Pergalumna (Pergalumna) capualensis, Ermilov, Sergey G. & Corpuz-Raros, Leonila, 2016

Ermilov, Sergey G. & Corpuz-Raros, Leonila, 2016, New species and records of Galumnidae (Acari, Oribatida) from the Philippines, Zootaxa 4171 (1), pp. 77-100 : 79-84

Pergalumna (Pergalumna) capualensis sp. nov.

( Figs 1–12 )

Diagnosis. Body size: 863–929 × 664–697. Body surface microgranulate. Rostrum rounded. Rostral and lamellar setae long, barbed, le inserted on strong triangular teeth. Interlamellar setae minute. Bothridial setae setiform, indistinctly barbed. Sejugal and postanal porose areas and median pore present. Anterior notogastral margin not developed medially. Three pairs of porose areas rounded, Aa located between setal alveoli la and lm, nearer to the latter. Subcapitular setae a longer and thicker than m and h. Epimeral formula: 2–0–3–3. Circumpedal carinae directed to pedotecta I.

Description. Measurements. Species with very large body size. No clear differences between females and males, but females usually larger. Body length: 863 (holotype: female), 863–929 (10 paratypes: 7 females and 3 males); notogaster width: 680 (holotype), 664–697 (10 paratypes).

Integument ( Figs 1–4 , 9, 10 ). Body color light brown to black. Surface densely microgranulate (diameter of granules up to 1). Centro-basal part of prodorsum and lateral parts of pteromorphs with indistinct, sparse, small foveoles (diameter of foveoles up to 4). Ventral side with two lateral, transverse striate bands between genital and anal plates.

Prodorsum ( Figs 1–4 , 7–9 ). Rostrum slightly protruding, rounded. Lamellar (L) and sublamellar (S) lines welldeveloped, thin, parallel, curving backwards. Rostral (ro, 73–77) and lamellar (le, 69–73) setae setiform, barbed, directed antero-medially; le inserted on strong triangular teeth (t). Interlamellar setae (in, 6–8) thin, smooth. Bothridial setae (bs, 118–127) setiform, thickened, indistinctly barbed, directed postero-laterad. Exobothridial setae and their alveoli absent. Sejugal porose areas (Ad) oval (10–12 × 6–8), transversely oriented.

Notogaster ( Figs 1 , 3, 5 , 9, 10 ). Anterior notogastral margin not developed medially. Dorsophragmata (D) elongated longitudinally. Notogastral setae represented by 10 pairs of alveoli. Three pairs of porose areas rounded, with clear borders: A1 (16–20) larger than Aa and A3 (both pairs 10–12). Porose areas Aa located between setal alveoli la and lm, nearer to the latter. Median pore (mp) present in males and females, large (similar to Aa and A 3 in size), inserted posterior to the virtual line connected porose areas A1. All lyrifissures (ia, im, ip, ih, ips) distinct, im located anterior to A1 and slightly distanced from them. Opisthonotal gland openings (gla) located laterally to A1.

Gnathosoma ( Fig. 6 ). Morphology of subcapitulum, palps and chelicerae as described in Galumna Heyden, 1826 and Pergalumna Grandjean, 1936 (e.g. Engelbrecht 1969; Ermilov & Anichkin 2011; Ermilov et al. 2011, 2014 c; Bayartogtokh & Akrami 2014). Subcapitulum size: 205–221 × 180–188. Subcapitular setae setiform, slightly barbed, a (28–36) longer and thicker than m (24–32) and h (16–20). Two pairs of adoral setae (or 1, or 2, 20– 28) setiform, heavily barbed. Palp length: 159–164. Palp formula is typical (0–2–1–3–9+1ω). Axillary saccules distinct, elongated. Chelicera length: 261–270. Cheliceral setae setiform, barbed, cha (69–73) longer than chb (53– 57). Trägårdh’s organ elongate triangular, rounded distally.

Epimeral and lateral podosomal regions ( Figs 2 , 3 , 11 ). Anterior margin of epimere I smooth. Setal formula: 2–0–3–3. Setae 3c and 4c (41–53) longer than 1b (36–45), 3b (22–24) and 4a and 4b (12), all slightly barbed, setae 1a and 3a minute (2), smooth, poorly visible. Pedotecta II (Pd II) trapezoid distally in ventral view. Discidia (dis) sharply triangular. Circumpedal carinae (cp) directed to pedotecta I.

Anogenital region ( Figs 2 , 11 ). Six pairs of genital (g 1, 28–36; g 2, 24–32; g 3, 16–24; g 4– g 6, 10–14), one pair of aggenital (ag, 8), two pairs of anal (an 1, an 2, 8) and three pairs of adanal (ad 1– ad 3, 8) setae setiform, thin, slightly barbed. Genital plates with three genital setae on anterior edges, g 1 and g 2 inserted close to each other and distanced from g 3. Aggenital setae inserted between genital and anal apertures, clearly nearer to the former. Adanal lyrifissures (iad) located close and parallel to anal plates. Setae ad 3 inserted laterally or antero-laterally to iad. Distance ad 1– ad 2 shorter than ad 2– ad 3. Postanal porose area (Ap) present, oval (16–18 × 6–8), transversely oriented.

