Pergalumna paraindistincta, 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. 2. The genus Pergalumna (Galumnidae) with description of a new species and key to known species in the Oriental region (Acari, Oribatida), ZooKeys 529, pp. 87-103 : 87-91

Taxon classification Animalia Oribatida Galumnidae

Pergalumna paraindistincta sp. n. Figs 1, 2, 3-4, 5-9

Diagnosis.

Body size: 415-481 × 298-365. Rostral, lamellar and interlamellar setae well developed, barbed. Bothridial setae long, setiform, ciliate. Anterior notogastral margin not developed. Three pairs of elongate oval porose areas on notogaster, Aa transversally oriented, located between la and lm, A1 longitudinally oriented. Median pore single, large. Adanal setae ad1 of medium size, straight, heavily barbed. Postanal porose area absent.

Description.

Measurements. Body length: 431 (holotype: male), 415-481 (10 paratypes: three females and seven males); notogaster width: 298 (holotype), 298-365 (10 paratypes). Without sexual dimorphism.

Integument. Body color brown. Body surface microgranulate, visible under high magnification, × 1000 (diameter of granules less than 1).

Prodorsum (Figs 1, 3, 5). Rostrum broadly rounded. Lamellar (L) and sublamellar (S) lines distinct, parallel, curving backwards. Rostral (ro, 41-49), lamellar (le, 69-77) and interlamellar (in, 86-90) setae setiform, barbed. Bothridial setae (bs, 114-127) setiform, densely ciliate in medio-distal parts. Exobothridial setae and their alveoli absent. Porose areas Ad narrowly elongate oval, transversally oriented (16-20 × 4).

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. Three pairs of porose areas: Aa clearly bordered, elongate oval, transversally oriented (28-32 × 8-12), A1 distinctly bordered only in anterior part, elongate oval to slightly elongate triangular, longitudinally oriented (57-68 × 12-16), A3 without clear borders, elongate oval (24-28 × 8-12). Areas Aa located between setal alveoli la and lm, equal distanced from them. Median pore present in males and females, comparatively large (diameter 10-16). All lyrifissures (ia, im, ip, ih, ips) distinct, im located antero-laterally to A1. Opisthonotal gland openings (gla) located laterally to A1.

Gnathosoma (Fig. 6). Morphology of subcapitulum, palps and chelicerae typical for Pergalumna (see Engelbrecht 1972; Ermilov and Anichkin 2011a, b). Subcapitulum size: 102-106 × 102-106. Subcapitular setae setiform, slightly barbed, m (14-16) shorter than a and h (both pairs 18-20); a thickest, m thinnest. Two pairs of adoral setae (or1, or2, 12-14) setiform, hook-like distally, barbed. Palps (90-94) with typical setation: 0 –2–1–3– 9(+ω). Axillary sacculi (sac) distinct. Chelicerae (164) with two setiform, barbed setae; cha (41) longer than chb (24). 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. Six pairs of setae, setal formula: 1 –0–2– 3. Setae thin, slightly barbed, 1a, 3c and 4c (24) longer than 3b (10-14) and 4a and 4b (4); 1a thicker than others. Pedotecta II (Pd II) scale-like in lateral view, rounded distally in ventral view. Discidia (dis) sharply triangular. Circumpedal carinae (cp) slightly developed.

Anogenital region (Figs 2, 4, 7, 8). Six pairs of genital (g1, g2, 12; g2-g6, 8), one pair of aggenital (ag, 8), two pairs of anal (an1, an2, 8) and two pairs of adanal setae (ad2, ad3, 8) thin, indistinctly barbed. One pair of adanal setae (ad1, 24-36) thickened, straight, heavily barbed, however, in three paratypes one seta of the ad1 pair is short, as ad2 and ad3 in morphology. Adanal setae ad3 inserted laterally to adanal lyrifissures (iad). Genital plates with two or three setae on anterior edge of each plate. Postanal porose area absent.

Legs (Fig. 9). Morphology of leg segments, setae and solenidia typical for Pergalumna (see Engelbrecht 1972; Ermilov and Anichkin 2011a, b). 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 in posterior part of segments.

Material examined.

Holotype (male): Indonesia, Sumatra, Harapan landscape, secondary rainforest, research site HF1, 02°09'09.9"S, 103°21'43.2"E, 76 m a.s.l., from forest floor litter material. Six paratypes (two females and four males): Indonesia, Sumatra, Harapan landscape, rubber plantation, research site HR2, 01°52'44.5"S, 103°16'28.4"E, 59 m a.s.l., from forest floor litter material. Four paratypes (one female and three males): Sumatra, Indonesia, Harapan landscape, jungle rubber agroforest, research site HJ1, 01°55'40.0"S, 103°15'33.8"E, 51 m a.s.l., from forest floor litter material. All specimens were collected by Bernhard Klarner (15.XI.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; three paratypes are in the collection of the Senckenberg Museum, Görlitz, Germany; seven paratypes are in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia.

Etymology.

The specific name paraindistincta refers to the morphological similarity of the new species to Pergalumna indistincta Ermilov & Anichkin, 2011.

Remarks.

Pergalumna paraindistincta sp. n. is morphologically most similar to Pergalumna indistincta Ermilov & Anichkin, 2011 from Vietnam (see Ermilov and Anichkin 2011b) and Pergalumna sura Balogh, 1997 from the Neotropical region (see Balogh 1997; Ermilov et al. 2014a) in having rounded rostrum, well-developed prodorsal setae, setiform and ciliate of bothridial setae, three pairs of notogastral porose areas, transversally oriented Aa and strongly elongated, longitudinally oriented A1, and the absence of anterior notogastral margin as well as postanal porose area. However, the new species differs from both by the presence of strong adanal setae ad1 (vs. minute in Pergalumna indistincta and Pergalumna sura ) and large, single median pore in females and males (vs. median pore absent in males and represented by several foveae in females in Pergalumna indistincta , and absent in females and males in Pergalumna sura ). Additionally, the new species is smaller than Pergalumna indistincta (415-481 × 298-365 vs. 547-614 × 381-415) and has shorter bothridial setae than Pergalumna sura .

Furthermore, Pergalumna paraindistincta sp. n. is morphologically similar to Pergalumna pertrichosa Mahunka, 1995 from Borneo (see Mahunka 1995) in having a rounded rostrum, well developed prodorsal setae, setiform and ciliate bothridial setae, strong adanal setae ad1, a single median pore, and the absence of an anterior notogastral margin. However, the new species differs from the latter by the smaller body size (415-481 × 298-365 vs. 550-608 × 413-454 in Pergalumna pertrichosa ), presence of three pairs of notogastral porose areas with elongated A1 (vs. four pairs of porose areas with A1 rounded in Pergalumna pertrichosa ) and minute anal setae (vs. well developed in Pergalumna pertrichosa ).