New and interesting species of the genera Galumna and Pergalumna (Acari, Oribatida, Galumnidae) from the Montagne d’Ambre National Park, Madagascar

This work includes taxonomic and faunistic data on galumnid mites (Oribatida, Galumnidae) belonging to the genera Galumna and Pergalumna collected from the Montagne d’Ambre National Park, North Madagascar. Two new species are described: Galumna sandormahunkai n. sp. differs from its closest species, Galumna sphagni by the larger body size, the presence of strongly protruding rostrum, lanceolate, pointed apically bothridial setae, the direction of lamellar lines, and the absence of median pore; Pergalumna janosbaloghi n. sp. differs from the most similar species, Pergalumna aegra, by the smaller body size and the presence of long lamellar setae and elongate, distinctly or slightly triangular porose areas Aa. Galumna granalata and Pergalumna amamiensis are recorded in the Ethiopian region for the first time; Pergalumna conspicua and P. frater are recorded in Madagascar for the first time.


Introduction
This work is based on oribatid mite (Acari, Oribatida) material, which was collected from the Montagne d'Ambre National Park (Madagascar), and includes data on the genera Galumna Heyden, 1826 andPergalumna Grandjean, 1936 of the family Galumnidae.
During taxonomic identification, we found eight species; of these, two species are new to science. The primary goal of this paper is to describe these new species and to provide the list of identified species.

Material and methods
The studied galumnid mites were collected in the Montagne d'Ambre National Park, North Madagascar, during long-term official cooperation between the Moravian Museum in Brno (Czech Republic) and Université d'Antananarivo (Madagascar) in 2010-2014. Specimens (all exemplars were studied and measured) were mounted in lactic acid on temporary cavity slides for measurement and illustration. Body length was measured in lateral view, from the tip of the rostrum to the posterior edge of the notogaster. Notogastral width refers to the maximum width of the notogaster in dorsal view (behind pteromorphs). Lengths of body setae were measured in lateral aspect. All body measurements are presented in micrometers. Formulae for leg setation are given in parentheses according to the sequence trochanter-femur-genu-tibia-tarsus (famulus included). Formulae for leg solenidia are given in square brackets according to the sequence genu-tibia-tarsus.
Drawings were made with a camera lucida using a Leica transmission light microscope "Leica DM 2500".
Morphological terminology used in this paper follows that of F. Grandjean (see Ermilov & Klimov 2017 for review and application).
Integument -Body color light brown to brown. Body surface densely microgranulate, granules (less than 1) poorly developed (visible only at high magnification x1000). Antiaxial sides of all leg femora and trochanters III, IV with rounded and elongated tubercles.
Type deposition -The holotype and two paratypes are deposited in the collection of the Senckenberg Institute, Görlitz, Germany. Eleven paratypes are deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia. All specimens are preserved in ethanol with drop of glycerol.
Etymology -The new species is named after late Prof. Dr. S. Mahunka, the Hungarian acarologist, for his extensive contributions to our knowledge of oribatid mites.
Remarks -In the presence of long rostral and lamellar setae, short interlamellar setae, long bothridial setae with developed head, complete dorsosejugal suture, and four pairs of rounded notogastral porose areas, Galumna sandormahunkai n. sp. is morphologically most similar to Galumna sphagni Ermilov, Hugo-Coetzee and Theron, 2018 from South Africa, but differs from the letter by the larger body size (780-996 × 564-780 versus 415-431 × 315-332), the presence of strongly protruding rostrum (versus not protruding), lanceolate, pointed apically bothridial setae (versus unilaterally dilated, rounded apically), the direction of lamellar lines to lateral sides of the prodorsum (versus anterior part of the ventral plate), and the absence of median pore (versus present).

Leg
Tr Fe Ge Ti Ta
Integument -Body color light brown to brown. Body surface densely microgranulate, granules (up to 1) well visible even at low magnification × 400). Antiaxial sides of all leg femora and trochanters III, IV with rounded and elongated tubercles.
Legs (Figs 6a, 6b) Table 1. Famulus on tarsi I inserted between solenidia ω 1 and ω 2 . Solenidion on tibiae IV inserted in anterior part of the segment.  acarologist, for his extensive contributions to our knowledge of oribatid mites. Remarks -In the presence of short interlamellar setae, setiform bothridial setae, interrupted medially dorsosejugal suture, and three pairs of notogastral porose areas with Aa elongated transversely oriented, Pergalumna janosbaloghi n. sp. is morphologically most similar to Pergalumna aegra Pérez-Íñigo and Baggio, 1986 from Brazil and India, but differs from the letter by the smaller body size (290-298 × 232-249 versus 468 × 408) and the presence of long lamellar setae (versus short) and triangular porose areas Aa (versus elongate oval).

Other identified species of Galumna and Pergalumna
(with same locality data as both new species)