Dubininia pezopori, Mironov, Sergey V., Ehrnsberger, Rainer & Dabert, Jacek, 2017

Mironov, Sergey V., Ehrnsberger, Rainer & Dabert, Jacek, 2017, Feather mites of the genera Dubininia and Cacatualges (Acari: Xolalgidae) associated with parrots (Aves: Psittaciformes) of the Old World, Zootaxa 4272 (4), pp. 451-490 : 462-465

Dubininia pezopori sp. n.

( Figs. 7–9 )

Type material. Male holotype ( TMAG. J5963) and 1 female paratype ( TMAG J5964) from Pezoporus wallicus (Kerr) (Psittaculidae) , Australia, Tasmania, SE Cape Track, 5 July 2003, coll. O. Seeman .

Depository. Holotype and paratypes—TMAG.

Description. Male (Holotype). Idiosoma, length × width, 465 × 350, length of hysterosoma 305. Prodorsal shield: narrowly oval, without posterolateral extensions, with a pair of median ridges, posterior end extending beyond level of scapular setae se, length along midline 92, greatest width 48 ( Fig. 7 A). Scapular setae se, si situated on small circular plates, setae se separated by 65. Hysteronotal shield completely fused with humeral shields, anterior margin shallowly concave, greatest length from anterior margin to level of setae h3 295, surface with a pair of longitudinally striated patches mesal to area of humeral shields. Cupules ia visible on striated patches. Setae c2 situated on striated tegument slightly anterior to hysteronotal shield. Outer margins of opisthosomal lobes slightly converging posteriorly, width of opisthosoma at level of setae f2 130. Opisthosomal lobes long and wide; terminal cleft triangular, its lateral margins slightly convex; interlobar septa not extending to level of setae e2; length of cleft from anterior end to bases of h3 35, length of cleft including septa 102. Interlobar membrane well-developed, incision in this membrane narrowly triangular, with acute anterior end, 45 long; terminal extensions of interlobar membrane widely rounded, almost semi-circular in shape, 35 long; lateral membranes with smooth lateral margins, posterior end without extension. Setae d2 not extending to midlevel of opisthosomal lobes, setae e2 extending beyond lobar apices. Setae h2, h3, f2 situated on lobar apices, their bases arranged in oblique row, setae ps1 situated at level of setae f2. Setae f2 long filiform, extending beyond tips of tarsi IV. Setae ps2 situated on posterolateral margin of terminal extensions of interlobar membrane, extending to apices of tarsi IV. Distance between dorsal setae: c2:d2 75, d2:e2 100, e2:h3 120, h2:h2 115, h3: h3 95, ps1:ps1 60, ps1:h3 6, h3:ps2 15.

Epimerites I fused as a V or Y, with very short sternum, area between free parts of epimerites not sclerotized ( Fig. 7 B). Rudimentary sclerites of epimerites IIa present. Epimerites IIIa long and straight. Coxal fields IV open. Genital apparatus enlarged posteriorly, 27 × 22; paragenital apodemes absent; genital shields absent, setae g on soft tegument. Adanal shield entire, bow-shaped, bearing setae ps3, with tips not extending to level of adanal suckers. Adanal suckers slightly oval, longitudinal diameter 21. Setae 4b situated slightly posterior to level of setae 3a. Setae 1a filiform, not extending to bases of setae 4b; setae 4b extending beyond bases of setae g; setae 3a extending to lobar apices. Distance between ventral setae: 4b:g 43, g:ps3 66, ps3:h3 130.

Tarsus I with ventral setae la, ra, and wa filiform, seta s thickened basally ( Fig. 8 A). Genual solenidia: σ 1 I 70, σ III 60 long. Tarsus II with ventral extensions half as long as this segment, seta s lanceolate at base, seta wa whipshaped with membraneous enlargement in medial part ( Fig. 8 B). Ambulacral discs I normally developed, oval with long triangular central sclerite; ambulacral discs II slightly smaller than disc I, central sclerite triangular; ambulacral discs III and IV strongly reduced. Legs III with tarsus and distal part of tibia extending beyond lobar apices. Tibia III with spine-like apical extension, 110 in length including extension; seta kT extending beyond ambulacrum of tarsus III ( Fig. 7 ). Tarsus III 122 long, with small spine-like apical process and dorsal crest ( Fig. 8 C); setae w half as long as segment length; setae e, f situated approximately at midlevel of segment, subequal in length. Tibia IV 80 long, with dorsal ridge; tarsus IV 40 long, with tridentate apical process ( Fig. 8 D). Length of ambulacral discs: I—20, II— 15, III and IV 8–9.

