Pergalumna ecuadorensis, 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 : 32-35

Pergalumna ecuadorensis sp. nov.

( Figs 13–18 )

Diagnosis. Body size 697–713 × 498–506. Surface of body smooth. Prodorsal setae and sensilli setiform, barbed. Interlamellar setae very long, longer than sensilli. Anterior notogastral margin absent. Three pairs of oval porose areas present. Median pore absent. Pteromorphs with wrinkles. Postanal porose area absent.

Description. Measurements. Body length 697 (holotype), 713 (paratype); body width 498 (holotype), 506 (paratype).

Integument. Body color brownish. Surface of body smooth (however microfoveolae on dorsal side poorly visible under high magnification).

Prodorsum ( Figs 13 , 15, 17 ). Rostrum rounded in dorsal view, weakly protruding. Rostral (41–45), lamellar (69–73) and interlamellar (184–192) setae and sensilli (151–155) setiform, barbed. Interlamellar setae very long, reaching of insertions of notogastral setae lm and porose areas Aa, if they are turned backwards. A pair of oval porose areas Ad present latero-posterior to interlamellar setae. Lamellar and sublamellar lines well developed, parallel. Insertions of lamellar setae removed from lamellar lines. Exobothridial setae not present.

Notogaster ( Figs 13 , 17, 18 ). Anterior notogastral margin absent. Pteromorphs with wrinkles. 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, all 24–28 × 12–16. Median pore absent. Lyrifissures im located anterior-laterally to notogastral alveoli h 3.

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

Epimeral region ( Fig. 14 ). Apodemes 1, 2, sejugal and 3 well visible. Four pairs of setiform, short (16), slightly barbed epimeral setae observed. Epimeral setal formula: 1–0–1–2.

Anogenital region ( Fig. 14 ). Six pairs of genital (g 1, g 2 16, others 12), one pair of aggenital (12), three pairs of adanal (16) and two pairs of anal (12) setae setiform, slightly barbed. Anterior part of genital plates with two genital setae (g 1, g 2). Lyrifissures iad paranal. Adanal setae ad 3 inserted laterally to lyrifissures iad. 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 paratype (female) 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; paratype is in the personal collection of the first author. Etymology. The specific name “ ecuadorensis ” refers to the country of origin, Ecuador.

Remarks. In having the combination of round rostrum, setiform sensilli, long and setiform prodorsal setae, absence of anterior notogastral margin, smooth body surface and three pairs of oval notogastral porose areas, Pergalumna ecuadorensis sp. nov. is similar to group species ( P. aeqiporosa Mahunka & Mahunka-Papp, 2009 from Kenya, P. andasibe Mahunka, 1996 from Madagaskar, P. dubitanda Hammer, 1972 from Polynesia, P. filiformis Fujikawa, 2007 from Japan, P. foveolata Hammer, 1977 from Polynesia, P. f r a t e r Balogh, 1960 from Congo, P. hauseri Mahunka, 1995 from Borneo, P. h e ro i c a ( Willmann, 1931) from Java, P. i n d i v i s a Mahunka, 1995 from Borneo, P. intermedia Aoki, 1963 from the Palearctic and Oriental regions, P. jongkyui Choi, 1986 from Korea, P. magnipora capillaris Aoki, 1961 from the Palearctic and Oriental regions, P. magnipora xishuanbanna Aoki & Hu, 1993 from China, P. mauritii Mahunka, 1978 from Mauritius, Reunion and Seychelles, P. myrmophila ( Berlese, 1914) from the Palearctic and Ethiopian regions, P. pauliensis Pérez-Íñigo & Baggio, 1991 from Brazil, P. pocsi Mahunka, 1984 from Tanzania, P. re m o t a ( Hammer, 1968) from New Zealand and India, P. s o m a l i c a ( Berlese, 1916) from Somalia, P. sulcatomarginata Mahunka, 1986 (see Mahunka, 1986a) from Kenya, P. tsavoensis Mahunka, 1986 (see Mahunka, 1986a) from Kenya, P. tsurusakii Starý, 2005 from Japan). However it is clearly distinguishable from all species listed above by the very long interlamellar setae (longer than sensilli and reaching of insertions of notogastral setae lm and porose areas Aa, if they are turned backwards, in P. ecuadorensis sp. nov.; not reaching of insertions of notogastral setae lm and porose areas Aa and often longer than sensilli in the other species).

Figures

FIGURES 13 – 14. Pergalumna ecuadorensis sp. nov., adult: 13 — dorsal view; 14 — ventral view, legs not shown. Scale bar 200 μm.

FIGURES 15 – 18. Pergalumna ecuadorensis sp. nov., adult: 15 — sensillus; 16 — pteromorph; 17 — lateral view of prodorsum; 18 — posterior view. Scale bars (15) 20 μm, (16 – 18) 100 μm.