To the knowledge of the genus Gephyrazetes ( Acari , Oribatida , Mochlozetidae )

The oribatid mite genus Gephyrazetes (Oribatida, Mochlozetidae) is recorded for the first time in the Ethiopian region; one new species is described from soil and litter of Korup National Park in Cameroon. Gephyrazetes umukusumae sp. nov. differs from G. fasciatus Hirauchi, 1999 by the larger body size, truncate lamellar cusps, setiform bothridial setae, very small notogastral porose areas, paraanal position of adanal lyrifissures, presence of four pairs of genital setae and tuberculate lateral parts of prodorsum, and absence of dorsosejugal and sublamellar porose areas. Revised generic diagnosis and the data on distribution and ecology of Gephyrazetes species are presented.

Among the material collected from Korup National Park of Cameroon, we found one new species of Gephyrazetes; hence, the genus is registered in the Ethiopian region for the first time.The main goal of this paper is to describe and illustrate a new species, revise generic diagnosis and give information on distribution and ecology of Gephyrazetes.This work is part of our study on the oribatid fauna of Cameroon (e.g.Ermilov & Koehler 2017).
Ecologica Montenegrina 16: 34-41 (2018) This journal is available online at: www.biotaxa.org/emMethods: Specimens were mounted in lactic acid on temporary cavity slides for measurement and illustration.The body length was measured in lateral view, from the tip of the rostrum to the posterior edge of the ventral plate.Notogastral width refers to the maximum in dorsal aspect.Lengths of body setae were measured in lateral aspect.All body measurements are presented in micrometers.Formulas for leg setation are given in parentheses according to the sequence trochanter-femur-genu-tibia-tarsus (famulus included).Formulas for leg solenidia are given in square brackets according to the sequence genu-tibia-tarsus.Morphological terminology used in this paper follows that of F. Grandjean: see Travé & Vachon (1975) for references, Norton (1977) for leg setal nomenclature, and Norton & Behan-Pelletier (2009), for overview.Drawings were made with a camera lucida using a Leica transmission light microscope "Leica DM 2500".
Type deposition.The holotype (in ethanol with drop of glycerol) is deposited in SMNH.The paratype (in ethanol with drop of glycerol) is deposited in TSUMZ.
Etymology.The species name is dedicated to the well-known acarologist Dr. Umukusum Ya.Shtanchaeva (Universidad Complutense de Madrid, Madrid, Spain), to acknowledge her extensive contributions to our knowledge of oribatid mites.
Remarks.The known species of Gephyrazetes-G.umukusumae sp.nov.and G. fasciatus Hirauchi, 1999-can be distinguished by morphological traits listed in Table 2.

Table 2 .
Hirauchi, 1999.ifferences between Gephyrazetes umukusumae sp.nov.andG.fasciatusHirauchi,1999.At present, both species of Gephyrazetes have restricted distributions and are known only from their type localities.Gephyrazetes fasciatus was recorded from litter and soil of Betula ermanii forest in the Tanbodaira, Tyoama Prefecture in Japan.Gephyrazetes umukusumae sp.nov. is found from litter and soil of Korup National Park in Cameroon.theRussian Foundation for Basic Research (RFBR) according to the research project № 18-04-00096 and by the Academy of Sciences of the Czech Republic, under Research Plan No. AV0Z606960521.