Two new Bythinella species from Romania ( Gastropoda : Amnicolidae )

Recently collected samples of freshwater molluscs from springs in NW and SW Romania revealed two new Bythinella spp. which are here described as new for science. The holotypes and paratypes are depicted as well as the penis morphology. Of one species only empty shells could be found.

This paper is intended to describe the new Bythinella muranyii n. sp. and B. gregoi n. sp.

Material and Methods
The snails were collected recently in Romania (fig. 1) by the junior author by sieving and by hand and fixation in 75% ethanol.The dissections and measurements of the genital organs and the shells were carried out using a stereo microscope (ZEISS); the photographs were made by a digital camera system (Leica R8).
The following abbreviation is used: HNHM (Hungarian National History Museum, Budapest).

Description:
The yellowish-brown shell has 4.5 whorls which are slightly convex with a deep suture.The shell is elongated cylindric-ovate.The aperture is ovate and lightly angled at the top.The peristome is sharp and not thickened at the columella.The umbilicus is closed.Aperture height to shell height: 0.4, height of body whorl to height of spire 1.5-1.7,shell height 2.3-2.9 mm, width 1.3-1.6 mm.Animal: The mantle is black with a white boarder, eye spots are visible.

Male copulatory organ:
The penial appendix is as long as the penis.The tubular gland is long, thin at the proximal end and thick at the distal end.

Differentiating features:
The new species differs from B. dacica by the much more slender penis depicted by Falniowski et al. (2009: p. 25) and the shell height to shell width ratio which is in B. dacica 1.6-1.7 while it is in B. muranyii n. sp.1.8.In B. gregoi n. sp. the shell is larger and the tubular gland is shorter and thick at the proximal end, while it is in B. muranyii thin at the proximal end.From B. reginae n. sp. it differs in size.

Ecology:
The specimens were collected from stones in the spring outlet.The spring has rather cold water, shaded by some close conifers.There are water pipes for water collection but the outlet brook is open; the spring has permanent free outflow (Fig. 14).
Distribution: Only known from type locality.

Etymology:
The species is dedicated to the junior author's friend and colleague Jozef Grego, Malacologist of Horná Mičiná, Slovakia in honor to his engagement in Hydrobiidae studies.

Description:
The horn-colored shell has 4.5 whorls which are slightly convex with a deep suture.The shell is elongated cylindrical-ovate.The aperture is ovate and slightly angled at the top.The peristome is sharp.
The umbilicus is slit-like to closed.Aperture height to shell height: 0.4, shell height to shell width 1.6-1.9,height of body whorl to height of spire 1.9-2.1,shell height 2.2-2.6 mm, width 1.3-1.4mm.

Differentiating features:
The shells are smaller than the other species of this region.In addition the shells differ in the ratio of height of body whorl to spire.

Ecology:
The spring has cold water, shaded by some close conifers.There are water pipes for water collection but the outlet brook is open.