Lindholmiola regisborisi (A. J. WAGNER, 1927 )

Subai, Peter & Neubert, Eike, 2014, Revision of the genus Lindholmiola HESSE, 1931 (Gastropoda: Pulmonata: Helicodontidae), Contributions to Natural History 23, pp. 1-94 : 72-76

Lindholmiola regisborisi (A. J. WAGNER, 1927)

Figs 40–42 , 43 , 46

1927 Caracollina regis-borisi A. J. WAGNER , Annales zoologici Musei Polonici Historiae Naturalis, 6 (4): 364, Taf., 19 Fig. 166–168.

1957 ( Lindholmiola?) regisborisi , – Jaeckel, Klemm & Meise, Abhandlungen und Berichte aus dem Staatlichen Museum für Tierkunde in Dresden, 23 (2): 165.

1988 Lindholmiola regisborisi , – Reischütz, Annalen des Naturhistorischen Museums in Wien, 90 (B): 347.

1990 Lindholmiola regisborisi , – Fechter & Falkner, Steinbachs Naturführer: 222.

Diagnosis: shell planispiral, strongly haired, umbilicus dish-like, perspective, long bursa copulatrix.

Description of shell: shell almost planispiral, basic colour light brown to yellowish-brown; initial half of the protoconch whorl smooth, then with a very fine and dense radial sculpture; teleoconch surface with strong radial riblets of different size producing an undulating sculptural pattern (magnification required), whole shell with a dense granulation, ventral side of the shell with fine radial riblets and granulation; shells strongly haired, with a hair-free subsutural zone followed by a zone of permanent hairs around the blunt periphery of the shell (hairs in this area 0.8–2.3 mm long), ventral side of the shell usually without hairs, the umbilicus with very short bristles; shell with 5¾–7 regularly increasing and well rounded whorls, with a blunt shoulder; suture very deep; umbilicus dish-like, perspective, diameter 2.4–4.2 mm; aperture very oblique, slightly curved in lateral view; in frontal view subquadrate to obliquely oval, strongly cut out on the left side, peristomial insertions with a gap of 2.6–4.1 mm; parietal callus very thin, undulating; peristome sharp, strongly broadened apically and laterally, slightly reflected basally; oblique columellar reflection, but only covering ca 1/10 of its diameter.

Measurements: H: 5–6.25; D: 12.5–16.5; aH: 4.85–6.4 (2–3.1); aW: 5.9–8.

Details of body (according to 8 animals from 400 m S of Kehrókambos): body dark brown to blackish-greyish, head and eye-stalks grey with a darkbrown tip; tale grey; sole cream with greyish lateral rims; mantle along the lung vein with two stripes of dark-brown pigmentation of rounded spots; secondary ureter opens 0.5 –1.5 mm from the pneumostome, where it splits into two canals.

Morphology of the genital organs ( Fig. 46 ): penis relatively short, slightly thickened, penial glandular tissue covers ca 1/3–1/2 of the total penis length, penial lumen with two equally sized, serrated pilasters, starting at the distal penial wall and stretching to the penial pore, sometimes with short perpendicular folds between the pilasters; vagina very short, somewhat broadened; glandula narrow with a short stalk and a long and scarcely folded part; bursa copulatrix reaching twice the length of the glandula with a pedunculus occupying half of the total length, vesicle strongly inflated; atrial lumen with a large, broad and flat, serrated pilaster, connecting to the vaginal lumen and reaching the proximal end of the vagina; opposite side of the atrial lumen with a semi-circular, keeled fold.

Differential diagnosis: Due to the large planispiral shell with the shouldered whorls, the long hairs and the large dish-like umbilicus, this species cannot be confused with any other species of Lindholmiola . Other differentiating features are the unusually long bursa copulatrix with its clearly separated vesicle, and the specific formation of penial and atrial pilasters.

Type specimens: Greece, Thráki , Xánthi, UTM LF 25, 41.14°N 24.89°E, syntypes: NMNH 3167/4 .

Additional specimens examined:

