Alvania (Alvania) perregularis (Sacco, 1895)

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) perregularis (Sacco, 1895)

Fig. 2f

1895 Acinus Mariae ? var. perregularis Sacc. – Sacco, 18, p. 25

1954 Alvania perregularis Sacco - Friedberg, p. 377, pl. 22, fig 14, 15

1960 Alvania (Alvania) perregularis (Sacco) - Kojumdgieva and Strachimirov, p. 100, pl. 30, fig. 16 a, b 1966 Rissoa (Alvania) perregularis Sacco - Strausz, p. 73, pl. 46, fig. 12, 13

1973 Alvania perregularis Sacco – Bohn-Havas, p. 1037, pl. 3, fig. 1,2

partim 1975 Alvania (Turbona) perregularis (Sacco) – Bałuk, p. 85, pl. 9, fig. 14,15

1981 Alvania (Turbona) perregularis (Sacco) - Švagrovskỳ, p. 118, pl. 36, fig. 4

partim 1981 Alvania perregularis Sacco - Krach, p. 51, pl. 15, fig. 6

1993 Alvania perregularis Sacco - Șuraru and Papp, pl. V, fig 18

2000 Alvania (Turbona) perregularis (Sacco) - Popa and Ianoliu, p. 84, pl. 2, fig. 6

2004 Alvania (Alvania) perregularis (Sacco) – Kowalke and Harzhauser, p. 120, fig. 7B

Material: eight specimens, one from L5, one from L2, one from Lp4, and five from Lp10 (one specimen PMBBU 23855 )

Description: Conical shell consisting of six whorls; up to 2.63 mm in height and 1.55 mm in width. Protoconch is consisting of about 2.75 convex whorls ornamented with finely grained spiral threads. The transition to the teleoconch is well-defined. The teleoconch shows flat whorls with canaliculate suture. Ornamentation represented by up to 37 axial ribs intersected by up to 14 spiral threads resulting in reticulated pattern with fine knots at the junctions. The last whorl represents about 70% of the total shell height. Drop-like aperture with inner lip partly covering the umbilicus. External lip with inner denticles. The shell shows varices both on the aperture area, and on other locations on the whorls.

Distribution: identified in Czech Republic ( Kowalke and Harzhauser, 2004), Poland ( Friedberg, 1954; Bałuk, 1975; Krach, 1981), Slovacia (Švagrovskỳ, 1981), Hungary ( Strausz, 1966; Bohn – Havas, 1973), Bulgaria ( Kojumdgieva and Strachimirov, 1960), Romania ( Șuraru and Papp, 1993; Popa and Ianoliu, 2000).

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).