Galumna (Cosmogalumna) areticulata, 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 : 27-28

Taxon classification Animalia Oribatida Galumnidae

Galumna (Cosmogalumna) areticulata sp. n. Figs 38, 39, 40-41, 42-46

Diagnosis.

Body size: 298-315 × 215-249. Transverse band of strong, branched cerotegumental ridges developed in middle part of notogaster and between genital and anal plates, not forming a reticulate pattern, only a few cells present exeptionally. Rostral and lamellar setae short, interlamellar setae represented by alveoli. Bothridial setae clavate. Four pairs of rounded porose areas present on notogaster. Median pore and postanal porose area present.

Description.

Measurements. Body length: 315 (holotype: male), 298-315 (seven paratypes: two females and five males); notogaster width: 249 (holotype), 215-249 (seven paratypes). Without sexual dimorphism.

Integument. Body color brown. Body surface, pteromorphs, genital and anal plates punctate (visible in dissected specimens). Subcapitular mentum smooth. Transverse band of strong, branched cerotegumental ridges developed in the middle part of the notogaster and between the genital and anal plates. These ridges comparatively short and not forming a clear reticulate pattern, only a few cells present exeptionally.

Prodorsum. Rostrum rounded. Lamellar and sublamellar lines parallel, curving backwards. Rostral setae (18-20) thin, smooth, pressed to the surface of prodorsum. Lamellar setae (6-8) minute. Interlamellar setae represented by alveoli. Bothridial setae (53-57) clavate, with long stalk and short head, rounded and smooth to slightly roughened distally. Exobothridial setae and their alveoli absent. Porose areas Ad oval, transversally oriented (6-8 × 4-6).

Notogaster. Anterior notogastral margin developed. Dorsophragmata elongated longitudinally. Four pairs of porose areas rounded, with distinct margins: Aa (12-16) slightly larger than A1, A2 and A3 (all 8-10). 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 lp. Opisthonotal gland openings located laterally to A1.

Gnathosoma. Morphology of subcapitulum, palps and chelicerae typical for Galumna (Cosmogalumna) (see Ermilov et al. 2011; Ermilov and Anichkin 2013). Subcapitulum size: 77-82 × 61-65. Subcapitular setae setiform, indistinctly barbed, h (4) shorter than m (6) and a (10-12), a thickest, h thinnest. Two pairs of adoral setae (6) setiform, hook-like distally, indistinctly barbed. Palps (69) with typical setation: 0 –2–1–3– 9(+ω). Axillary sacculi distinct. Chelicerae (94) 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– 2. Setae thin, smooth, 3b (6) slightly longer than 1a, 4a and 4b (4). Pedotecta II roundly triangular in ventral view. Discidia triangular. Circumpedal carinae distinct, clearly not reaching the insertions of setae 3b.

Anogenital region. Six pairs of genital (g1, g2, 6-8; 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 ad3 inserted antero-laterally to adanal lyrifissures. Postanal porose area oval, transversally oriented (8-12 × 4).

Legs. Morphology of leg segments, setae and solenidia typical for Galumna (Cosmogalumna) (see Ermilov et al. 2011; Ermilov and Anichkin 2013). 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) and two paratypes (one female and one male): Indonesia, Sumatra, Bukit Duabelas landscape, secondary rainforest, research site BF2, 01° 58'55.1"S, 102°45'02.7"E, 77 m a.s.l., in upper soil layer (0-5 cm). Five paratypes (one female and four males): Indonesia, Sumatra, Harapan landscape, jungle rubber agroforest, research site HJ1, 01°55'40.0"S, 103°15'33.8"E, 51 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; six paratypes are deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia.

Etymology.

The specific name areticulata refers to the absence of clear reticulate pattern on the body.

Remarks.

Galumna (Cosmogalumna) areticulata sp. n. is morphologically most similar to Galumna (Cosmogalumna) praeoccupata Subías, 2004 from southern China and Vietnam (see Aoki and Hu 1993; including personal data based on the Vietnamese specimens) in having transverse band of reticulation in the middle part of the notogaster and between genital and anal plates, and the absence of striate and reticulate pattern on the prodorsum and pteromorphs. However, the new species differs from the latter by the presence of strong, branched cerotegumental ridges, which do not form a reticulate pattern (vs. distinct reticulate pattern, represented by small, numerous, dense cells in Galumna (Cosmogalumna) praeoccupata ), minute lamellar setae (vs. well developed in Galumna (Cosmogalumna) praeoccupata ) and the directions of lamellar lines (to anterior tectum of ventral plate vs. to acetabula I in Galumna (Cosmogalumna) praeoccupata ).