Pergalumna paralongisetosa, Ermilov, Sergey G. & Kalúz, Stanislav, 2012

Ermilov, Sergey G. & Kalúz, Stanislav, 2012, Four new species of the superfamily Galumnoidea (Acari: Oribatida) from Ecuador, Zootaxa 3481, pp. 27-38 : 30-32

Pergalumna paralongisetosa sp. nov.

( Figs 8–12 )

Diagnosis. Very large species, body size 1062–1261 × 713–863. Surface of prodorsum tuberculate. Prodorsal setae and sensilli setiform, barbed. Sensilli shorter than interlamellar setae. Anterior notogastral margin absent. Three pairs of oval porose areas present. Median pore absent. Adanal setae ad 1 and ad 2 long. Postanal porose area absent.

Description. Measurements. Very large species. Body length 1261 (holotype), 1062–1261 (mean 1169; four paratypes); body width 863 (holotype), 713–863 (mean 817; four paratypes).

Integument ( Fig. 8 ). Body color brown. Surface of body smooth. Only surface of prodorsum tuberculate (diameter of tubercles up to 1) and postanal region weakly striate.

Prodorsum ( Figs 8 , 10, 12 ). Rostrum rounded in dorsal view. Rostral (82–102), lamellar (155–188) and interlamellar (209–250) setae and sensilli (123–135) setiform, barbed. A pair of long and narrow porose areas Ad present latero-posterior to interlamellar setae. Lamellar and sublamellar lines well developed, parallel. Insertions of lamellar setae near to lamellar lines. Exobothridial setae not present.

Notogaster ( Figs. 8 , 12 ). Anterior notogastral margin absent. Pteromorphs with wrinkles, and short and long pigmented bands. Notogastral setae represented by 11 pairs of alveoli (a pair of additional notogastral alveoli lx present posterior to porose areas Aa). Three pairs of oval porose areas developed: Aa 57–69 × 32–36, A1 57–69 × 24–32, A3 49–57 × 20–28. Median pore absent. Lyrifissures im located anteriorly to notogastral alveoli h 3.

Gnathosoma . Morphology typical for Pergalumna (see Engelbrecht 1972; Ermilov & Anichkin 2011a, 2011b).

Epimeral region ( Fig. 9 ). Apodemes 1, 2, sejugal and 3 well visible. Five pairs of setiform, slightly barbed epimeral setae visible. Also alveoli of setae 1c present. Epimeral setal formula: 3–0–1–2. Setae 1b (77–82) and 3c (49–53) longer than others (28–41).

Anogenital region ( Fig. 9 ). Six pairs of genital (45–61), one pair of aggenital (45–61), three pairs of adanal and two pairs of anal (49–73) setae setiform, slightly barbed. Adanal setae ad 1 and ad 2 long (106–131), straight, longer than ad 3 (57–82). Anterior part of genital plates with two genital setae (g 1, g 2). Lyrifissures iad paranal or inverse apoanal, located anteriorly to ad 3. Postanal porose area absent.

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

Material examined. The holotype (female) and four paratypes (three females and one male) have the following collection data: Ecuador, 0°25'8.04''S, 79°0'14.04''W, Reserva de Bosque Integral Otonga, near San Francisco de las Pampas, 2000-2200 m a.s.l., sifted litter, 7.11.1996, collected by Giovanni Onore.

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 deposited in the collection of Siberian Zoological Museum, Novosibirsk, Russia; two paratypes are in the personal collection of the first author.

Etymology. The prefix para is Latin meaning “near” and refers the similarity between the new species and the species Pergalumna longisetosa Balogh, 1960 .

Remarks. In having the combination of setiform sensilli, long prodorsal setae, absence of anterior notogastral margin, three pairs of notogastral porose areas and long adanal setae ad 1 and ad 2, Pergalumna paralongisetosa sp. nov. is very similar to Pergalumna longisetosa Balogh, 1960 from Central Africa (see Balogh 1960). However it clearly differs from the latter species by the larger body size (1062–1261 × 713–863 in Pergalumna paralongisetosa sp. nov. versus 522–542 × 410–414 in Pergalumna longisetosa ), sensilli shorter than lamellar and interlamellar setae (versus longer in Pergalumna longisetosa ), absence of medial pore (present in Pergalumna longisetosa ), epimeral setae 1b and 3c considerable longer than others (epimeral setae little differ in length in Pergalumna longisetosa ).

Figures

FIGURES 8 – 9. Pergalumna paralongisetosa sp. nov., adult: 8 — dorsal view; 9 — ventral view, legs not shown. Scale bar 300 μm.

FIGURES 10 – 12. Pergalumna paralongisetosa sp. nov., adult: 10 — sensillus; 11 — pteromorph; 12 — dorso-lateral view of prodorsum. Scale bars (10) 20 μm, (11) 100 μm, (12) 200 μm.