Allogalumna indonesiensis, 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 of Indonesia. 1. The genus Allogalumna (Galumnidae) with descriptions of two new species (Acari, Oribatida), ZooKeys 529, pp. 71-86 : 72-73

Taxon classification Animalia Oribatida Galumnidae

Allogalumna indonesiensis sp. n. Figs 1, 2, 3-4, 5-9

Diagnosis.

Body size: 282-298 × 215-232. Rostral, lamellar and interlamellar setae minute. Bothridial setae with unilaterally dilated, densely ciliate head. Anterior notogastral margin not developed. Four pairs of porose areas rounded. Median pore absent. Postanal porose area elongate oval.

Description.

Measurements. Body length: 282 (holotype: male), 282-298 (five paratypes: two females and three males); notogaster width: 215 (holotype), 215-232 (five paratypes). Without sexual dimorphism.

Integument. Body color brown. Body surface, pteromorphs, subcapitular mentum, genital and anal plates, and legs smooth.

Prodorsum (Figs 1, 3, 5). Rostrum broadly rounded. Sublamellar lines (S) distinct, curving backwards. Rostral (ro), lamellar (le) and interlamellar (in) setae minute (all 4), thin, smooth. Bothridial setae (bs) comparatively short (49-53), with unilaterally dilated, densely ciliate head. Exobothridial setae and their alveoli absent. Porose areas Ad elongate oval, transversally oriented (16-20 × 6-8).

Notogaster (Figs 1, 3, 4). Anterior notogastral margin not developed. Dorsophragmata (D) of medium size, elongated longitudinally. Notogastral setae represented by 10 pairs of alveoli. Four pairs of porose areas rounded, with distinct margins: Aa (16-18) usually slightly larger than A1, A2 and A3 (all 12-16). Setal alveoli la inserted posteriorly to Aa. Median pore absent in males and females. All lyrifissures (ia, im, ip, ih, ips) distinct, im located between setal alveoli lm and lp. Opisthonotal gland openings (gla) located laterally to A1.

Gnathosoma (Fig. 6). Morphology of subcapitulum, palps and chelicerae typical for most Galumnidae (for example, see Engelbrecht 1969, 1972; Ermilov and Anichkin 2010, 2011; Ermilov et al. 2011, 2013b; Bayartogtokh and Akrami 2014). Subcapitulum size: 61-69 × 61-69. Subcapitular setae setiform, smooth, a (10-12) longer than m (6-8) and h (4), a thickest, h thinnest. Two pairs of adoral setae (or1, or2, 8) thin, indistinctly barbed. Palps (57) with typical setation: 0 –2–1–3– 9(+ω). Axillary sacculi (sac) distinct. Chelicerae (77) with two setiform, barbed setae; cha (28) longer than chb (16). Trägårdh’s organ long, tapered.

Epimeral and lateral podosomal regions (Fig. 2). Anterior tectum of epimere I smooth. Apodemes 1, 2, sejugal and 3 well visible. Four pairs of short (all 4), thin setae, setal formula: 1 –0–1– 2. Pedotecta II (Pd II) scale-like in lateral view, rounded distally in ventral view. Discidia (dis) sharply triangular. Circumpedal carinae (cp) distinct, directed slightly laterally to setae 3b.

Anogenital region (Figs 2, 4, 7, 8). Six pairs of genital (g1, 8; g2-g6, 4), one pair of aggenital (ag, 4), two pairs of anal (an1, an2, 4) and three pairs of adanal (ad1-ad3, 4) setae thin, smooth. Two genital setae on anterior edge of each genital plate. Adanal setae ad3 inserted laterally to adanal lyrifissures (iad). Postanal porose area (Ap) elongate oval, transversally oriented (28-32 × 6-8).

Legs (Fig. 9). Morphology of leg segments, setae and solenidia typical for most Galumnidae (for example, see Engelbrecht 1969, 1972; Ermilov and Anichkin 2010, 2011; Ermilov et al. 2011; Bayartogtokh and Akrami 2014). Tridactylous; claws smooth. Formulas of leg setation and solenidia: I (1 –4–3–4– 20) [1 –2– 2], II (1 –4–3–4– 15) [1 –1– 2], III (1 –2–1–3– 15) [1 –1– 0], IV (1 –2–2–3– 12) [0 –1– 0]; homology of setae and solenidia indicated in 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 HJ2 (project site number), 01°49'31.9"S, 103°17'39.2"E, 84 m a.s.l., from forest floor litter material. Two paratypes (female and male): Indonesia, Sumatra, Bukit Duabelas landscape, secondary rainforest, research site BF1, 01°59'42.5"S, 102°45'08.1"E, 83 m a.s.l., from forest floor litter material. Three paratypes (female and two males): Indonesia, Sumatra, Bukit Duabelas landscape, Jungle rubber agroforest, research site BJ5, 02°08'35.6"S, E 102°51'04.7"E, 51 m a.s.l., from upper soil layer (0-5 cm). All specimens were collected by Bernhard Klarner (15.XI.2013) and determined and collected to morphospecies level by Dorothee Sandmann.

Type deposition.

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

Etymology.

The specific name indonesiensis refers to the country of origin, Indonesia.

Remarks.

Allogalumna indonesiensis sp. n. is most similar to Allogalumna borhidii Balogh & Mahunka, 1979 from the Neotropical region (see Balogh and Mahunka 1979), Allogalumna quadrimaculata (Mahunka, 1988) from Malaysia (see Mahunka 1988), Allogalumna rotundiceps Aoki, 1996 from Japan and Vietnam (see Aoki 1996) and Allogalumna plowmanae Balogh & Balogh, 1983 from Australia (see Balogh and Balogh 1983) in having small body size, minute prodorsal setae, four pairs of rounded notogastral porose areas and bothridial setae with unilaterally dilated head. However, the new species differs from these species by having densely ciliate bothridial heads (versus slightly barbed in distal parts), larger body size (282-298 × 215-232 versus 243-264 × 193-202 in Allogalumna borhidii , 249 × 1662 in Allogalumna quadrimaculata , 212-219 × 155-160 in Allogalumna rotundiceps and 261 × 171 in Allogalumna plowmanae ) and absence of a median pore (versus present in Allogalumna borhidii , Allogalumna quadrimaculata and Allogalumna rotundiceps ).