Drymobatoides boronganensis, Ermilov & Corpuz-Raros, 2017

Ermilov, S. G. & Corpuz-Raros, L., 2017, New data on the Philippine oribatid mite fauna, with a contribution to knowledge of the genus Drymobatoides (Acari, Oribatida, Mochlozetidae), Acarologia 57 (2), pp. 295-308 : 300-304

Drymobatoides boronganensis n. sp.

( Figures 1-5 )

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Diagnosis — Body size: 664 – 747 × 514 – 564. Rostral and lamellar setae setiform, densely ciliate unilaterally. Interlamellar seta setiform, sparsely barbed. Bothridial seta setiform, with strong cilia unilaterally and several indistinct barbs on opposite side. About 45 pairs of notogastral porose areas. Epimeral setae setiform, slightly barbed, 1a, 2a, 3a and 4c shorter than other setae. Custodium present, curved laterally. Five pairs of genital setae. Marginoventral porose areas numerous. Leg femur II with rectangular emargination (em) ventrodistally. Measurements — Body length: 713 (holotype:

male), 664 – 747 (four paratypes: three females and one male); notogaster width: 547 (holotype), 514 – 564 (four paratypes).

Integument ( Fig. 3 ) — Body color light brown to dark brown. Surface microporose, lateral side of prodorsum densely microgranulate (diameter of granule up to 1) and tuberculate (diameter of tubercle up to 4).

Prodorsum ( Figs 1 , 3A ) — Rostrum rounded. Lamella (lam) longer than half of prodorsum, with minute, distally truncate cusp. Sublamella (slam) shorter than half of lamella, very thin. Sublamellar porose area oval (Al, 20 × 12 – 16). Tutorium (tu) well-developed. Rostral (ro, 61 – 65) and lamellar (le, 98 – 102) setae setiform, densely ciliate unilaterally. Interlamellar seta (in, 217 – 233) setiform, sparsely barbed, thicker than ro and le. Exobothridial seta (ex, 12 – 16) setiform, thin, indistinctly barbed. Bothridial seta (bs, 217 – 233) setiform, with strong cilia unilaterally and several indistinct barbs on opposite side. Dorsophragma (D) elongated longitudinally.

Notogaster ( Figs 1 , 3 ) — Pteromorph broadly rounded laterally. About 45 pairs of porose areas small, rounded (diameter of area up to 12). All lyrifissures (ia, im, ip, ips, ih) and opisthonotal gland opening (gla) clearly visible.

Gnathosoma ( Figs 2 , 4 ) — Subcapitulum longer than wide (159 – 168 × 143 – 147). Three pairs of subcapitular setae setiform, h (53 – 61) longer than m (45 – 53) and a (32 – 36), h and m distinctly barbed, a sparsely and indistinctly barbed. Two pairs of adoral setae (or 1, or 2, 16) thickened, heavily ciliate. Palp (90) with formula 0-2-1-3-9(+ω). Chelicera (176 – 184) with two setiform setae, cha (57 – 61) ciliate unilaterally, chb (28 – 32) heavily ciliate.

Epimeral and lateral podosomal regions ( Figs 1 , 3A ) — Epimeral setal formula: 3-1-3-3. All setae setiform, slightly barbed, 1a, 2a, 3a and 4c (49 – 53) shorter than other setae (53 – 57). Humeral porose

Ermilov S.G. and Corpuz-Raros L.

areas well separated, Am diffuse, elongate oval, Ah oval, with distinct border. Custodium (cus) present, minute, curved laterally. Discidium (dis) triangular, bears seta 4c. Circumpedal carina (cp) connected to cus.

Anogenital region ( Figs 2 , 3B ) — Five pairs of genital (g 1 - g 5, 16), one pair of aggenital (ag, 20), two pairs of anal (an 1, an 2, 20) and three pairs of adanal (ad 1 - ad 3, 20) setae setiform, thin, indistinctly barbed. Adanal lyrifissure (iad) well visible. Seta ad 1 postanal, ad 2 in lateral position, ad 3 inserted anterior or anterolateral to iad. Marginoventral porose areas ( Amar ) numerous, rounded, oval or oblong.

Legs ( Fig. 5 ) — Median claw sparsely serrate dorsally, laterals heavily serrate dorsally. Femur II with rectangular emargination (em) ventrodistally. Formulas of leg setation and solenidia: I (1-5-3-4- 20) [1-2-2], II (1-5-3-4-15) [1-1-2], III (2-3-1-3-15) [1- 1-0], IV (1-2-2-3-12) [0-1-0]; homology of setae and solenidia indicated in Table 1. Solenidion ω 1 on tarsus I, ω 1 and ω 2 on tarsus II and σ on genu III distally blunt, other solenidia longer, pointed.

Material examined — Holotype (male) and two paratypes (one female and one male): 5492 – Philippines, Samar Island, Eastern Samar Province, Sitio South Kamparema , Barangay Benowangan , Borongan Municipality , 17.VII.2003 (W.Sm. Gruèzo), from sample of secondary forest litter. Two paratypes (both females): 5639 – Luzon Island , Camarines Sur Province, Mt. Isarog , Barangay Panicuason, Naga City, 1.XI.2004 (D. General), from leaf litter in secondary forest.

Type deposition — The holotype (alcohol) is deposited in the collection of the Senckenberg Institute, Görlitz , Germany ; one paratype (alcohol) in the collection of the Museum of Natural History (University of the Philippines Los Baaeos), three paratypes (alcohol) are in the collection of the Tyumen State University Museum of Zoology , Tyumen, Russia .

Etymology — The specific name boronganensis refers to the Philippine Municipality, Borongan (Eastern Samar Province, Samar Island), where the holotype and some paratypes were collected.

Remarks — Drymobatoides boronganensis n. sp. is morphologically most similar to D. malabaricus ( Clement and Haq, 1982) from India in body size (about 700) and in having five pairs of genital setae. However, the new species differs from the latter by the rostral, lamellar and bothridial setae being ciliate unilaterally (vs. barbed completely), by the interlamellar seta being two times the length of the lamellar seta (vs. 1.4 times), and by the presence of a ventrodistal rectangular emargination on leg femur II (vs. emargination absent).

Figures

FIGURE 1: Drymobatoides boronganensis n. sp.: dorsal view (legs not illustrated). Scale bar 100 µm.

FIGURE 2: Drymobatoides boronganensis n. sp.: ventral view (legs not illustrated). Scale bar 100 µm.

FIGURE 3: Drymobatoides boronganensis n. sp.: A – lateral view (legs not illustrated), msig – muscle sigillae; B – posterior view. Scale bars 100 µm.

FIGURE 4: Drymobatoides boronganensis n. sp.: A – subcapitulum, ventral view; B – palptarsus, right, antiaxial view; C – medio-anterior part of chelicera, left, paraxial view. Scale bars (A, C) 50 µm; scale bar (B) 20 µm.

FIGURE 5: Drymobatoides boronganensis n. sp.: A – leg I, right, antiaxial view (solenidia σ and ’1 broken); B – leg I, without trochanter, right, antiaxial view; C – trochanter, femur and genu of leg III, left, antiaxial view; D – trochanter, femur and genu of leg IV, left, antiaxial view. Scale bar 50 µm.