Legs ( Fig. 12 ). Morphology of leg segments, setae and solenidia as described in Galumna Heyden, 1826 and Pergalumna Grandjean, 1936 (e.g. Engelbrecht 1969; Ermilov & Anichkin 2011; Ermilov et al. 2011, 2014 c; Bayartogtokh & Akrami 2014). Claws strong, serrate on dorsal sides, median claw (cl m) slightly thicker than laterals (antiaxial (cl a) and paraxial (cl p) claws). 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 . Solenidia φ of tibiae IV inserted dorsally in distal part of segments.

Material examined. Holotype (female) and 8 paratypes (5 females and 3 males): Luuk municipality in Capual Island, Sulu Province , Philippines, 13 December 2003, collected by C. Espanola, sample of litter in mangrove forest. Other material : 1 female: Sibulan watershed, Polillo municipality, Polillo Island, Quezon Province , Philippines, 27 September 2003, collected by Ireneo L. Lit, Jr. and Orlando L. Eusebio, sample of decaying log ; 1 female: Mt. Malindang, Barangay Lake Duminagat, Don Victoriano municipality, Misamis Occidental Province, Mindanao Island , Philippines, 16 August 2001, collected by William Sm. Gruezo, sample of leaf litter from secondary forest.

Type deposition. The holotype (alcohol) and two paratypes (alcohol) are deposited in the collection of the Senckenberg Institute, Görlitz, Germany; 6 paratypes (alcohol) and other material (2 specimens) (alcohol) are in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia.

Etymology. The specific name capualensis refers to the Philippine Island, Capual, where the holotype and the majority of paratypes were collected.

Remarks. Pergalumna (Pergalumna) capualensis sp. nov. is morphologically most similar to P. (Pergalumna) bimaculata Hammer, 1973 from Tonga Islands and the Philippines and P. (Pergalumna) remota ( Hammer, 1968) from New Zealand and India in having setiform bothridial setae, three pairs of notogastral porose areas, localization of porose areas Aa (near setal alveoli lm), very large median pore and the absence of anterior margin of notogaster. However, the new species differs from both by the larger body length (863–929 vs. 720 in P. (P.) bimaculata and 670 in P. (P.) remota ) and the presence of strong teeth on prodorsum (vs. absent).

Note: Roman letters refer to normal setae, Greek letters to solenidia (except ɛ = famulus). Single prime (') marks setae on the anterior and double prime (") setae on the posterior side of a given leg segment. Parentheses refer to a pair of setae. Tr—trochanter, Fe—femur, Ge—genu, Ti—Tibia, Ta—tarsus.

Figures

FIGURE 1. Pergalumna (Pergalumna) capualensis sp. nov., adult: dorsal view. Scale bar 200 µm.

FIGURE 2. Pergalumna (Pergalumna) capualensis sp. nov., adult: ventral view (subcapitulum and legs not shown). Scale bar 200 µm.

FIGURES 3 – 6. Pergalumna (Pergalumna) capualensis sp. nov., adult: 3 — anterior part of body, lateral view (subcapitulum and legs not shown); 4 — rostrum, frontal view; 5 — posterior view (pteromorphs not shown); 6 — anterior part of subcapitulum, ventral view. Scale bars 200 µm (3 – 5), 50 µm (6).

FIGURES 7 – 12. Pergalumna (Pergalumna) capualensis sp. nov., adult, microscope images: 7 — part of prodorsum, lateral view; 8 — bothridial seta; 9 — part of sejugal region, right half; 10 — part of pteromorph; 11 — part of podosomal region, ventral view; 12 — leg claws on tarsus III, left, antiaxial view. Scale bars 50 µm.

Tables

TABLE 1. Leg setation and solenidia of adult Pergalumna (Pergalumna) capualensis sp. nov., Setogalumna minisetosa sp. nov., Trichogalumna interlamellaris sp. nov. and Pergalumna (Pergalumna) crassipora Mahunka, 1995.

Leg	Tr	Fe	Ge	Ti	Ta
I	v'	d, (l), bv''	(l), v', σ	(l), (v), φ1, φ2	(ft), (tc), (it), (p), (u), (a), s, (pv), v', (pl), l'', ɛ, ω1, ω2
II	v'	d, (l), bv''	(l), v', σ	(l), (v), φ	(ft), (tc), (it), (p), (u), (a), s, (pv), ω1, ω2
III	v'	d, ev'	l', σ	l', (v), φ	(ft), (tc), (it), (p), (u), (a), s, (pv)
IV	v'	d, ev'	d, l'	l', (v), φ	ft'', (tc), (p), (u), (a), s, (pv)