A new leech species Trocheta ariescornuta n. sp. is described and illustrated here based on two specimens found in Motena Cave in western Georgia, Caucasus. This species differs from the known congeners and other similar Erpobdellids of the region, including Georgian cavernicolous leech - Dina ratschaensis Kobaķhidze, 1958 in a complex of external and internal morphological characteristics: colour, annulation, position of genital pores, shape of the genital atrium with strong coiled cornua (similar to the horns of a ram). Cave inhabitant invertebrate community for Motena Cave is provided.

Two highly specialized endemic troglobiotic harvestman species of the genus Nemaspela Šilhavý, 1966 are described. N. melouri sp. nov. from Melouri Cave and N. prometheus sp. nov. from Prometheus Cave (Sataplia-Tskaltubo karst massif, Imereti region, western Georgia), respectively. Despite the fact that the entrances of the caves are positioned only 2.5 km apart, the new taxa differ from each other distinctly by presence vs. absence of male cheliceral apophysis, which is lacking in the second species. A key to the Caucasian species of the genus is provided. Relationships of Nemaspela species within the genus and with hypothetical epigean ancestors are discussed.

No abstract

Prometheus Cave is one of the largest caves in Georgia among the local six show caves. Before opening the cave as a tourist attraction, no research was conducted on the cave to study the invertebrate community living there, despite the cave's status as a natural monument. Before our study, only 22 species of invertebrates were known from Prometheus Cave, while none of the invertebrate species have been reported from adjacent non-touristic Datvi and Melouri caves. Cave invertebrate fauna was monitored monthly from 2018 to 2021 in the Prometheus cave and adjacent non-touristic Datvi and Melouri caves. The sampling was conducted on at least ten sites per cave each month. The abundance and incidence of the invertebrates were recorded on each site during field surveys. We ordinated the invertebrate diversity of the studied caves using Principal Component Analysis (PCA). After intensive investigations for three years, the number of species in Prometheus Cave increased from 22 to 47. Besides, ten species in Datvi and 11 species in Melouri caves were found for the first time. Our results suggest the existence of a significant difference in the diversity of the cave invertebrate fauna between the touristic part of Prometheus show Cave and its non-touristic part - Alpinist's hall, Datvi, and Melouri caves. The primary factor differentiating Prometheus show Cave from the others is the lower abundance of the species. Hurlbert's PIE and rarefaction analysis of the diversity explains that the diversity is also most unevenly distributed in this cave.

A new dipluran species, Plusiocampa (Plusiocampa) imereti Sendra & Barjadze sp. nov., from the deep zone in three caves in the Imereti region, Georgia, is described. This new troglobitic Plusiocampa is an addition to four others known Diplura from around the Black Sea region, two Dydimocampa and two Plusiocampa s. str. The present study also provides the first CO1 sequences for the Plusiocampinae taxa and the first molecular data for cave-dwelling Plusiocampa species. Although bootstrap values were low, the maximum-likelihood phylogenetic tree grouped Plusiocampa (P.) imereti Sendra & Barjadze sp. nov. with two Plusiocampa s. str. species from Eastern Europe. Morphologically, P. (P.) imereti Sendra & Barjadze sp. nov. is closely related to two cave-dwelling species: Plusiocampa (Plusiocampa) glabra Condé, 1984 and Plusiocampa (P.) chiosensis Sendra & Gasparo, 2020. The new species can be distinguished by the presence of lateral anterior macrosetae on metanotum, more uneven claws, and the presence of 2+2 lateral anterior macrosetae on middle urotergites. The five species currently known for the Black Sea region inhabit caves located at low altitude but with no influence from former glacial or permafrost processes.