Revealing the stygobiotic and crenobiotic molluscan biodiversity hotspot in Caucasus: Part I. The phylogeny of stygobiotic Sadlerianinae Szarowska, 2006 (Mollusca, Gastropoda, Hydrobiidae) from Georgia with descriptions of five new genera and twenty-one new species Author Grego, Jozef Horna Micina 219, 97401, Banska Bystrica, Slovakia Author Mumladze, Levan Institute of Zoology, Ilia State University, Kakutsa Cholokashvili Ave 3 / 5, Tbilisi 0162, Georgia https://orcid.org/0000-0002-2172-6973 Author Falniowski, Andrzej Department of Malacology, Institute of Zoology and Biomedical Research, Jagiellonian University, ul. Gronostajowa 9, 30 - 387, Krakow, Poland Author Osikowski, Artur Department of Animal Reproduction, Anatomy and Genomics, University of Agriculture in Krakow, al. Mickiewicza 24 / 28, 30 - 059, Krakow, Poland https://orcid.org/0000-0001-6646-2687 a.osikowski@urk.edu.pl Author Rysiewska, Aleksandra Department of Malacology, Institute of Zoology and Biomedical Research, Jagiellonian University, ul. Gronostajowa 9, 30 - 387, Krakow, Poland Author Palatov, Dimitry M. Department of Hydrobiology, Biological Faculty, Moscow State University, 1 - 12 Leninskie Gory, 119991, Moscow, Russian Federation Author Hofman, Sebastian Department of Comparative Anatomy, Institute of Zoology and Biomedical Research, Jagiellonian University, ul. Gronostajowa 9, 30 - 387, Krakow, Poland text ZooKeys 2020 955 1 77 http://dx.doi.org/10.3897/zookeys.955.51983 journal article http://dx.doi.org/10.3897/zookeys.955.51983 1313-2970-955-1 C8EF4A4B6F054621B9B5AE47FEE7C217 F7018CF19C6158309D57C83A2F5E9478 Imeretiopsis iazoni Grego & Mumladze sp. nov. Plate 8 (5-6) Type locality. Georgia • Imereti, Kuatisi, Iazoni (Tskhal-Tsiteli) Cave Spring (იაზონის იგივე წყალ-წითელას მღვიმე ), right bank of Tskalsitela River Canyon; 42°16'18"N , 42°44'02"E ; 145 m a.s.l.; sandy sediment inside the cave. Material. Holotype : Georgia • 1 adult, dry; type locality; J. Grego, L. Mumladze and G. Bananashvili leg.; ISU FM-T014-H. Paratypes : same as for holotype, ISU FM-T014-P1/1 dry, coll. JG F1409/1dry. Diagnosis. The species differs from the most closely related Imeretiopsis gorgoleti sp. nov. by its much smaller, less inflated shells with proportionally smaller and less expanded aperture and by the smaller umbilicus. From the other stygobiotic gastropods of the region with similar shell shape it differs by its smaller shell with the sinuated lateral labral profile. From the sympatric I. cameroni sp. nov. it differs by the much smaller shell, more inflated whorls, flatter apex and more open umbilicus. Measurement comparison Imeretiopsis species is given in Table 5 . Table 5. Measurement comparison of species from genus Imeretiopsis gen. nov.
Genus species H W BH BW AH AW CA H/W AH / AW W / BW H/BH H/AH W / AW H/(W- BW)
mm mm mm mm mm mm deg.
