Galumna (Galumna) mikoi, Ermilov, Sergey G., Sandmann, Dorothee, Klarner, Bernhard, Widyastuti, Rahaju & Scheu, Stefan, 2015

Ermilov, Sergey G., Sandmann, Dorothee, Klarner, Bernhard, Widyastuti, Rahaju & Scheu, Stefan, 2015, Contributions to the knowledge of oribatid mites (Acari, Oribatida) of Indonesia. 3. The genus Galumna (Galumnidae) with description of a new subgenus and seven new species, ZooKeys 539, pp. 11-51 : 21-26

Taxon classification Animalia Oribatida Galumnidae

Galumna (Galumna) mikoi sp. n. Figs 29, 30, 31-32, 33-37

Diagnosis.

Body size: 258-287 × 184-204. Surface of anogenital region and medio-anterior part of notogaster foveolate, surface of subcapitular mentum, genital and anal plates, antero-lateral parts of pteromorphs and posterior part of notogaster striate. Rostral and lamellar setae of medium size, interlamellar setae minute. Bothridial setae clavate. Anterior notogastral margin developed. Four pairs of rounded porose areas present on notogaster. Median pore and postanal porose area present.

Description.

Measurements. Body length: 258 (holotype: male), 258-287 (three paratypes: two females and one male); notogaster width: 188 (holotype), 184-204 (three paratypes). Without sexual dimorphism.

Integument. Body color brown. Surface of anogenital region and medio-anterior part of notogaster foveolate (diameter of foveolae up to 6). Surface of subcapitular mentum, genital and anal plates, antero-lateral parts of pteromorphs and posterior part of notogaster striate.

Prodorsum. Rostrum rounded. Lamellar and sublamellar lines parallel, curving backwards. Rostral and lamellar setae similar in length (20-24), setiform, slightly barbed. Interlamellar setae minute (1). Bothridial setae (49-57) clavate, with long, smooth stalk and rounded, barbed head. Exobothridial setae and their alveoli absent. Porose areas Ad oval, transversally oriented (6 × 4).

Notogaster. Anterior notogastral margin developed. Dorsophragmata elongated longitudinally. Four pairs of porose areas rounded, with distinct margins: Aa (8-12) larger than A1, A2 and A3 (6-8). Notogastral setae represented by 10 pairs of alveoli, la inserted posteriorly to Aa. Median pore present in all specimens, located between A2. All lyrifissures distinct, im located between lm and A1. Opisthonotal gland openings located laterally to A1.

Gnathosoma. Morphology of subcapitulum, palps and chelicerae typical for Galumna (Galumna) (see Engelbrecht 1969; Ermilov and Anichkin 2010). Subcapitulum size: 73-77 × 65-69. Subcapitular setae a (12-14) setiform, slightly barbed, longer and thicker than minute, smooth m and h (both pairs 4). Two pairs of adoral setae (8) setiform, hook-like distally, barbed. Palps (57) with typical setation: 0 –2–1–3– 9(+ω). Axillary sacculi distinct. Chelicerae (90) with two setiform, barbed setae; cha (32) longer than chb (20). Trägårdh’s organ long, tapered.

Epimeral and lateral podosomal regions. Anterior tectum of epimere I smooth. Apodemes 1, 2, sejugal and 3 well visible. Setal formula: 1 –0–1– 1. Setae thin, smooth, 3b (8-10) longer than 1a and 4a (4). Pedotecta II rounded anteriorly in ventral view. Discidia triangular. Circumpedal carinae distinct, clearly not reach the insertions of setae 3b.

Anogenital region. Six pairs of genital (g1, 8; g2, 6; g3-g6, 4), one pair of aggenital (4), two pairs of anal (4) and three pairs of adanal (4) setae thin, smooth. Three setae on anterior edge of each genital plate. Adanal setae distanced equal from each other, inserted in one diagonal row on each side of adanal region. Adanal setae ad3 inserted postero-laterally to adanal lyrifissures. Postanal porose area oval, transversally oriented (6-10 × 4-6).

Legs. Morphology of leg segments, setae and solenidia typical for Galumna (Galumna) (see Engelbrecht 1969; Ermilov and Anichkin 2010). Tridactylous, claws smooth. Formulas of leg setation and solenidia are similar to Galumna (Atypicogalumna) corpuzrarosae sp. n. (Table 1). Solenidion φ of tibiae IV inserted dorsally at about 2/3 length of segment.

Material examined.

Holotype (male): Indonesia, Sumatra, Harapan landscape, jungle rubber agroforest, research site HJ4, 01°47'07.3"S, 103°16'36.9"E, 57 m a.s.l., in forest floor litter material. Three paratypes (two females and one male): Indonesia, Sumatra, Harapan landscape, secondary rainforest, research site HF4, 02°11'15.2"S, 103°20'33.4"E, 77 m a.s.l., in forest floor litter material. All specimens were collected by Bernhard Klarner (Nov. 2013) and identified and collected to morphospecies level by Dorothee Sandmann.

Type deposition.

The holotype is deposited in LIPI (Indonesian Institute of Science) Cibinong, Indonesia; two paratypes are deposited in the collection of the Senckenberg Museum, Görlitz, Germany; one paratype is deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia.

Etymology.

The specific name is dedicated to our friend and colleague, acarologist, Dr. Ladislav Miko (Czech University of Life Sciences Prague, Charles University in Prague, Prague, Czech Republic).

Remarks.

Galumna (Galumna) mikoi sp. n. is morphologically most similar to Galumna (Galumna) innexa Pérez-Íñigo & Baggio, 1986 from the Neotropical region (see Pérez-Íñigo and Baggio 1986) in having striate pteromorphs, minute interlamellar setae, anterior notogastral margin, four pairs of rounded porose areas on notogaster and median pore. However, the new species differs from the latter by the foveolate notogaster and anogenital region (vs. not foveolate in Galumna (Galumna) innexa ), striate posterior part of notogaster (vs. not striate in Galumna (Galumna) innexa ) and clavate bothridial setae (vs. lanceolate in Galumna (Galumna) innexa ).