Islamia burduricus, Yildirim & Kaya & Gürlek & Koca, 2017

Yildirim, Mehmet Zeki, Kaya, Duygu Ceren Çağlan, Gürlek, Mustafa Emre & Koca, Seval Bahadir, 2017, A new species of Islamia (Caenogastropoda: Hydrobiidae) from Lakes region of Turkey, Ecologica Montenegrina 11, pp. 9-13 : 11-12

Islamia burduricus n. sp.

Islamia falknowskii, Bahadır Koca, S., 2007 [nomen nudum]

Holotype: SH 1.30 mm, SW 0.90 mm, AH 0.71 mm AW 0.63 mm, from type locality in HUZOM-M1101 .

Paratype: 1 specimens from type locality in HUZOM-M1102 .

Additional material examined: 12 ex. from Type locality, 1 specimen in coll. Gürlek ( Mehmet Akif Ersoy University , Turkey) .

Type Locality: Çibiş pınarı, Can Alabalık Tesisleri (trout farm), Aziziye, Burdur, Turkey.

Etymology: Named after Burdur province.

Description: Shell trochiform, translucent, with 3-3.5 convex whorls and blunt apex. Last whorl nearly twice broader than the penultimate whorl. Sutures deep. Aperture roundish oval, umbilicus slit shaped, columellar margin thickened tough not covering umbilicus. Operculum rounded. Head not pigmented except the eye region. Penis proximally thick, gradually tapering towards the tip; forked with two unequal lobes, smaller of which being proximal. Ovary canal thick and unpigmented, with a distinct seminal receptacle ( Figure 3 , 4 ).

Measurements (n=20): SH: 1.24 mm (min 1.07/max 1.39), SW: 1.04 mm (min 0.93/max 1.15), SH/SW: 1.19 ah/SH: 0.49

Habitat: The specimens were collected from the outflow of a spring with gravel bottom and aquatic vegetation ( Juncus sp. , Veronica anagallis-aquatica and Nasturtium officinale ). Small sized pebbles were covered by periphyton. Specimens were collected on stones and aquatic plants.

Discussion: The shell of Islamia burduricus n. sp. relatively delicate and thinner. Shell dimensions closer to that of I. bunarbasa (SH: 1.32-1.65, SW: 1.1-1.16, SH/SW: 1.31, n=10, according to Radoman, 1983), differing form it by a lower SH/SW ratio (1.19). Umbilicus narrower than other species described from Turkey. Columellar thickening is also typical for the new species. The penial lobes are equal or subequal in the previously described species, while the proximal lobe is distinctly smaller in the new species. Islamia burduricus n. sp. similar to Islamia valvataeformis (Möllendorf, 1873) described from Balkans by the penis morphology but I. valvataeformis has no pigmentation on the penis and separate from each other by the shell morphology.

Islamia lives in non-polluted springs rich with aquatic vegetation. Many of them have narrow distribution and are only known from their type localities ( Beran et al., 2016). The new species I. burduricus n. sp. also seems to be locally endemic. The locality is close to the trout farm but it is not affected by farm. It is upper side of the farm. This genus is widespread on the lakes region so there may be new species in the region.

Figures

Figure 3. Islamia burduricus n. sp. A: shell of holotype, B: penis in situ C: Penis with two lobes (L1: Distal lobe of the penis, L2: Proximal lobe of the penis). Abbreviations: p = penis, s = snout, t= tentacle.

Figure 4. Anatomical drawings of Islamia burduricus n. sp. a. female genital tract b. central tooth of radula c. operculum (scale: 1mm).