© Acarina 2022 9 Acarina 30 (1): 9–12 A NEW SPECIES OF GALUMNA (NEOGALUMNA) (ACARI, ORIBATIDA, GALUMNIDAE) FROM THE PHILIPPINES Sergey G. Ermilov 1* and Leonila Corpuz-Raros 2 1 X-BIO Institute, Tyumen State University, Tyumen, Russia 2 Institute of Weed Science, Entomology and Plant Pathology, College of Agriculture and Food, and Museum of Natural History, the University of the Philippines Los Baños, Los Baños, Philippines * corresponding author; e-mail: ermilovacari@yandex.ru ABSTRACT: One new species of Galumna (Neogalumna) (Oribatida, Galumnidae)—Galumna (Neogalumna) eusebioi sp. n.—is described from the Mount Guiting-guiting Natural Park, Sibuyan Island, Philippines. This species difers from all other known species of the subgenus in the presence of two (vs. one) pairs of notogastral porose areas Aa. KEY WORDS: Mites, taxonomy, morphology, Oriental region. DOI: 10.21684/0132-8077-2022-30-1-9-12 lus included). Formulas 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”. Terminology. Morphological terminology used in this paper follows that of Grandjean (see Ermilov and Klimov 2017 for review and application). Abbreviations. Prodorsum: L—lamellar line; S—sublamellar line; N—prodorsal leg niche; E, T—lateral ridges of prodorsum; ro, le, in, bs—ros- tral, lamellar, interlamellar, and bothridial seta, respectively; Ad—dorsosejugal porose area; D— dorsophragma; P—pleurophragma. Notogaster: c, la, lm, lp, h, p—notogastral setal alveoli; Aal, Aam, A1, A2, A3—notogastral porose areas; ia, im, ip, ih, ips—lyrifssures; gla—opisthonotal gland open- ing. Epimeral and lateral podosomal regions: 1a, 3b, 4a, 4b—epimeral setae; PdI, PdII—pedotectum I, II, respectively; dis—discidium; cir—circum- pedal carina. Anogenital region: g, ag, an, ad— genital, aggenital, anal, and adanal seta, respec- tively; iad—adanal lyrifssure; p.o.—preanal organ; Ap—postanal porose area. SYSTEMATICS Galumna (Neogalumna) eusebioi Ermilov and Corpuz-Raros, sp. n. Figs. 1–4 Diagnosis. Body length: 398. Lamellar line incomplete, straight, thickened. Rostral seta medi- um-sized, slightly barbed; lamellar seta short, thinner than ro, slightly barbed; interlamellar seta INTRODUCTION Our paper describes and illustrates one new oribatid mite (Acari Oribatida) species of the genus Galumna Heyden, 1826 (Galumnidae), subgenus G. (Neogalumna) Hammer, 1973, collected from the Philippines. The subgenus Galumna (Neogalumna) was described by Hammer (1973) as an independent genus, with Neogalumna antenniger Hammer, 1973 as type species. At present, it comprises 14 species, which are distributed collectively in the Afro- tropical, Neotropical and Oriental regions, Samoa and China (Ermilov and Khaustov 2021). The sub- generic diagnosis has been presented by Ermilov and Klimov (2017). An identifcation key to known species of Galumna (Neogalumna) was provided by Ermilov and Khaustov (2021). So far, one species of Galumna (Neogalumna) has been registered in the Philippines (Corpuz- Raros and Ermilov 2019): G. (N.) tolstikovi Er- milov and Anichkin, 2014. MATERIALS AND METHODS Observation and documentation. Specimens 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 notogas- ter. Notogastral width refers to the maximum width of the notogaster in dorsal view (behind ptero- morph). Lengths of body setae were measured in lateral aspect. All body measurements are pre- sented in micrometers (µm). Formulas for leg seta- tion are given in parentheses according to the se- quence trochanter–femur–genu–tibia–tarsus (famu-