Pilizetes anufrievi Ermilov, Sidorchuk and Rybalov

Ermilov, Sergey G., Sidorchuk, Ekaterina A. & Rybalov, Leonid B., 2010, New species of oribatid mites of the superfamily Galumnoidea (Acari: Oribatida) from Ethiopia, Zootaxa 2646, pp. 43-62 : 44-50

Pilizetes anufrievi Ermilov, Sidorchuk and Rybalov sp. nov.

( Figs. 1–24 )

Material examined. Holotype and ten paratypes were obtained from the Ethiopia, 6º38'N, 39º43'E, 1883 m above sea level, Bale Mountains National Park, Harenna Forest, in soil, collected by L. B. Rybalov, 23. 11. 2009.

Type deposition. The holotype and seven paratypes are deposited in the collection of the Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia; three paratypes are in the personal collection of the first author.

Etymology. The species is named in honor of the distinguished entomologist Prof. Dr. Georgiy A. Anufriev (Nizhniy Novgorod State University, Nizhniy Novgorod, Russia).

FIGURES 6–11. Pilizetes anufrievi sp. nov.: 6—rostral seta, 7—lamellar seta, 8—interlamellar seta, 9—sensillus, 10— notogastral seta h 3, 11—notogastral seta p 3. Scale bar 50 μm.

Diagnosis. With character states of Pilizetes as defined by Sellnick (1937), and summarized by Balogh and Balogh (1992). The new species has of the combination of following character states: body size 514–597 × 381–415; foveolate body integument; rostral (ro) and lamellar (le) setae setiform, barbed; interlamellar setae (in) long, thickened, barbed; sensilli (ss) thickened, with numerous barbs on one side; notogastral setae c long, setiform, barbed; other notogastral setae shorter than setae c, thickened, barbed; median pore mp present; oblong posterior notogastral tubercle present; anal plates with foveolae, genital plates with longitudinal folds and small foveolae.

Description. Measurements. Body length 597 (holotype), 514–597 (paratypes); body width 398 (holotype), 381–415 (paratypes).

Integument. Body color light brown to dark brown. Surface of body foveolate.

Prodorsum ( Figs. 1 , 3 , 6–9). Rostrum conical, rounded in dorsal view. Lamellar and sublamellar lines well developed. Dorsal part of prodorsum with well developed ridges. Rostral (65–69) and lamellar (131–139) setae setiform, barbed. Interlamellar setae long (176–184), thickened, barbed. Sensilli (139–151) thickened, with numerous barbs on one side. Exobothridial setae not observed.

Notogaster ( Figs. 1 , 4, 5 , 10, 11). Ten pairs of notogastral setae present: setae c long (135–155), setiform, barbed; other notogastral setae shorter (118–131) than setae c, thickened, barbed. Median pore mp and oblong posterior notogastral tubercle present.

FIGURES 12–17. Pilizetes anufrievi sp. nov.: 12—genital plate, right, 13—epimeral seta 4a, 14—aggenital seta, 15— anal plate, right, 16—adanal seta ad1, 17—ovipositor. Scale bar (12–16) 20 μm, scale bar (17) 100 μm.

Anogenital region ( Figs. 2 , 12, 14–16). Two pairs of anal (an 1 45–49, an 2 32–36) and three pairs of adanal setae (ad 1– ad 3, 57–65) thickened, barbed. One pair of aggenital setae (ag, 20–24) setiform, barbed. Six pairs of genital setae (20–24, anterior two pairs 24–28) thin, slightly barbed. Ovipositor (Fig. 17) elongate, narrow (278 × 61). Length of lobes 110, length of cylindrical distal part 168. Setae smooth, ψ1 ≈ τ1 (53–57) longer than ψ2 ≈ τ a ≈ τ b ≈ τ c (24–28). Setae k shorter (12–16).

Epimeral region ( Figs. 2 , 13). Only four pairs of setiform, barbed epimeral setae (32–41) observed.

Gnathosoma ( Figs. 18–20 ). Subcapitulum longer than wide: 135 × 110. Hypostomal setae a, m, h setiform, barbed; h (20) slightly longer than a (24), and longer than m (12). Two pairs of adoral setae (16) setiform, curved, smooth. Palp (length 110) with setation 0–2–1–3–9(+1ω). All setae (except on tarsus) barbed. Chelicera (length 168) with few blunt teeth on fixed and movable digits. Cheliceral setae long, setiform, barbed: cha (57) longer, than chb (36).

Legs ( Figs. 21–24 ). All legs tridactylous with stronger median and slender lateral claws. 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 . Almost all setae distinctly barbed; some ventral setae of tarsi and tibiae with long cilia. Solenidia ω1 and ω2 on tarsi II, σ on genua III straight or weakly curved, rod-like. Other solenidia rather long, setiform.

Distribution. At present, this species is only known from Ethiopia.

Remarks. Pilizetes anufrievi sp. nov. is similar to P. basilewskyi Balogh, 1958 (from Tanzania) and P. sellnicki Balogh, 1958 (from Angola) (see Balogh 1958, 1960, 1962; Balogh and Balogh 2002). Pilizetes basilewskyi differs from the new species by the dorsal part of prodorsum lacking ridges; by setae c shorter than other notogastal setae; and by the absence of posterior notogastral tubercle. Pilizetes sellnicki differs from the new species by smaller body size (390 × 300); sensilli without obvious barbs; smooth setae c; and the absence of posterior notogastral tubercle.

Several diagnostic keys for the species of Pilizetes have been published (see Balogh 1960; Mahunka 1984; Balogh and Balogh 2002).

Pilizetes anufrievi sp. nov. belongs to the Pilizetes species group with posterior notogastral tubercle. Only two species with this diagnostic character were known earlier: P. denticulatus Mahunka, 1986 and P. tuberculatus Mahunka, 1994 (see Mahunka 1986, 1994). A diagnostic key to the three known species of Pilizetes with posterior notogastral tubercle is presented below.

*Roman letters refer to normal setae (e – famulus), Greek letters refer to solenidia. One apostrophe (') marks setae on anterior and double apostrophe (") setae on posterior side of the given leg segment. Parentheses refer to a pair of setae.

Figures

FIGURES 1 – 2. Pilizetes anufrievi sp. nov.: 1 — dorsal view, 2 — ventral view, legs removed. Scale bar 200 μm.

FIGURES 3 – 5. Pilizetes anufrievi sp. nov.: 3 — dorso-lateral view of prodorsum, 4 — pteromorpha, 5 — caudal view. Scale bar (3 – 4) 100 μm, scale bar (5) 200 μm.

FIGURES 18 – 20. Pilizetes anufrievi sp. nov.: 18 — subcapitulum, 19 — palp, 20 — chelicera. Scale bar (18, 20) 50 μm, scale bar (19) 20 μm.

FIGURES 21 – 24. Pilizetes anufrievi sp. nov.: 21 — leg I, right, antiaxial view, 22 — leg II, without trochanter, right, antiaxial view, 23 — leg III, right, antiaxial view, 24 — leg IV, left, paraxial view; Ta, Ti, Ge – tarsi, tibiae, genua, accordingly. Scale bar 50 μm.

Tables

TABLE 1. Leg setation and solenidia of Pilizetes anufrievi sp. nov. (same for Taeniogalumna behanae sp. nov., Galumnella baleensis 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)