Pergalumna (Pergalumna) janosbaloghi, Ermilov & Starý, 2020

Ermilov, Sergey G. & Starý, Josef, 2020, New and interesting species of the generaGalumna andPergalumna (Acari, Oribatida, Galumnidae) from the Montagne d’Ambre National Park, Madagascar, Acarologia 60 (1), pp. 64-74 : 64-74

Pergalumna (Pergalumna) janosbaloghi n. sp.

Zoobank: 668307A5-D67E-4A81-A600-057C5ABE7542

( Figures 4–6 )

Diagnosis — Body size 290–298 × 232–249. Rostrum broadly rounded. Rostral and lamellar setae of medium size, setiform, slightly barbed. Interlamellar setae minute. Bothridial setae long, setiform, shortly ciliate. Dorsosejugal porose areas present. Dorsosejugal suture absent. Three pairs of porose areas, Aa elongate, distinctly or slightly triangular, transversely oriented, A1 and A3 rounded. Median pore absent. Epimeral setal formula 1-0-1-3. Epimeral and anogenital setae short, setiform, smooth. Circumpedal carinae long. Postanal porose area absent. Solenidion on tibiae IV inserted in anterior part of the segment.

Description — Measurements – Small species. Body length 298 (holotype, female), 290– 298 (nine paratypes, all females); notogaster width 240 (holotype), 232–249 (nine paratypes).

Integument – Body color light brown to brown. Body surface densely microgranulate, granules (up to 1) well visible even at low magnification × 400). Antiaxial sides of all leg femora and trochanters III, IV with rounded and elongated tubercles.

Prodorsum ( Figs 4a , 5a ) – Rostrum broadly rounded. Lamellar and sublamellar lines thin, parallel, curving backwards. Lateral structures N and ridges E and T slightly developed. Rostral (20–22) and lamellar (30–32) setae setiform, slightly barbed. Interlamellar setae very short (2–4), setiform, thin, smooth. Bothridial setae (73–86) setiform, shortly ciliate. Exobothridial setae represented by alveoli. Dorsosejugal porose areas (10–12 × 4) elongate oval, transversely oriented, located posterolateral to in. Dorsophragmata distinctly elongated longitudinally.

Notogaster ( Figs 4a , 5a, 5b ) – Dorsosejugal suture absent. With 10 pairs of setal alveoli three pairs of porose areas having indistinct borders, Aa (36–49 × 8–12) elongate, distinctly or slightly triangular, transversely oriented, A1 (16–24) and A3 (8–12) rounded. Porose areas Aa located close to pteromorphal hinges, anteriorly to la. Median pore absent in females (males not found). Opisthonotal gland openings and all lyrifissures distinct (except ips not observed), gla located lateral to A1 and slightly removed from them, im anterolateral to A1 and removed from them, ip lateral to p 1, ih anterior to p 3.

Gnathosoma ( Fig. 5c ) – Similar to G. sandormahunkai n. sp. Subcapitulum size 82–86 × 69–73. Subcapitular setae (a, 12; m, 12; h, 8) setiform, roughened; a thickest, h thinnest. Adoral setae (10) setiform, barbed. Length of palps 57–63. Postpalpal setae (2) spiniform, smooth. Length of chelicerae 94–98. Cheliceral setae (cha, 16; chb, 10) setiform, barbed. Trägårdh’s organ of chelicerae long, elongate triangular.

Epimeral and lateral podosomal regions ( Figs 4b , 5a ) – Anterior margin of epimere I smooth. Epimeral setal formula 1-0-1-3. Epimeral setae setiform, thin, smooth, 1b, 3b and 4c (6–8) longer than 4a and 4b (2–4). Pedotecta I broadly rounded, pedotecta II quadringular in ventral view. Discidia triangular. Circumpedal carinae long, thin, directed to epimere I.

Anogenital region ( Figs 4b , 5b ) — Six pairs of genital setae g 1,(g 2, 6–8; g 3 – g 6, 2–4), one pair of aggenital (2–4), two pairs of anal (2–4) and three pairs of adanal (2–4) setae setiform, thin, smooth. Anterior edge of genital plates with two setae. Aggenital setae located between genital and anal apertures, nearer to genital aperture. Adanal lyrifissures located close and parallel to anal plates. Adanal setae ad 1 and ad 2 posterior, ad 3 lateral to anal aperture. Distance ad 1 – ad 2 slightly shorter than ad 2 – ad 3. Postanal porose area absent.

Legs ( Figs 6a, 6b ) — Median claw distinctly thicker than lateral claws, all slightly barbed on dorsal side. Porose area on all femora and on trochanters III, IV well visible. 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]; homology of setae and solenidia indicated in Table 1 . Famulus on tarsi I inserted between solenidia ω 1 and ω 2. Solenidion on tibiae IV inserted in anterior part of the segment.

Material examined — Holotype (female) and nine paratypes (nine females): North Madagascar, Montagne d’Ambre National Park , circuit Ampijoroana , evergreen rain forest, 12°31’28”S, 49°09’52”E, 950 m a.s.l., sifting of leaf litter sample under big unidentified tree, Winkler apparatus extraction, 13.I.2014 (R. Ravebolun and L. Rabotenoson) .

Type deposition — The holotype and two paratypes are deposited in the collection of the Senckenberg Institute, Görlitz, Germany . Seven paratypes are deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia . All specimens are preserved in ethanol with drop of glycerol.

Etymology — The new species is named after late Prof. Dr. J. Balogh, the Hungarian acarologist, for his extensive contributions to our knowledge of oribatid mites.

Remarks — In the presence of short interlamellar setae, setiform bothridial setae, interrupted medially dorsosejugal suture, and three pairs of notogastral porose areas with Aa elongated transversely oriented, Pergalumna janosbaloghi n. sp. is morphologically most similar to Pergalumna aegra Pérez-Íñigo and Baggio, 1986 from Brazil and India, but differs from the letter by the smaller body size (290–298 × 232–249 versus 468 × 408) and the presence of long lamellar setae (versus short) and triangular porose areas Aa (versus elongate oval).

Figures

Figure 4 Pergalumna janosbaloghin. sp., adult: a – dorsal view; b – ventral view (gnathosoma and legs omitted). Scale bar 50 μm.

Figure 5 Pergalumna janosbaloghin. sp., adult: a – anterior part of body, lateral view (gnathosoma and legs omitted); b – posterior part of body, lateral view; c – subcapitulum, ventral view. Scale bar 50 μm (a, b), scale bar 20 μm (c).

Figure 6 Pergalumna janosbaloghin. sp., adult: a – leg I, without trochanter, right, antiaxial view; b – leg IV, left, antiaxial view. Scale bar 20 μm.

Tables

Table 1 Leg setation and solenidia of adultGalumna sandormahunkai n. sp. andPergalumna janosbaloghin. sp.

Leg	Tr	Fe	Ge		Ti	Ta
I	v’	d, (l), bv”	(l), v’,	σ	(l), (v), φ 1, φ 2	(ft), (tc), (it), (p), (u), (a), s, (pv),	v’, (pl), l”, ɛ,	ω 1, ω 2
II	v’	d, (l), bv”	(l), v’,	σ	(l), (v), φ	(ft), (tc), (it), (p), (u), (a), s, (pv),	ω 1, ω 2
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)

Note: Roman letters refer to normal setae, Greek letters to solenidia (except ɛ = 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.