

Description. Shell height to 6.8 mm (up to 11 mm according to Pastorino 2016); elongate-fusiform, moderately solid. Protoconch large, of 2.25 slightly convex whorls, the first slightly keeled. Teleoconch of up to 2.75 whorls, almost straight in outline; last whorl comprising about 70% of total shell height. Suture impressed. Surface brownish, with a paler band at the middle of the last whorl and at the suture of the spire whorls; sculptured with 7 to 10 fine spiral grooves on the spire whorls and about 40 on the last whorl. Aperture ovate; columellar callus narrow; siphonal canal short, 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.