Subterranean Deuteraphorura Absolon, 1901, (Hexapoda, Collembola) of the Western Carpathians - Troglomorphy at the northern distributional limit in Europe.

An integrative approach employing molecular, morphological and geographical data were applied to species delimitation among Deuteraphorura congeners occupying caves of the Western Carpathian Mts. A new species of Deuteraphorura from the Western Carpathians is described. D.

New species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from a superficial subterranean habitat at Dobšinská Ice Cave, Slovakia.

New species of Megalothorax Willem, 1900 from Dobšinská Ice Cave, Slovakia, M. dobsinensis sp. n.

Morphological and cytogenetic characteristics of Neobisium (Blothrus) slovacum Gulička, 1977 (Pseudoscorpiones, Neobisiidae), the northernmost troglobitic species of the subgenus Blothrus in Europe.

A redescription is provided of the adult, tritonymph and deutonymph life stages of the troglobitic Neobisium (Blothrus) slovacum Gulička, 1977, which is known from Slovakia and Hungary. Material examined included 35 previously deposited museum specimens and 15 newly collected specimens. In addition, the karyotype and distribution of 18S rDNA clusters are described, using fluorescence in situ hybridization (FISH).

Genus Neelus Folsom, 1896 (Hexapoda, Collembola) reveals its diversity in cave habitats: two new species from Croatia.

Two new species of the genus Neelus Folsom, 1896, N. cvitanovici sp. nov.

A new genus of Neelidae (Collembola) from Mexican caves.

The new genus Spinaethorax, whose proposal is based on specimens of Megalothorax spinotricosus Palacios-Vargas & Sánchez, 1999, is given a new name combination and a redescription. The type species comes from two caves in Campeche State, México. A new combination is also suggested for Megalothorax tonoius Palacios-Vargas & Sánchez, 1999.

The genus Hylebainosoma Verhoeff, 1899 (Diplopoda, Chordeumatida, Haaseidae): redescription of Hylebainosoma tatranum, description of a new troglobiont species and notes to the Hylebainosoma-Romanosoma species group.

A revision of the taxonomy, distribution and ecology of the millipedes of the genus Hylebainosoma Verhoeff, 1899 in the Carpathians is presented. Based on the study of numerous specimens, we consider the subspecies of the species                 Hylebainosoma tatranum Verhoeff, 1899 described in the past as overrated, reflecting simply intrapopulational variation attributable to the rather extended area of species distribution, different habitats of its occurrence (surface and cave habitats, soil, litter and stony debris) and wide altitudinal range from the forest zone in foothills to the alpine zone above timberline. Besides the redescription of males, the morphology of female vulvae is presented for the first time.

Four new troglobiotic species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from the Carpathian Mountains (Slovakia, Romania).

Four new species of Megalothorax Willem, 1900 are described and illustrated: M. tatrensis sp. nov.