Alvania (Alvania) productilis Boettger, 1906

TĂMAȘ A., TĂMAȘ D. M. & POPA M. V., 2013, Badenian Small Gastropods From Lăpugiu De Sus (Făget Basin, Romania). Rissoidae Family, Acta Palaeontologica Romaniae 9 (1), pp. 57-66 : 60

Alvania (Alvania) productilis Boettger, 1906

Fig. 2e

1906 Alvania (Alvania) productilis n. sp. - Boettger, p. 156, nr. 539

1934 Alvania (Alvania) productilis Boettger - Zilch, p. 212, pl. 5, fig. 83

1975 Alvania (Alvania) productilis Boettger - Bałuk, p. 81, pl. 9, fig. 6

1981 Alvania (Alvania) productilis (Boettger) - Švagrovskỳ, p.117, pl. 36, fig. 6, 7

Material: two specimens from L5 (one specimen PMBBU 23854 )

Description: Conical shell consisting of five whorls, up to 2.10 mm in height and 1.25 mm in width.

Protoconch consists of two convex whorls ornamented with spiral threads; the transition to the teleoconch is not well noticeable. Teleoconch with convex whorls and a well-defined suture. On the first whorl there are 20 axial ribs intersected by four spiral threads. The last whorl represents about 70% of the total shell height; it is ornamented with 20 axial ribs intersected by spiral threads. The base is ornamented with four spiral threads. The aperture is drop-like. The inner lip covers the umbilicus, while the external none is thickened due to a varix; it presents inner denticles.

Distribution: identified in Poland ( Bałuk, 1975), Slovacia (Švagrovskỳ, 1981), Romania (Boettger, 1906; Zilch, 1934)

Figures

Fig. 2 - a Rissoa acuticosta (Sacco, 1895). b Rissoa clotho Hörnes, 1856. c Rissoa costeiensis Kowalke & Harzhauser, 2004. d Alvania (Alvania) oceani (d'Orbigny, 1852). e Alvania (Alvania) productilis Boettger, 1906. f Alvania (Alvania) perregularis (Sacco, 1895). g Alvania (Alvania) ampulla (Eichwald, 1853). h Alvania (Alvania) helenae Boettger, 1901. i Alvania (Alvania) transiens (Sacco, 1895).