Imeretiopsis gorgoleti sp. nov. Holotype LT 2.18 1.44 1.35 1.15 0.9 4 0.82 38 1.51 1.15 1.25 1.61 2.32 1.76 7.52
Imeretiopsis gorgoleti sp. nov. Paratype LT 1.64 1.03 1.09 0.85 0.71 0.62 35 1.59 1.15 1.21 1.50 2.31 1.66 9.11
1.85 1.02 1.18 0.94 0.76 0.62 30 1.82 1.23 1.08 1.57 2.43 1.64 23.72
Imeretiopsis iazoni sp. nov. Holotype LT 1.47 0.74 0.85 0.68 0.50 0.47 35 1.99 1.06 1.09 1.73 2.94 1.57 24.50
Imeretiopsis iazoni sp. nov. Paratype LT 1.35 0.88 0.82 0.68 0.50 0.41 32 1.53 1.22 1.29 1.65 2.70 2.15 6.75
Imeretiopsis cameroni sp. nov. Paratype LT 2.29 0.94 1.15 0.79 0.71 0.53 34 2.44 1.34 1.19 1.99 3.23 1.77 15.27
2.12 0.85 1.06 0.71 0.62 0.50 32 2.49 1.24 1.20 2.00 3.42 1.70 15.14
Imeretiopsis cameroni sp. nov. Holotype LT 2.00 0.81 0.96 0.72 0.62 0.49 35 2.47 1.26 1.12 2.09 3.24 1.65 23.50
Imeretiopsis prometheus sp. nov. Holotype LT 1.66 0.53 0.87 0.72 0.60 0.47 33 3.12 1.27 0.74 1.90 2.79 1.14 -8.67
Imeretiopsis prometheus sp. nov. Topotype LT 1.63 0.85 0.88 0.75 0.55 0.48 32 1.91 1.16 1.13 1.86 2.95 1.79 16.25
1.55 1.63 0.90 0.70 0.53 0.45 31 0.95 1.17 2.32 1.72 2.95 3.61 1.68
1.43 0.75 0.75 0.63 0.48 0.38 32 1.90 1.27 1.20 1.90 3.00 2.00 11.40
1.48 0.88 0.85 0.70 0.58 0.45 30 1.69 1.28 1.25 1.74 2.57 1.94 8.43
1.70 0.88 0.88 0.73 0.53 0.46 34 1.94 1.14 1.21 1.94 3.24 1.89 11.33
Imeretiopsis nakeralaensis sp. nov. Holotype LT 2.00 1.09 1.02 0.85 0.64 0.53 29 1.84 1.20 1.28 1.96 3.13 2.04 8.55
Description. Shell : rather small, 1.38-1.47 mm high, elongate-conical with four whorls, blunt and flat apex, inflated whorls and deep suture. Umbilicus narrow, almost closed. Shell surface glossy, milky white with irregular growth lines, randomly forming faint, rib-like structures. Aperture irregularly oval, slightly depressed from columellar side and slightly expanded. Lateral labral profile very weakly sinuated, columellar profile rather straight. Operculum : not known. Animal body : not known. Holotype measurements : H-1.47 mm; W-0.74 mm; BH-0.85 mm; BW-0.68 mm; AH-0.50 mm; AW-0.47 mm; CA: 35°. Anatomy : not known. Etymology. Named after the type locality, Iazoni Cave (იაზონის მღვიმე ) (= Tskal-Tsiteli = Rioni Cave (= წყალწითელას = რიონის მღვიმე )) in Kutaisi. Habitat. Stygobiotic species. See habitat of Imeretiopsis cameroni sp. nov. Distribution. Only known from the type locality. Conservation status. The number of known locations (1) is no more than 5 and EOO is smaller than 20 km2. There is no reason to suppose that AOO, EOO, number of locations, number of subpopulations or the number or mature individuals are declining however due to its extremely small EOO we assessed as Vulnerable (VU) D2. Remarks. The assignment to the genus Imeretiopsis gen. nov. is only provisional due to sinuated aperture margins and resemblance to I. gorgoleti . sp. nov.; molecular data will be needed to determine its true taxonomic status. The type locality has indications of occasional pollution, and most of the stygobiotic Mollusca endemic to the cave ( M. borutzkii (Shadin, 1932), Euglesa subterranea (Shadin, 1932) and Imeretiopsis cameroni sp. nov.) have shown declining populations. The new species is scarcer than all of the sympatric species.