Female (paratype). Idiosoma length, length × width, 380 × 230, length of hysterosoma 255. Prodorsal shield narrowly oval, strongly narrowed in anterior part, without posterolateral extensions, with a pair of median ridges, median area with larger dots than in lateral areas, posterior margin slightly extending beyond level of setae se, length along midline 105, greatest width 50 ( Fig. 9 A). Scapular setae se, si situated on small circular plates, setae se separated by 70. Opisthosoma bluntly rounded. Hysteronotal shield absent. Distance between dorsal setae c2:d2 95, d2:e2 100, e2:h3 40, h2:h2 78, h3:h3 57. Setae c2, d2 and e 2 15 –20 long, all filiform.

Epimerites I fused into a narrow V, area between free parts not sclerotized ( Fig. 9 B). Epigynum bow-shaped, 14-45, tips not extending to level of genital papillae, setae 4b situated on epigynum. Apodemes of oviporus short, extending to midlevel between trochanters III and IV. Epimerites IIIa, IVa absent. Setae 1a filiform, not reaching the epigynum. Length of setae: 3a 40, 4a 90, 4b 20, g 30. Setae g and 3a approximately at the same transverse level. Distance between ventral setae: 4b:g 20, g:4a 78.

Legs I, II as in male. Genual solenidia σ 1 I 65, σ III 15 long. Length of leg segments: tibia III 41, tarsus III 57, tibia IV 46, tarsus IV 66. Tarsi III, IV without ventral extensions ( Fig. 9 ). Setae sR III filiform, 25 long; setae kT III filiform, subequal to corresponding tibiae; length of tibial solenidia: φ III 32, φ IV 28. Setae w III, w IV, r IV thickened basally, with filiform apex; remaining setae of tarsi III, IV filiform. Ambulacral discs: I—15, II—12, III and IV about 10 long. Ambulacral stalks of tarsi III, IV 2 times longer than corresponding discs. Setae d of tarsi III, IV slightly longer than corresponding tarsi.

Differential diagnosis. The new species D. pezopori sp. n., is most close to D. melopsittaci in having, in both sexes, short filiform coxal setae 1a with apices not reaching the level of the genital apparatus/epigynum. Dubininia pezopori differs from D. melopsittaci by the following features: in both sexes, scapular setae se, si are situated on small rounded sclerites separated from the main body of the prodorsal shield; in males, the terminal extensions of the interlobar membrane are large and semi-circular, the interlobar septa does not extend to the level of setae e2, and the idiosomal length is about 450 µm; in females, the epigynum is represented by a slightly curved sclerite, with the tips bearing setae 4b and not extending to the level of the genital papillae, setae d2 are 15–20 µm long and several times shorter than the distance between their bases. In both sexes of D. melopsittaci , scapular setae se, si are situated on posterolateral extensions of the prodorsal shield; in males, the terminal extensions of the interlobar membrane are poorly expressed, the interlobar septa extends to or beyond the level of setae e2, the idiosomal length is about 350 µm; in females, the epigynum is bow-shaped, with setae 4b situated at the midlevel of its branches and with the tips extending to the level of the genital papillae, setae d2 are longer (75–80 µm) and slightly exceed the distance between their bases.

Etymology. The specific epithet is derived from the generic name of the type host and is a noun in the genitive case.

Figures

FIGURE 7. Dubininia pezopori sp. n., male. A—dorsal view, B—ventral view.

FIGURE 8. Dubininia pezopori sp. n., legs of male. A – D—tibiae and tarsi I – IV, respectively.

FIGURE 9. Dubininia pezopori sp. n., female. A—dorsal view, B—ventral view.