Cirsotrema, Morch, 1852

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 : 48-49

“ Cirsotrema ” strebeli Zelaya & Güller, 2017

Fig. 2J

“ Cirsotrema ” strebeli Zelaya & Güller, 2017: 63 , figs. 13, 14 (synonymy, protoconch and radula)

Examined material. 25 sh. (MACN-In 40673); holotype (MACN-In 40393) and 10 paratypes (MACN-In 40394).

Description. Shell height to 9 mm (up to 13.2 mm according to Zelaya & Güller 2017); turritelliform, solid. Protoconch smooth, of 1.75 markedly angulated whorls. Teleoconch of up to 5.75 whorls, markedly convex in outline; last whorl comprising about 45% of total shell height. Suture deep, markedly channeled. Surface white; sculptured at each whorl with 15 to 16 strong axial ribs and 6 low but wide spiral cords at interspaces. In addition,

the last whorl has a strong cord at periphery of base. Aperture rounded, thick, interior white; columellar callus thick, slightly expanded anteriorly.

Figures

FIGURE 2. A. Parmaphorella melvilli (Thiele, 1912), MACN-In 40660, scale bar = 4 mm. B. Puncturella conica (d´Orbigny, 1841), MACN-In 40661, scale bar = 2 mm. C. Anatoma conica (d´Orbigny, 1841), MACN-In 40662, scale bar = 1 mm. D. Scissurella clathrata Strebel, 1908, MACN-In 40663, scale bar = 0.5 mm. E. Calliostoma cf. moebiusi Strebel, 1905, MACN- In 40665, scale bar = 4 mm. F. Margarella expansa (Sowerby, 1838), MACN-In 40666, scale bar = 2 mm. G. Ganesa sp., MACN-In 40667, scale bar = 1 mm. H. Liotella crassicostata (Strebel, 1908), MACN-In 40664, scale bar = 0.25 mm. I. Colpospirella algida (Melvill & Standen, 1912), MACN-In 40668, scale bar = 2 mm. J. “Cirsotrema” strebeli Zelaya & Güller, 2017, MACN-In 40673, scale bar = 2 mm. K. Cerithiopsis (?) caelatum (Gould, 1849), MACN-In 40677, scale bar = 2 mm. L. Cerithiopsilla burdwoodiana (Melvill & Standen, 1912), MACN-In 40674, scale bar = 1 mm. M. Cerithiopsilla sp., MACN-In 40675, scale bar = 1 mm. N. Eumetula michaelseni (Strebel, 1905), MACN-In 40676, scale bar = 1 mm.