Dubininia charmosynae, 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 : 477-479

Dubininia charmosynae sp. n.

( Figs. 20 , 21 )

Type material. Male holotype and 1 male paratype ( MNHN 34F1) from Charmosyna pulchella Gray GR ( Psittaculidae ), New Guinea, no other data.

Depository. MNHN.

Additional material. 3 males from Charmosyna placentis (Temminck) (Psittaculidae) , no other collection data. 2 males ( MNHN 34 F9) from Trichoglossus haematodus (Linnaeus) (Psittaculidae) , New Guinea, no other data, (probably an accidental contamination).

Description. Male (holotype, sizes for 1 paratype in parentheses). Idiosoma, length × width, 320 (310) × 200 (210), length of hysterosoma 190 (210). Prodorsal shield: roughly shaped as narrow trapezium, posterior margin straight, surface with pair of median ridges, length along midline 74 (75), greatest width 55 (58) ( Fig. 20 A). Scapular setae se, si situated in posterolateral angles of the shield, setae se separated by 43 (47). Hysteronotal shield completely fused with humeral shields, anterior margin convex, greatest length from anterior margin to level of setae h3 210 (225), surface with a pair of longitudinally striated patches mesal to area of humeral shields. Setae c2 situated on anterior margin of humeral shields. Lateral margins of opisthosoma straight, width of opisthosoma at level of setae f2 88 (92). Opisthosomal lobes long, almost straight; terminal cleft semi-circular, with ends of posterior margins strongly divergent; interlobar septa extending to level of setae e2; length of cleft from anterior end to bases of h3 40 (38), length of cleft including septa 95 (90). Interlobar membrane well-developed, incision in this membrane triangular, 48 (50) long; terminal extensions of interlobar membrane roughly triangular, rounded apically, length of extensions from setae h3 to apex 26 (23) long. Lateral membranes with smooth lateral margins and acute posterior extension ( Fig. 20 B). Setae d2 extending to midlevel of terminal cleft, setae e2 extending to lobar apices. Setae h2, h3, f2 situated on lobar apices, their bases arranged in slightly oblique row; setae ps1 situated at level of setae f2. Setae f2 narrowly lanceolate, 52 (48) long, 8 (7) wide. Setae ps2 situated on posterolateral margin of terminal extensions of interlobar membrane. Distance between dorsal setae: c2:d2 48 (52), d2: e2 58 (65), e2:h3 95 (98), h2:h2 80 (78), h3:h3 58 (65), ps1:ps1 36 (42), ps1:h3 4 (5), h3:ps2 17 (15).

Epimerites I fused as a Y, sternum about 1/2 of the total length of epimerites, area between anterior parts strongly sclerotized ( Fig. 20 B). Rudimentary sclerites of epimerites IIa present. Epimerites IIIa long and straight.

Coxal fields IV open. Genital apparatus enlarged basally, 12 (13) × 8 (10); paragenital apodemes present, fused into horseshoe-shaped sclerite; genital shield absent, setae g on soft tegument. Adanal shield entire, bow-shaped, bearing setae ps3, with tips extending to midlevel of adanal suckers. Adanal suckers oval, longitudinal diameter 15 (15). Setae 4b situated slightly anterior to level of setae 3a. Setae 1a represented by macrosetae extending to anterior end of terminal cleft; setae 4b short, extending to base of genital arch; setae 3a enlarged and flattened in basal part, extending beyond trochanters IV. Distance between ventral setae: 4b:g 25 (26), g:ps3 45 (48), ps3:h3 98 (100).

Tarsus I with ventral setae la, ra, and wa filiform, seta s slightly thickened basally ( Fig. 21 A). Genual solenidia σ 1 I 32 (34), σ III 33 (30) long. Tarsus II with wide semi-circular ventral extensions, seta s lanceolate at base, setae wa whip-shaped ( Fig. 21 B). Ambulacral disc I normally developed, oval, with long triangular central sclerite; ambulacral disc II slightly smaller, with triangular central sclerite; ambulacral discs III and IV strongly reduced, much shorter that on tarsi I. Legs III with tarsus and distal part of tibia extending beyond lobar apices. Distal end of tibia III with ledge bearing solenidion φ and spine-like apical extension ( Fig. 21 C), 74 (72) in length including extension; seta kT filiform, extending to midlevel of tarsus III. Tarsus III 98 (96) long, with spine-like apical process; setae w half as long as segment length; seta e situated approximately at midlength of segment; seta f situated in basal one third, approximately equidistant from setae e and w. Tibia IV 48 (47) long, with dorsal ridge; tarsus IV 24 (25) long, with tridentate apical process ( Fig. 21 D). Length of ambulacral discs: I—18 (16), II –15 (14), III and IV—5–7.

Female. Unknown.

Differential diagnosis. The new species, Dubininia charmosynae sp. n., is close to D. lorina , in having the following features in males: setae f2 are lanceolate, setae 3a have a flattened and lanceolate enlargement near their bases, and the interlobar septa is equal to or longer than the terminal cleft. Males of Dubininia charmosynae sp. n. differ from the latter species by the features as follows: the posterior margin of the prodorsal shield is straight and without any extension between the bases of setae si, the sternum is long, approximately half the total length of epimerites I; the ventral process of tarsus II is narrow and seta f of tarsus III is situated equidistantly from the bases of setae w and e ( Figs. 20 A, B, 21B, C). In males of D. lorina , the prodorsal shield has a short and truncate median extension between the bases of setae si, the sternum is about 1/3 of the total length of epimerites I, the ventral process of tarsus II is semi-circular and the bases of setae e and f of tarsus III are close to each other and situated approximately at the midlevel of this segment ( Figs. 17 A, B, 18B, C).

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

Figures

FIGURE 17. Dubininia lorina (Trouessart, 1885), male. A—dorsal view, B—ventral view.

FIGURE 20. Dubininia charmosynae sp. n., male. A—dorsal view, B—ventral view.

FIGURE 21. Dubininia charmosynae sp. n., legs of male. A – D—tibiae and tarsi I – IV, respectively.