Pergalumna paradecoratissima, 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 : 28-30

Pergalumna paradecoratissima sp. nov.

( Figs 1–7 )

Diagnosis. Body size 780–962 × 630–747. Surface of prodorsum foveolate, surface of notogaster, pteromorphs and genital plates striate. Rostrum with two lateral teeth. Prodorsal setae setiform, slightly barbed. Interlamellar setae shorter than lamellar and rostral setae. Sensilli setiform, barbed. Anterior notogastral margin present. Three pairs of oval porose areas developed. Median pore present. Postanal porose area present, very small.

Description. Measurements. Body length 962 (holotype), 780–962 (mean 855; seven paratypes); body width 747 (holotype), 630–747 (mean 678; seven paratypes).

Integument ( Figs 1, 2 ). Body color brown. Surface of prodorsum and epimeres I foveolate (diameter of foveolae up to 12). Surface of notogaster, pteromorphs, lateral parts of epimeres and genital plates striate (striae of centrodorsal part of notogaster poorly visible).

Prodorsum ( Figs 1–4, 6 ). Rostrum rounded in dorsal view, with two strong lateral teeth. Rostral (ro, 65–73) and lamellar (le, 98–110) setae setiform, barbed. Interlamellar setae (in) shorter (49–53), thinner, slightly barbed. Sensilli (ss) longest setae on prodorsum (131–139), setiform, barbed. Porose areas Ad not evident. Lamellar (L) and sublamellar (S) lines well developed, parallel. Insertions of lamellar setae removed from lamellar lines. Exobothridial setae not present.

Notogaster ( Figs 1 , 5, 6 7 ). Anterior notogastral margin present, convex. Pteromorphs with slightly visible striae and pigmented ornament. 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 41–45 × 20–28, A 1 24–32 × 16–20, A 3 24–28 × 14–16. Median pore (mp) presented by the several pores between levels of notogastral alveoli h 1 and porose areas A3. Lyrifissures im located anteriorly to notogastral alveoli h 3.

Gnathosoma . Morphology typical for Pergalumna (see Engelbrecht 1972; Ermilov & Anichkin 2011a, 2011b). Epimeral region ( Fig. 2 ). Apodemes 1, 2, sejugal and 3 well visible. Four pairs of setiform, smooth epimeral setae observed; setal formula: 1–0–1–2. Setae 1b and 3c (57–65) longer than others (36–41).

Anogenital region ( Figs 2 , 7 ). Six pairs of genital (g 1, g 2 16–20, g 3– g 6 12–16), one pair of aggenital (ag, 4–8), three pairs of adanal (ad 1– ad 3, 4–8) and two pairs of anal (an 1, an 2, 4–8) setae thin and smooth. Anterior part of genital plates with two (g 1, g 2) or three (g 1– g 3) setae. Lyrifissures iad paranal, considerable below of level of the anal setae an 2. Adanal setae ad 3 inserted laterally to lyrifissures iad. Postanal porose area (Ap) small (12 × 8), oval. Legs. Morphology of leg segments, setae and solenidia typical for Pergalumna (see Engelbrecht 1972; Ermilov & Anichkin 2011a, 2011b). Lateral tarsi claws slightly thinner than median claw. 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 .

*Roman letters refer to normal setae (e to famulus), Greek letters to solenidia. 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.

Material examined. The holotype (female) and seven paratypes (females) 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; three paratypes are deposited in the collection of Siberian Zoological Museum, Novosibirsk, Russia; four 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 decoratissima Pérez-Íñigo & Baggio, 1986 .

Remarks. In having the combination of foveolate prodorsum, striate notogaster, setiform sensilli, interlamellar setae shorter than lamellar and rostral setae, absence of anterior notogastral margin and three pairs of notogastral porose areas, Pergalumna paradecoratissima sp. nov. is very similar to Pergalumna decoratissima Pérez-Íñigo & Baggio, 1986 from Brazil (see Pérez-Íñigo & Baggio 1986). However it clearly differs from the latter by rounded rostrum, having two lateral teeth (versus pointed rostrum, not having lateral teeth in P. decoratissima ), narrower body size (780–962 × 630–747 in P. paradecoratissima sp. nov. versus 810–860 × 780–810 in P. decoratissima ), smooth anal plates (versus striate in P. decoratissima ), epimeral setae 1b and 3c considerable longer than others (epimeral setae differ slightly in length in P. decoratissima ).

Figures

FIGURES 1 – 2. Pergalumna paradecoratissima sp. nov., adult: 1 — dorsal view; 2 — ventral view, legs not shown. Scale bar 200 μm.

FIGURES 3 – 7. Pergalumna paradecoratissima sp. nov., adult: 3 — rostrum, dorso-anterior view; 4 — sensillus; 5 — pteromorph; 6 — dorso-lateral view of prodorsum; 7 — posterior view. Scale bars (3) 50 μm, (4) 20 μm, (5 – 7) 100 μm.

Tables

TABLE 1. Leg setation and solenidia of Pergalumna paradecoratissima sp. nov. (same for Pergalumna paralongisetosa sp. nov., Pergalumna ecuadorensis sp. nov. and Galumnopsis lanceosensilla sp. nov.)

Leg	Trochanter	Femur	Genu	Tibia	Tarsus
I	v'	d, (l), bv''	(l), v', σ	(l), (v), φ1, φ2	(ft), (tc), (it), (p), (u), (a), s, (pv), v', (pl), l'', e, 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)