Pseudorientalia kanari D.A. Odabaşı, 2024

Odabaşi, Deniz Anil, Mercan, Deniz, Odabaşi, Serpil & Arslan, Naime, 2024, A new species of Pseudorientalia (Gastropoda: Hydrobiidae) from midwestern Türkiye with notes on Pseudorientalia natolica (Küster, 1853), Zootaxa 5415 (4), pp. 585-592 : 587-590

Pseudorientalia kanari D.A. Odabaşı sp. n.

Holotype: Alcohol-fixed specimen from Göksu Spring, 39°09’01.5”N 31°36’49.2”E, 839 m. alt., Göktepe village , Sivrihisar district , southeast of Eskişehir province, Türkiye ( Fig. 1 : 1, Fig. 4 ) leg. Naime Arslan and Deniz Mercan on 9 th of May 2023, deposited at the Limnology Museum of Çanakkale Onsekiz Mart University ( COMULM) under the voucher code of COMULM-G 298 . Shell Height = 2.4 mm, SW = 1.42 mm, AH = 1.06 mm, AW = 0.86 mm, ( Fig. 3A ).

Paratypes: Twenty fully grown, alcohol-fixed specimens leg. Naime Arslan and Deniz Mercan from type locality on 9 th of May 2023, were measured. Five of which were dissected and deposited in COMULM and Eskişehir Osmangazi University, Museum of Hydrobiology Department, ( ESOGU), Ţrkiye under the codes of COMULM-G 299 (15 specimens including soft parts) and ESOGU Gastropoda (C) No 2 (5 specimens) ( Fig. 3. B–I ) .

Additional Materials: Four specimens were measured, two of which were dissected from the 2 nd station ( Fig. 1 : 2); Karkolu Spring 39°09’10.6”N 31°37’00.4”E, 806 m. alt., leg. Deniz Mercan and Naime Arslan, 9 th of May 2023. Deposited in COMULM-G 300.

Etymology. The species is named after Mehmet Sait Kanar, head of the Eskişehir Nature Conservation and National Parks Department.

Description: Shell conical, semi-transparent with glossy or rough surface up to 4½ slightly convex and regularly growing whorls. Sutures shallow, umbilicus open, continuous aperture ovoid and angled at top, operculum concentric and yellowish in color. Mantle dark black. Face with black patches, tentacles white with black stripe around eyes. Penis simple, elongated, awl-like, black pigmented from its middle to the tip, vas deferens invisible. Female reproductive organs unpigmented, with two seminal receptacles (rs), rs-1 very fine, rs-2 thick thread-shaped. Renal oviduct looped. Medium-sized bursa copulatrix circular shaped and depressed at both sides of the center ( Fig. 3. A–I ).

Habitat: The type locality is a spring with several outflows in the area. The fast-flowing water is crystalline and the bottom covered with cobble – pebble substrate with patches of filamentous algae ( Fig. 4 ). The only species found with Pseudorientalia kanari sp. n. is Theodoxus sp.

Differential diagnosis: Pseudorientalia kanari sp. n. is clearly distinct from P. natolica by its shell and anatomical features: P. kanari sp. n. has up to 4½ slightly convex whorls with open sutures, high spire and open umbilicus, whereas P. natolica has 3½–4 tumid whorls with well-developed last whorl. Pseudorientalia natolica has lower spire and deeper sutures than those of P. kanari n. sp. and has a slit-like umbilicus, unlike P. natolica . The biometry of the shell characters differed significantly from each other according to Student-t test. In this context, all of the measured shell parameters with normal distribution were significant at the p<0.001 except BWH. In the penis and female genital comparisons, we found minor differences between penes of P. kanari sp. n. and P. natolica : The penis is simple and elongated with black pigmentation from the middle to the tip in P. kanari sp. n., whereas in P. natolica the penis is awl-like with a broader base and pigmented in the middle. There are, however, clear differences in the genital chambers of the females of these two species: The bursa copulatrix (bc) is quite large and rs-2 short but stubby in P. natolica , whereas P. kanari sp. n. has a medium sized bc that is depressed on both sides and rs-2 like a thickened thread. Facial pigmentation is characteristic of both species, e.g. the head and tentacles of P. natolica are dark black, whereas the black face with black stripes is visible around the eyes of the tentacles of P. kanari sp. n.

Also found in Ţrkiye is Pseudorientalia ceriti from south-eastern Anatolia; quite far from the type locality of Pseudorientalia kanari sp. n. Although the number of whorls in both species above are up to 4½, P. ceriti has smaller shell dimensions than those of P. kanari sp. n. The maximum values of SH, SW, AH and AW of P. ceriti were 1.83, 1.2, 0.96 and 0.78 mm respectively, smaller than P. kanari sp. n. ( Table 1 ). Furthermore, P. ceriti has a darker snout and lighter tentacles than P. kanari sp. n. ( Fig. 3 : D-E; Gürlek 2017: 995). The unnamed populations of the genus Pseudorientalia in the Aegean Islands differed from each other based on morphological and genetic data ( Szarowska et al. 2014a; b). They are also separated by their morphological structures from the Turkish conspecific taxa, as well as P. kanari described here.

Figures

FIGURE 1. The sampling sites. Yellow rectangle: The geographical position of the study area, Yellow Star: Type locality of Pseudorientalia natolica, Blue Star: Type locality of Pseudorientalia ceriti, Red dots: Sampling sites, 1: Type locality of the new species, 2: Spring from which additional material was obtained. (Map scale, Türkiye; 1:7.300.000, the study area; 1:55.900, EsriSat).

FIGURE 3. Pseudorientalia kanari sp. n. A. shell of the holotype, B–I. paratypes: (B-C) shells from station 2; (D) penis in situ (sta-2); (E) penis in situ (type loc.); (F) operculum from type loc.; (G) penis close-up (sta-2); (H) penis close-up (type loc.); (I) female genitalia (type loc.). Scale bars: A–C = 1 mm, D–I= 0.5 mm. bc: Bursa copulatrix, e: Eye Spot, f: Foot, p: Penis, ro: Renal oviduct, rs: Seminal receptacle, s: Snout, t: Tentacle.

FIGURE 4. The type locality of Pseudorientalia kanari sp. n. Göksu Spring, Göktepe village, Sivrihisar district, southeast of Eskişehir province, Türkiye.