Neoribates (Pseudoneoribates) negrosensis, Ermilov, Sergey G. & Corpuz-Raros, Leonila, 2015

Ermilov, Sergey G. & Corpuz-Raros, Leonila, 2015, A new subgenus and two new species of oribatid mites of the genus Neoribates (Acari, Oribatida, Parakalummidae) from the Philippines, Zootaxa 3956 (2), pp. 224-238 : 225-231

Neoribates (Pseudoneoribates) negrosensis sp. nov.

( Figs 1–17 )

Diagnosis. Body size: 713–830 × 514–564. Body surface punctate, rostrum and anterior ventral tectum foveolate, genital plates striate. Notogaster and anogenital region with thick, blocky cerotegument. Prodorsum with two strong longitudinal ridges. Rostral setae simple, distinctly barbed. Lamellar and interlamellar setae thickened, indistinctly barbed, the former inserted on lamellae. Bothridial setae with elongated, indistinctly developed head, barbed. Ten pairs of notogastral setae present, slightly barbed. Genital plates with 5 (exceptionally 4) setae. Adanal setae ad 3 in preanal position. Adanal lyrifissures in inverse apoanal position. Leg claws serrate.

Description. Measurements. Body length: 813 (holotype: male), 713–830 (5 paratypes: 2 females and 3 males); notogaster width: 531 (holotype), 514–564 (5 paratypes).

FIGURES 3–5. Neoribates (Pseudoneoribates) negrosensis sp. nov., adult: 3—dorso-frontal view of prodorsum; 4—lateral view of anterior part of body; 5—posterior view of notogaster with adanal setae ad 1. Scale bar 100 Μm.

Integument. Color dark brown. Body surface and pteromorphs punctate (visible under high magnification, ×1000). Rostrum and anterior ventral tectum with sparse round foveoles (up to 4). Notogaster and anogenital region with well developed cerotegument, represent by thick, blocky structure, with including round foveoles (up to 12). Prodorsum, and epimeral and lateral podosomal regions with thin, gel-like cerotegument.

Prodorsum. Anterior part considerably lower than medio-basal part; parts mediated by abrupt vertical slope. Medio-basal part with pair of strong, longitudinal, parallel band-like ridges (r). Rostrum protruding (visible in frontal view), narrowly rounded. Lamellae (lam) strong, slightly longer than half of prodorsum length (measured in lateral view). Prolamellae (plam) little thinner than lamellae. Sublamellae (slam) distinct, parallel to lamellae. Sublamellar porose areas (Al) oval (12–16 × 8–12). Tutoria (tu) long, ridge-like, pointed. Rostral setae (ro, 94–102) simple, distinctly barbed. Lamellar (le, 155–168) and interlamellar (in, 217–233) setae thickened, indistinctly and sparsely barbed, le inserted on lamellae. Exobothridial setae (ex, 16–20) thin, slightly barbed. Bothridial setae (ss, 123–139) thickened, with elongated, indistinctly developed head, slightly barbed.

Notogaster. Anterior notogastral margin convex. Dorsophragmata (D) long, longitudinally oriented. Ten pairs of notogastral setae (36–41) simple, slightly barbed. Four pairs of sacculi (Sa, S1–S3) visible, their channels slightly elongated. All lyrifissures (ia, im, ip, ih, ips) crack-like. Opisthonotal gland openings located posterolaterally to im, but visible only in dissected specimens.

Gnathosoma . Subcapitulum longer than wide (147–155 × 114–118). Genae with one diagonal ridge. Subcapitular setae (a, 16–20; m, 24–32; h, 32–41) simple, slightly barbed. Two pairs of adoral setae (or 1, or 2, 16– 20) setiform, heavily barbed. Palps (73–82) with setation 0–2–1–3–9(+ω). Chelicerae (168–176) with two setiform, barbed setae; cha (53–57) longer than chb (32). Trägårdh’s organ (Tg) distinct, tapered.

