Galumna (Cosmogalumna) sumatrensis, 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 : 29-33

Taxon classification Animalia Oribatida Galumnidae

Galumna (Cosmogalumna) sumatrensis sp. n. Figs 47, 48, 49-50, 51-55

Diagnosis.

Body size: 282-298 × 182-215. Reticulate pattern in the middle part of notogaster represented by few large cells, reticulate pattern between genital and anal plates represented by small, numerous, dense cells. Rostral and lamellar setae thin, indistinctly barbed, interlamellar setae represented by alveoli. Bothridial setae clavate. Four pairs of rounded porose areas on notogaster. Median pore absent. Postanal porose area present.

Description.

Measurements. Body length: 282 (holotype: male), 282, 298 (two paratypes: one female and one male); notogaster width: 215 (holotype), 182, 215 (two paratypes). Without sexual dimorphism.

Integument. Body color brown. Body surface, pteromorphs, genital and anal plates, and subcapitular mentum punctate. Reticulate pattern in the middle part of notogaster present, cells large and not numerous. Reticulate pattern between genital and anal plates represented by small, numerous, dense cells.

Prodorsum. Rostrum rounded. Lamellar and sublamellar lines parallel, curving backwards. Rostral (16) and lamellar (10-12) setae thin, indistinctly barbed. Interlamellar setae represented by alveoli. Bothridial setae (49-53) clavate, with long stalk and short head, rounded and barbed distally. Exobothridial setae and their alveoli absent. Porose areas Ad oval, transversally oriented (14-16 × 4-6).

Notogaster. Anterior notogastral margin developed. Dorsophragmata large, elongated longitudinally. Four pairs of porose areas rounded, with distinct margins: Aa (14-16) larger than A1, A2 and A3 (all 8-10). Notogastral setae represented by 10 pairs of alveoli, la inserted posteriorly to Aa. Median pore absent in all specimens. All lyrifissures distinct, im located between lm and A1. Opisthonotal gland openings located antero-laterally to A2.

Gnathosoma. Morphology of subcapitulum, palps and chelicerae typical for Galumna (Cosmogalumna) (see Ermilov et al. 2011; Ermilov and Anichkin 2013). Subcapitulum size: 77 × 65-69. Subcapitular setae setiform, indistinctly barbed, h and m (all 6) shorter than a (12-14), a thickest, h thinnest. Two pairs of adoral setae (8) 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– 1. Setae 1a, 3b and 4a similar in length (4), thin, smooth. 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, 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 laterally to adanal lyrifissures. Postanal porose area oval, transversally oriented (12-20 × 4-8).

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): 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. Two paratypes (one female and one male): Indonesia, Sumatra, Hara pan landscape, secondary rainforest, research site HF4, 02°11'15.2"S, 103°20'33.4"E, 77 m a.s.l., in upper soil layer (0-3 cm). 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; one paratype is 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 sumatrensis refers to the island of origin, Sumatra.

Remarks.

Galumna (Cosmogalumna) sumatrensis 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) and Galumna (Cosmogalumna) areticulata sp. n. from Indonesia in having a 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. The new species differs from Galumna (Cosmogalumna) praeoccupata by the presence of large and not numerous of reticulate cells on notogaster (vs. pattern distinct, represented by small, numerous, dense cells in Galumna (Cosmogalumna) praeoccupata ) and absence of median pore (vs. present in Galumna (Cosmogalumna) praeoccupata ). The new species differs from Galumna (Cosmogalumna) areticulata sp. n. by the presence of reticulate pattern in the anogenital region represented by small, numerous, dense cells (vs. strong, branched cerotegumental ridges, which do not form a reticulate pattern present in Galumna (Cosmogalumna) areticulata sp. n.) and the absence a median pore (vs. present in Galumna (Cosmogalumna) areticulata sp. n.).