Pergalumna asetosa, Ermilov, Sergey G., Shtanchaeva, Umukusum Ya., Kalúz, Stanislav & Subías, Luis S., 2013

Ermilov, Sergey G., Shtanchaeva, Umukusum Ya., Kalúz, Stanislav & Subías, Luis S., 2013, Three new species of the genus Pergalumna (Acari: Oribatida: Galumnidae) from India, Zootaxa 3682 (3), pp. 412-420 : 415-417

Pergalumna asetosa sp. nov.

( Figs 6–10 )

Diagnosis. Body size 813–846 × 664–697. Body surface indistinctly microfoveolate, posterior part of notogaster with a pair of longitudinal furrows, genital plates with longitudinal stria. Rostrum pointed. Interlamellar setae represented by alveoli. Sensilli long, clavate. Anterior notogastral margin present. Three pairs of oval porose areas developed. Median pore present. Postanal porose area present, elongate.

Description. Measurements. Body length 830 (holotype), 813–846 (mean 830; four paratypes); body width 697 (holotype), 664–697 (mean 680; four paratypes).

Integument. Body color brown. Body surface and pteromorphs densely and indistinctly microfoveolate (diameter of foveolae less than 1), it is visible only under high magnification. Pteromorphs with weakly developed wrinkles. Posterior part of notogaster with a pair of longitudinal furrows (f). Genital plates with longitudinal stria.

Prodorsum. Rostrum with small tooth. Rostral (69–77) and lamellar (86–98) setae setiform, thin, indistinctly barbed. Interlamellar setae represented by alveoli. Sensilli (110–123) with long stalk and small, slightly barbed head. Exobothridial setae not present. Lamellar and sublamellar lines well developed, parallel, but their basal parts are divergent. Insertions of lamellar setae located near to lamellar lines. Porose areas Ad present, elongate.

Notogaster. Anterior notogastral margin present. Dorsophragmata short. Notogastral setae represented by 10 pairs of alveoli. Three pairs of oval porose areas developed: Aa (49–57 × 28–36), A1 (41–53 × 28–36), A3 (41–49 × 28–36). Alveoli of setae la inserted posteriorly to Aa. Median pore represented by large foveum, which are located between furrows, antero-medially to A3 (similar in males and females). All lyrifissures and opisthonotal gland openings distinct, located typical for Pergalumna .

Gnathosoma . Morphology of subcapitulum, palps and chelicerae typical for Pergalumna (see Engelbrecht 1972; Ermilov & Anichkin 2011 a, 2011 b).

Epimeral and lateral podosomal regions. Apodemes 1, 2, sejugal and 3 well visible. Six pairs of setiform and smooth epimeral setae observed; setal formula: 1–0–2–3. Setae 3b (41–45) longer than 3c, 4c (20–24) and 1a, 4a, 4b (10–12). Pedotectae, discidia and circumpedal carinae located typical for the genus.

Anogenital region. Six pairs of genital, one pair of aggenital, two pairs of anal and three pairs of adanal setae similar in length (10–12), setiform, thin, smooth. Anterior part of genital plates with two (g 1, g 2) setae. Adanal setae ad 3 inserted laterally or antero-laterally to lyrifissures iad. Postanal porose area (Ap, 57–61 × 12–18) elongate.

Legs. Morphology of leg segments, setae and solenidia typical for Pergalumna (see Engelbrecht 1972; Ermilov & Anichkin 2011 a, 2011 b). Homology of setae and solenidia indicated in Table 1 .

Material examined. Holotype (female) and four paratypes (one male and three females): India, 28°19 ' 32 '' N 95°57 ' 31 '' E, Arunachal Pradesh, Hunli vicinity, 1300 m a.s.l., collected 0 1.06.2012 by L. Dembický & O. Šauša.

Type deposition. The holotype is deposited in the collection of the Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia; two paratypes are in the collection of the Siberian Zoological Museum, Novosibirsk, Russia; two paratypes are in the personal collection of the first author.

Etymology. The specific name “ asetosa ” refers to the absence of interlamellar setae.

Remarks. In having the combination of pointed rostrum, clavate sensilli, presence of anterior notogastral margin and three pairs of notogastral porose areas, striate genital plates, Pergalumna asetosa sp. nov. is most similar to P. rotunda Starý, 2005 from Japan and P. yurtaevi Ermilov & Anichkin, 2011 (a) from Vietnam, however it clearly differs from both by the absence of interlamellar setae (versus present in P. rotunda and P. yurtaevi ) and the presence of notogastral furrows (versus absent in P. ro t u n d a and P. yurtaevi ).

Also, Pergalumna asetosa sp. nov. is similar morphologically to P. operata Tseng, 1984 from Taiwan, however it clearly differs from the letter by the pointed rostrum (versus rounded in P. operata ), absence of interlamellar and notogastral setae (versus short setae present in P. o p e r a t a) and presence of three pairs of notogastral porose areas (versus four pairs present in P. operata ).

Figures

FIGURES 6 – 10. Pergalumna asetosa sp. nov., adult: 6 — dorsal view of body, 7 — ventral view of body (legs not shown), 8 — dorso-lateral view of prodorsum, 9 — medio-posterior view of notogaster, 10 — left pteromorpha. Scale bars (6, 7) 200 μm, (8 – 10) 100 μm.