Pergalumna mahunkai, 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 : 417-419

Pergalumna mahunkai sp. nov.

( Figs 11–15 )

Diagnosis. Body size 498–531 × 381–398. Body surface microgranulate, genital plates striate. Rostrum pointed. Prodorsal setae of medium size, slightly barbed. Sensilli setiform, ciliate. Distinct anterior notogastral margin absent (it is unclearly visible under high magnification). Three pairs of oval porose areas developed. Median pore present. Postanal porose area absent.

Description. Measurements. Body length 498 (holotype), 498–531 (mean 525; three paratypes); body width 381 (holotype), 381–398 (mean 392; three paratypes).

Integument. Body color brown. Body surface densely microgranulate (diameter of granules less than 1). Pteromorphs with distinct wrinkles. Genital plates with two or three long, longitudinal striae in median part.

Prodorsum. Rostrum with strong tooth. Rostral, lamellar and interlamellar setae similar in length (45–49), setiform, slightly barbed. Sensilli (98–102) setiform, with short cilia. Exobothridial setae not present. Lamellar and sublamellar lines well developed, parallel. Insertions of lamellar setae removed from lamellar lines. Porose areas Ad not evident.

Notogaster. Distinct anterior notogastral margin absent, but it is unclearly visible under high magnification. Dorsophragmata long. Notogastral setae represented by 10 pairs of alveoli. Three pairs of oval porose areas developed: Aa (24–28 × 10–20), A1 (20–24 × 12–16), A3 (12–16 × 10–14). Alveoli of setae la inserted laterally to Aa. Median pore represented by small foveum, located between porose areas A1 (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 short (8), setiform and smooth epimeral setae observed; setal formula: 1–0–2–3. Setae 3c and 4c visible in dissected specimens. Pedotectae, discidia and circumpedal carinae (cp) located typical for the genus.

Anogenital region. Six pairs of genital (g 1, g 2, 12–16; g 3– g 6, 8), one pair of aggenital (8), two pairs of anal (8) and three pairs of adanal (ad 1, ad 2, 12–16; ad 3, 8) setae setiform, thin, smooth. Anterior part of genital plates with two (g 1, g 2) setae. Adanal setae ad 3 inserted postero-laterally to lyrifissures iad. Postanal porose area absent.

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 (male) and eight paratypes (male and two females; sex not studied in five specimens): India, Tripura, Maharanipur, leaf debris underneath shrubs, collected by 0 5.04.1976, S. Sarkar.

Type deposition. The holotype is deposited in the collection of the Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia; one paratype is in the collection of the Siberian Zoological Museum, Novosibirsk, Russia; two paratypes are in the personal collection of the first author; five additional paratypes (not studied in detail) are in the collection of Department of Zoology, Faculty of Biology, Complutense University, Madrid, Spain.

Etymology. The species is named after the late Prof. Dr. Sándor Mahunka, the distinguished acarologist from Budapest, Hungary.

Remarks. In having the combination of microgranulate body surface, pointed rostrum, setiform sensilli, medium length of rostral, lamellar and interlamellar setae, presence of three pairs of notogastral porose areas, striate genital plates, Pergalumna mahunkai sp. nov. is most similar to Pergalumna margaritata Mahunka, 1989 from Vietnam and Pergalumna pseudomargaritata Mahunka, 1994 from Thailand, however it clearly differs from both species by absence of distinct anterior notogastral margin (versus presence of specific-tuberculate anterior notogastral margin in P. margaritata and P. pseudomargaritata ), larger body size (498–531 × 381–398 versus 451– 490 × 326–366 in P. margaritata , 402–447 × 281–315 in P. pseudomargaritata ) and more thin and slightly barbed rostral, lamellar and interlamellar setae (versus thicker and well barbed in P. m a rg a r it at a and P. pseudomargaritata ).

Also, Pergalumna mahunkai sp. nov. is similar morphologically to P. foveolata Hammer,1973 from Polynesia, India and Brazil (see also Bayartogtokh & Chattarjee 2010; also after unpublished data of the first author) and P. jongkyui Choi, 1986 from Korea, however it clearly differs from both by following characters: pointed rostrum (versus rounded in P. foveolata and P. jongkyui ), absence of developed anterior margin of notogaster (versus present in P. foveolata ), genital plates with longitudinal striae (versus absent in P. foveolata ), small notogastral porose areas (versus large in P. jongkyui ) and the presence of median pore (absent in in P. jongkyui ).

Figures

FIGURES 11 – 15. Pergalumna mahunkai sp. nov., adult: 11 — dorsal view of body (right pteromorph not shown), 12 — ventral view of body (anal plates and legs not shown), 13 — dorso-lateral view of prodorsum, 14 — posterior view of notogaster, 15 — right pteromorpha. Scale bar 100 μm.