Greece, Makedonía, limestone mountain approx. 2.5 km NNE of Zarkadía (along the road), 450 m alt., UTM LF 04 , 41 .0288°N 24.6417°E, leg. Fauer, 18.08.1979, S 12475 /2 ; leg. Kiss & Pintér 7.7.1986, HNHM 29888 /6 + 4 (juv.) ; leg. Fauer & Subai 22.09.1989, S 13977 /58 ; leg. Subai 7.5.1995, S 14082 /16 ; mountain E of Makrihóri , beside a marble quarry, 650 m alt., UTM LF 04 , 41 .0692°N 24.6298°E, leg. Subai 07.05.1995, S 14083 /4 ; stone hedge in valley of two mountains 1 km from Ágios Kosmás direction Makrihóri , 380 m alt., UTM LF 04 , 41 .0783°N 24.6536°E, leg. Subai 26.05.1997, S 15472 /17 ; valley 2.5 km E of Makrihóri (= direction Kehrókambos ), beside village ruins, on limestone rocks, 180 m alt., UTM LF 04 , 41 .0466°N 24.6462°E, leg. Subai 26.05.1997, S 15473 /16 ; small river gorge 4.1 km from Kehrókambos direction Makrihóri , stone hedge, under stones, 485 m alt., UTM LF 05 , 41 .1292°N 24.6448°E, leg. Subai 26.05.1997, S 15474 /1 ; 7.2 km from Kehrókambos direction Makrihóri, at crossing to Skopós , under stones, 550 m alt., UTM LF 05 , 41 .1043°N 24.6392°E, leg. Subai 26.05.1997, S 15475 /3 ; 400 m S of Kehrókambos , under (lime) stones, 390 m alt., UTM LF 05 , 41 .1514°N 24.6454°E, leg. Subai 07.05.1995, S 14086 /13 + 14 (alk.) ; 4 km from Kehrókambos direction Stavroúpoli , on low limestone rocks, approx., 180 m alt., UTM LF 06 , 41 .1806°N 24.6687°E, leg. Subai 07.05.1995, S 14085 /1 ; limestone mountain W of Stavroúpoli (= at the opposite bank of Néstos river ), in forest, on limestone rocks, 120 m alt., UTM LF 06 , 41 .2031°N 24.7057°E, leg. Subai 27.07.1990, Maa /3, S 14059 /35 ; leg. Subai 24.05.1997, S 15471 /25 + 5 (juv.) ; Parádissos Village , UTM LF 15 , 41 .08°N 24.76°E, leg. Kiss & Pintér 7.7.1986, HNHM 29889 /12 + 2 (juv.) ; leg. Maassen 7.1980, Maa /11 + 9 (juv) ; NE border of Parádissos, on limestone rocks, 60 m alt., UTM LF 15 , 41 .0843°N 24.7612°E, leg. Subai 25.05.1997, S 15476 /11 + 1 (juv.). — Thráki, 2 km E of Stavroúpoli , UTM LF 06 , 41 .21°N 24.73°E, leg. Kiss & Pintér 5.7.1986, HNHM 29887 /1 + 4 (juv.) ; gorge near Xánthi , UTM LF 25 , 41 .14°N 24.88°E, leg. Schütt 2.5.1962, HNHM 39235 /3, SMF 279328 /4 ; leg. Maassen 7.1980, Maa /18 + 8 (juv.) ; 2 km N of Xánthi (= direction to Stavroúpoli ), on limestone rocksW of the highway, 140 m alt., UTM LF 25 , 41 .1591°N 24.8806°E, leg. Subai 27.07.1990, S 14058 /43.

Turkey, Marmara , Marmara Adasi, 40.59°N 27.56°E, 04.07.1976, leg. Oberling & Gerber, NMBE 515643 /2 ; ditto, 08.08.1977, leg. Oberling & Gerber, NMBE 515642 /1, NMBE 515633 /8 ; Kaleh , Marmara Adasi, 40.62°N 27.62°E, 08.08.1977, leg. Oberling & Gerber, NMBE 515630 /20.

Remarks: The shells of L. regisborisi are not variable, there are no local forms of this species known so far.

Distribution ( Fig. 43 ): This species is known to live in a small area in the Lekánis Mountains in Greece, west of the Néstos River, in the lower Néstos valley between Stavroúpoli and Parádissos and east of the Néstos River to Xánthi in Thráki. The record from Marmara Adasi is isolated from the Greek distribution area, and is probably the result of an introduction due to anthropogenic activities. This is the first record of this species for Turkey.

Figures

Figs 40–42. Lindholmiola regisborisi. Fig. 40: syntype Caracollina regis-borisi, NMNH (Sofia) 3167/4, Greece, Thrakia, Xanthi, D = 17.4 mm; Fig. 41: NMBE 515619, Greece, Makedonía, 400 m S of Kehrókambos, D = 15.01 mm; Fig. 42: NMBE 515630, Turkey, Marmara Adasi, Kaleh, D = 14.78 mm. — All photos Neubert/Bochud, × 3.

Fig. 43. Distribution of Lindholmiola regisborisi.

Figs 44–46. Genital organs of Lindholmiola species. Fig. 44: Lindholmiola gyria, a: situs, b: lumina of genital organs, Turkey, Vilayet Antalya, Phaselis; Fig. 45: Lindholmiola barbata, a: situs, b: lumina of genital organs, Greece, Island Kríti, Nomos Haniá, Soúda Bay; Fig. 46: Lindholmiola regisborisi, a: situs, b: lumina of genital organs, Greece, Makedonía, 400 m S of Kehrókambos.