Two new species of the genusBythinella Moquin-Tandon, 1856 (Mollusca: Gastropoda: Hydrobiidae) from the Western Balkan Peninsula)
Author
Glöer, Peter
Biodiversity Research Laboratory, Schulstr. 3, D- 25491 Hetlingen, Germany. E-mail: gloeer @ malaco. de.
Author
Pešić, Vladimir
text
Ecologica Montenegrina
2014
2014-12-20
1
4
249
255
journal article
2336-9744
urn:lsid:zoobank.org:pub:724A7D13-BF8C-4643-91BD-44B9BB2ADE45
Bythinella istoka
n. sp.
(
Figs. 11 13
)
Type series
.
Holotype
(
ZMH 79886
): Shell height
2.8 mm
, shell width
1.6 mm
;
Kosovo
,
Istok
town, spring Vrelo, leg.
Berlajolli.
Paratypes
(
ZMH 79887
)
:
10 ex.
;
17 ex.
coll. Glöer,
same data and locality as
holotype
.
Locus typicus
.
Kosovo
,
Istok
town, spring
Vrelo
,
42°46'29.6"N
,
20°23'58.1"E
.
Etymology
. Named after the town (
Istok
) where the species was found.
Description
Shell
: Shell whitish, cylindrical, its 4.5 whorls slightly convex, with a deep suture. The first two whorls small in height, the other whorls are fast growing. Surface silky and finely striated. Apex obtuse, umbilicus closed. Aperture oval, its top angled, periostome thickened at the columella. Shell height
2.7 2.8 mm
, width
1.5–1.6 mm
, height aperture/shell ratio 0.46.
Figures 11 13
.
Bythinella istoka
n. sp.
:
11
shell (holotype),
12
penis in situ,
13
penis and flagellum.
Soft body.
The mantle is black, the head is greyish with a dark stripe from eye to eye. Penis shorter than penial appendix. The flagellum is long, attenuated proximally.
Differentiating features
.
Bythinella istoka
n. sp.
can be distinguished from the other species of this genus from the Western Balkan by the first two whorls, which are small in height. The similar shape of the first two whorls is found in
B. taraensis
, but the shell of the latter species is broader (
1.8 1.9 mm
vs
.
1.5 1.6 mm
in
Bythinella istoka
n. sp.
) by nearly the same shell’s height. In addition
B. taraensis
differs by the flagellum which is longer, and thin along the entire length.
Distribution
.
Kosovo
; known only from the
type
locality (
Fig. 15
).