Galumna (Cosmogalumna) vladopesici, Ermilov, Sergey G. & Corpuz-Raros, Leonila, 2015

Ermilov, Sergey G. & Corpuz-Raros, Leonila, 2015, New species of oribatid mites with auriculate pteromorphs (Acari, Oribatida, Galumnidae) from the Philippines, Zootaxa 3905 (4), pp. 511-528 : 512-517

Description of Galumna (Cosmogalumna) vladopesici sp. n.

( Figs 1–9 )

Diagnosis. Body size: 278–307 × 209–246. Surface of prodorsum, pteromorphs and epimeral region with longitudinal stria; dorsal part of notogaster, pteromorphs and anogenital region with reticulate pattern; genital and anal plates with microtubercles and short ribs. Rostral and lamellar setae simple, smooth; interlamellar setae each represented by alveolus. Bothridial setae clavate, with head rounded distally, smooth. Four pairs of porose areas present: Aa largest, oval, A1 and A2 rounded, A3 elongate oval. Median pore absent. Postanal porose area (Ap) transversely oval.

Description. Measurements. Body length: 307 (holotype: female), 278–303 (five paratypes: three females, two males); notogaster width: 229 (holotype), 209–246 (five paratypes).

Integument ( Figs 1–4 , 7–9 ). Body color brown. Body surface, pteromorphs, genital and anal plates, subcapitular mentum and legs densely microfoveolate (diameter of foveoles less than 1). Surface of prodorsum, pteromorphs and epimeral region with longitudinal striae. Dorsal part of notogaster (length of cells up to 36), pteromorphs (length of cells up to 16) and anogenital region except lateral regions to anal aperture (length of cells up to 28) with reticulate pattern. Genital and anal plates with microtubercles (diameter less than 1) and short ribs (length up to 4).

Prodorsum ( Figs 1 , 3 , 5, 6 ). Rostrum rounded. Rostral (ro, 12–16) and lamellar (le, 8–12) setae simple, thin, smooth. Interlamellar setae (in) absent, each represented by alveolus. Bothridial setae (ss, 53–57) clavate, with long stalk and shorter head; bothridial head rounded distally, smooth. Exobothridial setae and their alveoli absent. Porose areas Ad elongate oval, transversely oriented (10–12 × 4–6). Lamellar (L) and sublamellar (S) lines distinct, parallel, curving backwards. Lamellar lines bifurcate in basal part into lateral (Ll) and medial (Lm) lines; insertions of lamellar setae located between them.

Notogaster ( Figs 1 , 3, 4 , 7, 8 ). Anterior notogastral margin developed. Dorsophragmata (D) long, longitudinally elongated. Notogastral setae represented by 10 pairs of alveoli. Four pairs of porose areas with distinct borders: Aa large, oval (20–24 × 16–20); A1 and A2 small, rounded (diameter of both 8–14), located close to each other; A3 elongate oval (16–20 × 10–12). Alveoli la inserted posteriorly to Aa. Lyrifissures im located between Aa and A1. Opisthonotal gland openings (gla) located laterally to A2. Median pore absent.

Gnathosoma . Morphology of subcapitulum, palps and chelicerae generally typical for species of the subgenus Galumna (Cosmogalumna) and other Galumnidae (for example, Engelbrecht 1969, 1972; Ermilov et al. 2011; Ermilov & Anichkin 2013). Subcapitulum longer than wide (77–86 × 61–69). Subcapitular setae simple, slightly barbed: a (20–24) longer than m and h (both 6–8); a thickest, m thinnest. Two pairs of adoral setae (12) setiform, barbed. Palps (57–61) with setation 0–2–1–3–9(+ω). Solenidion straight, thickened, blunt-ended, attached to eupathidium. Chelicerae (86–94) with two setiform, barbed setae; cha (32–36) longer than chb (20). Trägårdh’s organ distinct, tapered.

Epimeral and lateral podosomal regions ( Fig. 2 ). Apodemes (1, 2, sejugal, 3) well visible. Three pairs of epimeral setae (1a, 3b, 4a) present; all short, similar in length (4), thin, smooth. Pedotecta II (Pd II) rectangular, rounded or weakly truncate anteriorly in ventral view. Discidia (dis) triangular. Circumpedal carinae (cp) directed to the insertions of 3b.

Anogenital region ( Figs 2 , 4 , 9 ). Six pairs of genital setae (g 1, 8–10, g 2– g 3, 6–8, g 4– g 6, 2–4), one pair of aggenital (ag, 4), two pairs of anal (an 1, an 2, 4) and three pairs of adanal (ad 1– ad 3, 4) setae minute, thin, smooth. Anterior edge of genital plates with three setae. Adanal setae ad 3 inserted laterally to adanal lyrifissures iad. Postanal porose area (Ap) transversely oval (10–12 × 4–6).

Legs. Morphology of leg segments, setae and solenidia generally typical for species of the subgenus Galumna (Cosmogalumna) and other Galumnidae (for example, Engelbrecht 1969, 1972; Ermilov et al. 2011; Ermilov & Anichkin 2013). Formulae 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]; homologies of setae and solenidia indicated in Table 1 .

Roman letters refer to normal setae (ɛ to famulus), Greek letters to solenidia. 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 (female) and five paratypes (three females, two males): Philippines, Luzon Island, Mount Makiling, on north trail to peak, 700-900 m a.s.l., in mosses, 4.V.1975, collected by R.S. Raros.

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

Etymology. The specific name is dedicated to our colleague, acarologist, Prof. Dr. Vladimir Pešić (University of Montenegro, Podgorica, Montenegro) for his extensive contributions to our knowledge of water mites of the World.

Remarks. In having small body size, stria on prodorsum and pteromorphs, and reticulate pattern on notogaster and anogenital region, Galumna (Cosmogalumna) vladopesici sp. nov. is most similar to G. (C.) dongnaiensis Ermilov & Anichkin, 2013 from Vietnam. However, it clearly differs from the latter by the presence of reticulate pattern on pteromorphs (versus absent in G. (C.) dongnaiensis ), four pairs of notogastral porose areas (versus three pairs, A2 absent, in G. (C.) dongnaiensis ) and short ribs and tubercles on genital and anal plates (versus striate in G. (C.) dongnaiensis ), and the notogastral porose area Aa clearly larger than A1 (versus similar in G. (C.) dongnaiensis ).

Figures

FIGURE 1. Galumna (Cosmogalumna) vladopesici sp. nov., adult: dorsal view. Scale bar 100 Μm.

FIGURE 2. Galumna (Cosmogalumna) vladopesici sp. nov., adult: ventral view. Scale bar 100 Μm.

FIGURES 3 – 4. Galumna (Cosmogalumna) vladopesici sp. nov., adult: 3 — lateral view of prodorsum and anterior part of notogaster and pteromorph; 4 — posterior view. Scale bar 50 Μm.

FIGURES 5 – 9. Galumna (Cosmogalumna) vladopesici sp. nov., adult, brightfield micrographs: 5 — lamellar and sublamellar lines and lamellar seta; 6 — bothridial seta; 7 — reticulate pattern on notogaster; 8 — reticulate pattern on pteromorph; 9 — reticulate pattern in anogenital region. Scale bar 20 Μm.

Tables

TABLE 1. Leg setation and solenidia of adult Galumna (Cosmogalumna) vladopesici sp. nov. (same data for Carinogalumna philippinensis sp. nov. and Setogalumna luzonica sp. nov.)

Leg	Trochanter	Femur	Genu	Tibia	Tarsus
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)