Epimeral and lateral podosomal regions. Apodemes (1, 2, sejugal, 3) well visible. One pair of longitudinal ridges (r) present, thin, indistinctly developed. Epimeral setae simple, slightly barbed; 3c (102–110) longer than 1b, 3b, 4c (53–65) and 1a, 1c, 2a, 3a, 4a, 4b (20–24). Pedotecta I (Pd I) and II (Pd II) broadly rounded and rectangular in ventral view, accordingly, and all scale-like in lateral view. Discidia (dis) triangular, with round tips. Circumpedal carinae (cp) strong.

Anogenital region. Genital plates with two to four longitudinal striae. Five pairs of genital (g 1, 28–32; g 2– g 5, 20–28), 1 pair of aggenital (ag, 16–24), 2 pairs of anal (an 1, an 2, 16) and 3 pairs of adanal (ad 1, ad 2, 32–41; ad 3, 20– 24) setae simple, slightly barbed. Four genital setae registered on left genital plate in one paratype. Adanal setae ad 3 in preanal position. Adanal lyrifissures iad in inverse apoanal position.

Legs. Leg tarsi with three claws (median clearly thicker than lateral), all distinctly serrate on dorsal sides. Formulae 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 (1–2–2–4–12) [0–0–0]; homology of setae and solenidia indicated in Table 1 .

Roman letters refer to normal setae, Greek letters to solenidia (ɛ to famulus). Single prime (') marks setae on anterior and double prime (") setae on posterior side of the given leg segment. Parentheses refer to a pair of setae.

Material examined. Holotype (male) and two paratypes (1 female and 1 male): Philippines, Negros Island, Mahilog, Sibulan, Negros Oriental, in litter from forest, 3.IV.1981, collected by S.G. Reyes. Three paratypes (1 female and 2 males): Philippines, Luzon Island, Siniloan, Laguna, in undecomposed leaf litter from climax dipterocarp forest 28.X.1974, collected by R. Aspiras.

Type deposition. The holotype is deposited in the collection of the Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia; 3 paratypes are deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia; 2 paratypes are deposited in the Museum of Natural History, University of the Philippines Los Baños, College, Laguna, Philippines.

Etymology. The specific name “ negrosensis ” refers to the Philippine island of origin, Negros.

Figures

FIGURE 1. Neoribates (Pseudoneoribates) negrosensis sp. nov., adult: dorsal view (lateral parts of pteromorphs not illustrated). Scale bar 100 Μm.

FIGURE 2. Neoribates (Pseudoneoribates) negrosensis sp. nov., adult: ventral view (lateral parts of pteromorphs and legs not illustrated). Scale bar 100 Μm.

FIGURES 6 – 10. Neoribates (Pseudoneoribates) negrosensis sp. nov., adult: 6 — pteromorh, notogastral setae c and la, and saccule Sa; 7 — medio-anterior part of body, ventro-lateral view; 8 — left half of subcapitulum, ventral view; 9 — palp; 10 — anterior part of chelicera, paraxial view. Scale bars (6, 7) 100 Μm, (8 – 10) 20 Μm.

FIGURES 11 – 17. Neoribates (Pseudoneoribates) negrosensis sp. nov., adult: 11 — right genital plate; 12 — left genital plate; 13 — left tarsus and anterior part of tibia of leg I, paraxial view; 14 — right tarsus of leg IV, antiaxial view; 15 — right genu and femur of leg IV, antiaxial view; 16 — right genu and femur of leg III, antiaxial view; 17 — right claws and setae p on leg II, antiaxial view. Scale bars (11, 12) 20 Μm, (13 – 17) 50 Μm.

Tables

TABLE 1. Leg setation and solenidia of adult Neoribates (Pseudoneoribates) negrosensis sp. nov. (same data for N. (P.) kontschani sp. nov.)

Leg	Trochanter	Femur	Genu	Tibia	Tarsus
I	v'	d, (l), bv'', v''	(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'', v''	(l), v', σ	(l), (v), φ	(ft), (tc), (it), (p), (u), (a), s, (pv), ω1, ω2
III	l', v'	d, l', ev'	l', σ	l', (v), φ	(ft), (tc), (it), (p), (u), (a), s, (pv)
IV	v'	d, ev'	d, l'	d, l', (v)	ft'', (tc), (p), (u), (a), s, (pv)