Caucasogeyeria Grego & Mumladze, 2020

Grego, Jozef, Mumladze, Levan, Falniowski, Andrzej, Osikowski, Artur, Rysiewska, Aleksandra, Palatov, Dimitry M. & Hofman, Sebastian, 2020, 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, ZooKeys 955, pp. 1-77 : 1

Genus Caucasogeyeria Grego & Mumladze gen. nov.

Type species.

Caucasogeyeria gloeri Grego & Mumladze, sp. nov.

Species assigned to the genus.

" Geyeria " valvataeformis Starobogatov, 1962, " Geyeria " horatieformis Starobogatov, 1962, C. gloeri Grego & Mumladze, sp. nov., Caucasogeyeria ignidona Grego & Palatov, sp. nov., C. colchis Grego & Mumladze, sp. nov., C. pseudocolchis Grego & Mumladze, sp. nov., C. chrysomallos Grego & Mumladze, sp. nov.

Diagnosis.

The genus is well-separable from all other genera of the region by its conspicuously and deeply sinuated labral and columellar margins. The genus Imeretiopsis gen. nov., has much weaker and morphologically different labral sinuation, and the type species of the genus Kartvelobia gen. nov. has a very differently curled labral margin. The penis simple, long and narrow, different than in the genera mentioned above.

Etymology.

The prefix of the new species Caucaso - is derived from the distribution range of genus in the Caucasus Mountains, and the suffix - geyeria indicating the invalid genus " Geyeria ", previously applied for the genus by Starobogatov (1962). The genus name " Geyeria " was originally dedicated to the famous German malacologist David Geyer (6 November 1855-6 November 1932), who contributed greatly to the documentation of the German malacofauna. It was introduced by A. J. Wagner (1914) for the species " Geyeria " plagiostoma from the Bosna River springs near Sarajevo. However, the genus name proved permanently invalid due to junior homonymy, as it had been previously used by Buchecker in 1876 to name a moth in the family Castniidae Boisduval, 1828, Buckman 1899 for a cephalopod, Carapezzae and Schopen 1899 for a brachiopod, and Fucini 1901 for a cephalopod. Based on the homonymy, Tomlin in 1930 renamed the genus to Plagigeyeria . Later Starobogatov (1962) erroneously applied the invalid genus name to two stygobiotic species from the southwestern Caucasus (" Geyeria " valvataeformis and " G. " horatieformis ). The gender is feminine.

Distribution.

The genus is distributed on the Pakhe Plateau (situated S of Askhi Plateau) and in springs emerging around its slopes as well as at spring emerging from limestone massif north of Mukhuri settlement (Fig. 13 ).

Figures

Figure 13. Distribution map of Caucasogeyeria gen. nov. 0 C. valvataeformis (Starobogatov, 1962) (magenta dot) 4. C. horatiaeformis (Starobogatov, 1962) (turquoise dot) 16 - 22 C. gloeri sp. nov. (blue dots) 27, 28 C. cf. gloeri (light blue dots) 7 C. ignidona sp. nov. (purple dot) 20, 22, 23 C. colchis sp. nov. (red dots) 26, 28 C. pseudocolchis sp. nov. (black dots) 27, 29 C. chrysomallos sp. nov. (green dots).