Pergalumna (Pergalumna) parapassimpunctata, Ermilov, Sergey G. & Friedrich, Stefan, 2016

Ermilov, Sergey G. & Friedrich, Stefan, 2016, New Pergalumna (Acari, Oribatida, Galumnidae) from Peru, Zootaxa 4088 (4), pp. 571-582 : 572-575

Pergalumna (Pergalumna) parapassimpunctata sp. nov.

( Figs 1–10 )

Diagnosis. Body size: 348–415 × 249–315. Body surface foveolate. Rostral and lamellar setae of medium size, barbed. Interlamellar setae minute. Bothridial setae very long, setiform, ciliate unilaterally. Anterior notogastral margin not developed. Four pairs of notogastral porose areas rounded, Aa divided into two areas, A3 absent. Median pore and postanal porose area absent. Anal and ano-adanal setae short.

Description. Measurements. Small species. Body length: 365 (holotype: male), 348–415 (9 paratypes: 3 females and 6 males); notogaster width: 249 (holotype), 249–315 (9 paratypes). Without sexual dimorphism.

Integument. Body color light brownish to brown, covered by dense microgranular cerotegument (diameter of granules less than 1). Surface of dorsal and ventral sides, pteromorphs, subcapitular mentum and legs foveolate; foveoles (their diameter up to 4) distinctly separated from each other, well visible, except on prodorsum and genital plates (visible only in dissected specimens). Prodorsum with one transverse and two longitudinal striate bands: transverse band located anterior to interlamellar setae; longitudinal bands parallel, each located from the transverse band to rostrum (medially to lamellar setae). Ventral body sides with two lateral, transversal striate bands between genital and anal plates, and one arcuate striate band posteriorly to anal plates, extending marginally into the anoadanal region.

Prodorsum. Rostrum slightly protruding, rounded. Lamellar (L) and sublamellar (S) lines distinct, thin, parallel, curving backwards. Rostral (ro, 28–36) and lamellar (le, 49–53) setae setiform, barbed unilaterally, directed antero-medially; ro thicker than le. Interlamellar setae (in, 4) minute, thin, smooth. Bothridial setae (bs, 143–155) very long (longer than hinges between notogaster and pteromorphs), setiform, thickened, ciliate unilaterally, directed postero-laterad. Exobothridial setae and their alveoli absent. Porose areas Ad oval, transversally oriented (12–20 × 4–6).

Notogaster. Anterior notogastral margin not developed. Dorsophragmata (D) elongated longitudinally. Notogastral setae represented by 10 pairs of alveoli. Four pairs (Aal, Aam, A1, A2) of porose areas rounded, similar in diameter (10–12), with clear borders. Areas A3 always absent. Areas Aa divided into two part, but Aal absent in two paratypes. Setal alveoli la located laterally to Aal, lm located medially to Aam. Median pore absent in males and females. All lyrifissures (ia, im, ip, ih, ips) distinct, im and opisthonotal gland openings (gla) located laterally to A1 and distanced from them.

Gnathosoma . Morphology of subcapitulum, palps and chelicerae typical for Pergalumna (e.g. Engelbrecht 1972; Ermilov & Anichkin 2011). Subcapitulum size: 98–114 × 90–102. Subcapitular setae setiform, indistinctly barbed, a (18–20) longer than m (12–14) and h (8); a thickest, h thinnest. Two pairs of adoral setae (or 1, or 2, 12) setiform, barbed. Palp length: 73–77. Axillary sacculi distinct, slightly elongated. Chelicera length: 135–143. Cheliceral setae setiform, barbed, cha (41) longer than chb (24).

Epimeral and lateral podosomal regions. Anterior tectum of epimere I smooth. Setal formula: 1–0–1–3. Setae thin, smooth, 3b and 4c (16–18) longer than 1a, 4a and 4b (6–8). Pedotecta II trapezoid, rounded distally in ventral view. Discidia sharply triangular. Circumpedal carinae (cp) directed to insertions of 3b.

