Bakerdania urbanensis Sevastianov, 1974

Khaustov, Alexandr A., 2011, Nomenclature changes in the mite families Neopygmephoridae and Pygmephoridae (Acari: Heterostigmata: Pygmephoroidea) with redescription of two little known species, Zootaxa 2809, pp. 47-57 : 49-51

Bakerdania urbanensis Sevastianov, 1974

Figs. 1–5 .

Bakerdania nouri Sevastianov and Zahida Al Douri, 1989: 31 , fig. 5 syn. nov.

I examined female holotypes of Bakerdania nouri Sevastianov and Zahida Al Douri, 1989 and Bakerdania urbanensis Sevastianov, 1974 described from Russia. Comparison of holotypes of B. nouri and B. urbanensis revealed their conspecificity. Therefore I consider B. nouri syn. nov. as a junior synonym of B. urbanensis . I redescribe B. urbanensis because original descriptions of B. urbanensis and B. nouri are incomplete.

Description. FEMALE. Gnathosoma ( Fig. 2 ). Gnathosomal capsule hypognathous. Dorsally with 2 pairs of smooth subequal setae (cha, chb). Dorsal medial apodeme well developed. Ventral gnathosoma with 1 pair of subcapitular setae m. Palps free articulated with gnathosomal capsule, with setae dFe and dGe dorsolaterally, 1 small solenidion and accessory setigenous structure ventrally and terminated with small claw.

Idiosomal dorsum ( Fig. 1 ). Idiosomal length 264, width 172. Prodorsum with 2 pairs of setae (v 2, sc 2), 1 pair of capitate trichobothria (sc 1) and 1 pair of round stigmata. All dorsal plates with numerous small dimples. Setae v 2 smooth, other dorsal setae distinctly barbed. Setae v 2, c 2, and h 2 pointed. Other dorsal setae obtuse. Length of dorsal setae: v 2 5, sc 2 17, c 1 52, c 2 81, d 85, e 38, f 109, h 1 86, h 2 84. Distances between dorsal setae: v 2–v2 60, sc 2– sc 2 62, c 1– c 1 84, c 1– c 2 36, d–d 62, e–f 18, f–f 69, h 1– h 1 26, h 1– h 2 25.

Idiosomal venter ( Fig. 2 ). All ventral setae distinctly barbed, pointed. Setae 1 b not bifurcate. All ventral plates with numerous small dimples. Ap1 and ap2 well developed and joined with presternal apodeme (appr); presternal and sejugal (apsej) apodemes well developed; secondary transverse apodeme present near the bases of setae 2 a and 2 b and not joined with appr; apodemes 3 (ap3) well sclerotized, straight and relatively long. Apodemes 4 (ap4) well sclerotized and long, apodemes 5 absent. Posterior margin of posterior sternal plate straight. Posterior margin of aggenital plate distinctly concave in middle part. Length of pseudanal setae: ps 1 42, ps 2 29, ps 3 22.

Legs ( Figs. 3–5 ). Leg I ( Fig. 3 ). Tibiotarsus not thickened, with terminal claw situated on distinct pretarsus, tip of the claw thin, twisted. Length of solenidia ω1 16 <ω2 18> φ1 11> φ2 8; ω2 and φ2 baculiform, φ1 clavate, ω1 finger-shaped. Eupathidium ft” distinctly shorter than ft’. Setae dFe broadened, hook-like. Setae l’FeI, l’GeI and v” GeI obtuse. Leg II ( Fig. 4 ). Tarsus with sickle-like padded claws and large empodium. Solenidion ω 16 long, finger-shaped, solenidion φ weakly clavate. Setae dFeII, l’FeII, and v”FeII obtuse. Setae pl” spiniform, smooth, setae tc’ spiniform, slightly curved and weakly barbed. Leg III. Claws of same shape as on tarsus II. Solenidion φ weakly clavate. Setae dFeIII obtuse. Leg IV ( Fig. 5 ). Tarsus long and thin, with two small simple claws and small empodium. Solenidion φ weakly visible. Setae dFeIV, v’FeIV, v’GeIV, and v”TiIV obtuse.

MALE and LARVA unknown.

Material examined. Female holotype of B. urbanensis Sevastianov, 1974 , slide T-P-29, RUSSIA: Kamchatka, vicinity of Petropavlovs-Kamchatskiy, from the soil litter, September 1970, coll. A.D. Petrova-Nikitina; female holotype of B. nouri Sevastianov and Zahida Al Douri, 1989 , slide P-T-50, RUSSIA: Tatarstan, settl. Ranfa, oak litter, 16 May 1968, coll. T.I. Artemyeva.

Figures

FIGURES 1 – 2. Bakerdania urbanensis Sevasianov, 1974, female, 1 — dorsum, 2 — venter. Scale bar 50 μm.

FIGURES 3 – 5. Bakerdania urbanensis Sevasianov, 1974, female, 3 – 5 — legs I, II and IV, respectively. Scale bar 20 μm.