A new species of Notogalumna (Acari, Oribatida, Galumnidae) from the oriental region with a key to known species

A new galumnid mite species, Notogalumna lagunaensis n. sp., is described from the Philippines and Vietnam. It is morphologically most similar to N. africana Mahunka, 1988, but differs from the latter by the smaller body size and location of lamellar setae between lamellar lines. Notogalumna is recorded from the Philippines for the first time. A new diagnosis and an identification key to the known species of this genus are provided.

During taxonomic study of oribatid collections from the Museum of Natural History (University of the Philippines Los Baños) and the Joint Russian-Vietnamese Biological expedition (October 2013-April 2014 in forest zones of southern Vietnam, a new species of the genus Notogalumna was discovered. The main goal of our paper is to describe and illustrate it. Additionally, we provide an identification key for all known species of this genus, and propose a new generic diagnosis.

MATERIALS AND METHODS
We examined five specimens (holotype: female; four paratypes: two females and two males) with data as follows: Philippines, Luzon Island, Laguna Province, San Pablo City, in coconut leaves infested with coconut scale insect, Aspidiotus rigidus Reyne, 31 March 2014 (M.V. Navasero and M.M. Navasero). In addition, two paratype specimens (one female and one male) collected from: Vietnam, Dong Nai Province, Dong Nai Biosphere Reserve, in mosses and ferns on stones near Dong Nai river, 31 September 2013 (A.E. Anichkin and S.G. Ermilov).
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 width 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-genutibia-tarsus (famulus included). Formulas for leg solenidia are given in square brackets according to the sequence genu-tibia-tarsus. General terminology used in this paper follows that of F. Grandjean (summarized by Norton and Behan-Pelletier 2009). Drawings were made with a drawing tube using a Carl Zeiss transmission light microscope "Axioskop-2 Plus".

Genus Notogalumna Sellnick, 1959
Type species: Notogalumna praetiosa Sellnick, 1959 Diagnosis -Galumnidae with body hexagonal, truncated posteriorly; lamellar and sublamellar lines present, thin, curving backwards in mediodistal parts; bothridial setae setiform or clavate; lamellar setae inserted between lamellar and sublamellar lines or between lamellar lines; notogaster with 10 pairs of alveoli, each pteromorph with one alveolus; notogaster with three to four pairs of porose areas, A1 usually large, boomerang-shaped; adanal lyrifissures located near anal aperture, in paraanal position; three pairs of adanal and two pairs of anal setae or alveoli present (except three pairs of anal alveoli in N. praetiosa); leg tarsi with three claws; sexual dimorphism absent.
Integument -Body color brown, covered by cerotegumental microgranules (less than 1, but well visible under high magnification in dissected specimens). Notogaster and anogenital region with small, round foveolae (up to 4). Ventral side with two transverse striate bands (sb) located laterally between genital and anal plates, and one arcuate striate band located posteriorly to anal plates, extending into the ano-adanal region.

Leg
Trochanter Femur Genu Tibia Tarsus Roman letters refer to normal setae, Greek letters to solenidia (except ɛ = famulus). Single prime (' ) marks setae on anterior and double prime ('' ) setae on posterior side of the given leg segment. Parentheses refer to a pair of setae.
Type deposition -The holotype is deposited in the collection of the Senckenberg Institution Frankfurt, Germany; four paratypes are deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia; two paratypes are deposited in the Museum of Natural History, University of the Philippines Los Baños, College, Laguna, Philippines.
Etymology -The specific name "lagunaensis" refers to the Philippine Province origin, Laguna.