Anogenital region. Six pairs of genital (g 1, g 2, 8–10; g 3– g 6, 6–8), one pair of aggenital (ag, 6–8), two pairs of anal (an 1, an 2, 6–8) and three pairs of adanal (ad 1– ad 3, 6–8) setae thin, smooth. Genital plates with two genital setae on anterior edge. Adanal lyrifissures (iad) located close and parallel to anal plates. Distance ad 1– ad 2 slightly shorter than ad 2– ad 3. Setae ad 3 inserted laterally to iad. Postanal porose area absent. Ovipositor size: 155 × 28; blades (65) shorter than length of distal section (beyond middle fold; 90). Each of three blades with four straight, smooth setae, ψ1 ≈ τ1 (36–41) longer than ψ2 ≈ τ a ≈ τ b ≈ τ c (16). Six coronal setae (4) spiniform.

Legs. Morphology of leg segments, setae and solenidia typical for Pergalumna (e.g. Engelbrecht 1972; Ermilov & Anichkin 2011). Median claw thicker than laterals, all serrate on dorsal side. Formulas 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 . Solenidion φ of tibiae IV inserted dorsally at about 1/3 length of segment.

Material examined. Holotype (male) and 9 paratypes (3 females and 6 males): see “Material and methods” section.

Type deposition. The holotype is deposited in the collection of the Museo de Historia Natural, Universidad Nacional Mayor de San Marcos, Lima, Peru; two paratypes are deposited in the collection of the Bavarian State Collection of Zoology, Munich, Germany; two paratypes are deposited in the collection of the Senckenberg Institution Frankfurt, Germany; five paratypes are deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia.

Leg Tr Fe Ge Ti Ta

Note: Roman letters refer to normal setae, Greek letters to solenidia (except ɛ = famulus). Single prime (') marks setae on the anterior and double prime (") setae on the posterior side of a given leg segment. Parentheses refer to a pair of setae. Tr—trochanter, Fe—femur, Ge—genu, Ti—Tibia, Ta—tarsus.

Etymology. The specific name parapassimpunctata refers to the similarity between the new species and the species Pergalumna (Pergalumna) passimpunctata Balogh & Mahunka, 1969 .

Remarks. The new species is morphologically most similar to Pergalumna (Pergalumna) passimpunctata Balogh & Mahunka, 1969 from Brazil (see Balogh & Mahunka 1969; Ermilov & Niedbała 2013) in having microgranular cerotegument, striate bands on prodorsum and ventral side, long, setiform and ciliate bothridial setae and the absence of anterior margin of notogaster, median pore and postanal porose area, however, it differs from the latter by the presence of foveolate body surface (vs. not foveolate), two pairs of porose areas Aa in typical case (vs. one pair) and minute interlamellar setae (vs. absent), and the absence of porose areas A3 (vs. well developed).

Figures

FIGURES 1 – 5. Pergalumna (Pergalumna) parapassimpunctata sp. nov., adult: 1 — dorsal view; 2 — ventral view (legs not shown); 3 — part of notogaster (on right side) with porose area Aam and setal alveoli la and lm; 4 — subcapitulum, ventral view; 5 — part of epimeral and podosomal regions (on right side; legs not shown) with sejugal apodeme, apodeme III, pedotectum II, discidium, setae 3 b, 4 a and 4 c and anterior part of circumpedal carina. Scale bars 100 µm (1, 2), 20 µm (3 – 5).

FIGURES 6 – 10. Pergalumna (Pergalumna) parapassimpunctata sp. nov., adult: 6 — anterior part of body, lateral view (subcapitulum and legs not shown); 7 — posterior view; 8 — right genital plate and epimeral seta 4 b; 9 — right anal plate, adanal lyrifissure and adanal setae; 10 — tibia IV, left, antiaxial view. Scale bars 100 µm (6, 7), 20 µm (8 – 10).

Tables

TABLE 1. Leg setation and solenidia of adult Pergalumna (Pergalumna) arapassimpunctata sp. nov. (same data for P. (P.) krisperi sp. nov. and P. (P.) lenticulata sp. nov.)

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)