Trichogalumna interlamellaris, 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 : 88-92

Trichogalumna interlamellaris sp. nov.

( Figs 19–31 )

Diagnosis. Body size: 581–830 × 448–597. Rostrum rounded. Rostral, lamellar and interlamellar setae long, barbed, in with attenuate tips. Bothridial setae long, lanceolate, slightly barbed. Sejugal and postanal porose areas present. Anterior notogastral margin developed. Three pairs of oval and rounded porose areas. Setal alveoli la located postero-laterally to Aa. Median pore absent. Subcapitular setae m shorter and thinner than a and h. Epimeral formula: 1–0–1–3. Circumpedal carinae directed to setae 3b.

Description. Measurements. Species with large and variable body size. Females larger than males. Body length: 830 (holotype: female), 664–713 (7 paratypes: 7 females), 581–614 (2 paratypes: 2 males); notogaster width: 597 (holotype), 514–547 (7 paratypes: 7 females), 448–464 (2 paratypes: 2 males).

Integument. Body color yellow to light brown. Surface densely microgranulate (diameter of granules up to 1). Genital plates striate.

Prodorsum ( Figs 19–22 , 25–28 ). Rostrum broadly rounded. Lamellar and sublamellar lines thin, parallel, curving backwards, L thickened in some specimens. Rostral (53–61) and lamellar (73–82) setae setiform, barbed, directed antero-medially. Interlamellar setae (139–155) setiform, with attenuate tips, slightly barbed. Bothridial setae (102–144) lanceolate, directed antero-laterad, with long, smooth stalks and very short, slightly barbed heads. Bothridia (bo) with large scales anteriorly ( Fig. 28 ). Exobothridial setae and their alveoli absent. Sejugal porose areas oval (20–24 × 6–8), transversely oriented.

Notogaster ( Figs 19–21 , 29 ). Anterior notogastral margin developed. Dorsophragmata slightly elongated longitudinally. Ten pairs of notogastral setae minute (4). Three pairs of porose areas with distinct borders: Aa oval (28–41 × 20–28), A1 (24–36) and A3 (20–28) rounded. Setae la inserted postero-laterally to Aa. Median pore absent in males and females. All lyrifissures distinct, im located between setae lm and lp. Opisthonotal gland openings located laterally and near to A1.

Gnathosoma ( Fig. 34 ). 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: 151–164 × 135–147. Subcapitular setae setiform, barbed, a (30–34) and h (24–30) longer and thicker than m (18–22). Two pairs of adoral setae (14–16) setiform, barbed. Palp length: 94–98. Palp formula is typical (0–2–1–3–9+1ω). Axillary saccules distinct, elongated. Chelicera length: 180–184. Cheliceral setae setiform, barbed, cha (61–65) longer than chb (41). Trägårdh’s organ elongate triangular, rounded distally.

Epimeral and lateral podosomal regions ( Figs 20 , 21 ). Anterior margin of epimere I smooth. Setal formula: 1– 0–1–3. Setae setiform, thin, slightly barbed, 3b (36–41) longer than others (20–28). Pedotecta II rectangular distally in ventral view. Discidia triangular. Circumpedal carinae (cp) directed to setae 3b, but not reaching them.

Anogenital region ( Fig. 20 ). Six pairs of genital (g 1, g 2, 14–16; g 3– g 6, 8–10), one pair of aggenital (10–14), two pairs of anal (10–14) and three pairs of adanal (10–14) setae setiform, thin, smooth. Genital plates with two genital setae on anterior edges. Aggenital setae inserted postero-laterally to genital aperture. Adanal lyrifissures 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 (20–24 × 6–8), transversely oriented.

Legs ( Figs 30, 31 ). 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 of medium size, slightly serrate on dorsal sides, median claw distinctly thicker than laterals. 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 anterior part of segments.

Material examined. Holotype (female) and 6 paratypes (4 females and 2 males): Binaloan municipality, Western Samar Province, Samar Island , Philippines, 6 July 2003, collected by William Sm . Gruezo, sample of litter from unknown forest type (not provided by collector). Other material: 2 females: 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: Barangay Burdeos, Polillo municipality, Polillo Island, Quezon Province , Philippines, 16 February 2003, collected by Orlando L. Eusebio, sample of bamboo litter near entrance to Mapanghe cave.

Type deposition. The holotype (alcohol) and two paratypes (alcohol) is deposited in the collection of the Senckenberg Institute , Görlitz, Germany; 4 paratypes (alcohol) and other material (3 specimens) (alcohol) are in the collection of the Tyumen State University Museum of Zoology , Tyumen, Russia .

Etymology. The specific name interlamellaris refers to the long interlamellar setae.

Remarks. Trichogalumna interlamellaris sp. nov. is morphologically most similar to T. seminuda Balogh, 1960 from the Ethiopian region and India in having long interlamellar setae and minute setae on notogaster, and the absence of median pore. However, the new species differs from the latter by the larger body size (581–830 × 448– 597 vs. 350 × 242), the presence of anterior notogastral margin (vs. absent) and small bothridial heads (vs. heads large), the absence of notogastral porose areas A2 (vs. present), and the localization of ad 3 laterally to iad (vs. posterior).

Figures

FIGURE 19. Trichogalumna interlamellaris sp. nov., adult: dorsal view. Scale bar 100 µm.

FIGURE 20. Trichogalumna interlamellaris sp. nov., adult: ventral view (subcapitulum and legs not shown). Scale bar 100 µm.

FIGURES 21 – 24. Trichogalumna interlamellaris sp. nov., adult: 21 — anterior part of body, lateral view (subcapitulum and legs not shown); 22 — rostrum, frontal view; 23 — posterior view; 24 — anterior part of subcapitulum, ventral view. Scale bars 100 µm (21 – 23), 50 µm (24).

FIGURES 25 – 31. Trichogalumna interlamellaris sp. nov., adult, microscope images: 25 — part of prodorsum, lateral view; 26, 27 — bothridial seta; 28 — bothridium; 29 — notogastral porose area Aa and seta la; 30 — anterior part of leg tibia IV, left, antiaxial view; 31 — leg claws on tarsus III (paraxial claw not shown), left, antiaxial view. Scale bars 20 µm.

FIGURES 34 – 37. Pergalumna (Pergalumna) crassipora Mahunka, 1995, adult: 34 — anterior part of body, lateral view (subcapitulum and legs not shown); 35 — rostrum, frontal view; 36 — posterior view; 37 — anterior part of subcapitulum, ventral view. Scale bars 100 µm (34 – 36), 20 µm (37).