Cacatualges probosciger, 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 : 485-488

Cacatualges probosciger sp. n.

( Figs. 27 , 28 )

Type material. Male holotype ( MNHN 34 G6) from Probosciger aterrimus (Gmelin) ( Cacatuidae ), New Guinea, no other data.

Depository. MNHN.

Description. Male (holotype). Idiosoma, length × width, 300 × 205, length of hysterosoma 210. Prodorsal shield: roughly pear-shaped, without posterolateral extensions, without median ridges, posterior margin rounded and extending to level of scapular setae se, length along midline 70, greatest width 32 ( Fig. 27 A). Scapular setae se, si situated on striated tegument, setae se separated by 54. Hysteronotal shield completely fused with humeral shields, anterior margin straight, greatest length from anterior margin to level of setae h3 195, surface with a pair of longitudinally striated patches situated mesal to area of humeral shields. Setae c2 situated on striated tegument slightly anterior to corresponding humeral shields. Lateral margins of opisthosoma lobes converging posteriorly, width of opisthosoma at level of setae f2 66. Opisthosomal lobes short, with rounded apices; terminal cleft small triangular; interlobar septa long, not extending to level of setae e2; length of cleft from anterior end to bases of h3 33, length of cleft including septa 65. Interlobar membrane well-developed; incision in this membrane triangular, with widely rounded anterior end, 18 long; terminal extensions of interlobar membrane short and rounded, 14 long. Lateral membrane with smooth lateral margins, posterior ends without extensions. Setae d2 extending to midlevel of terminal cleft, setae e2 extending to level of lobar apices. Setae h2, h3 and ps1 situated on lobar apices, approximately at same transverse level, setae f2 situated slightly anterior to them. Setae f2, ps1 short filiform, subequal to distance between bases of setae h3. Setae ps2 situated on posterolateral margin of terminal extension of interlobar membrane, extending beyond apices of tarsi IV. Distance between dorsal setae: c2:d2 58, d2:e2 72, e2:h3 65, h2:h2 60, h3:h3 48, ps1:ps1 33.

Epimerites I fused as a Y, sternum about 1/3 of the total length of epimerites, area between anterior parts not sclerotized ( Fig. 27 B). Rudimentary sclerites of epimerites IIa absent. Epimerites IIIa long, sclerotized areas wide, anterior end with truncate extension and straight. Coxal fields IV closed. Genital apparatus narrow, 28 × 15; paragenital apodemes absent; genital shield small, poorly sclerotized, bearing setae g. Adanal shield represented by a pair of sclerites bearing setae ps3. Adanal suckers slightly oval, small, longitudinal diameter 14. Setae 4b situated anterior to level of setae 3a. Setae 1a filiform; setae 4b extending to genital setae g; setae 3a extending to level of adanal suckers. Distance between ventral setae: 4b:g 34, g:ps3 45, ps3:h3 70.

Tarsus I with ventral setae la, ra, and wa filiform, seta s slightly thickened basally ( Fig. 28 A). Genual solenidia σ 1 I 32, σ III 12 long. Tarsus II with seta s spatuliform, seta wa enlarged and flattened in basal 2/3, with filiform apex ( Fig. 28 B). Ambulacral disc I normally developed, oval; ambulacral disc II rudimentary; ambulacrum of tarsus III absent, ambulacrum of tarsus IV small finger-like, ambulacral disc absent. Legs III with tarsus extending beyond lobar apices. Tibia III without spine-like apical extension, 75 in length, seta kT III not extending to midlevel of tarsus III ( Figs. 27 , 28 C). Tarsus III 78 long, claw-shaped; setae w spatuliform with filiform apex; setae d, e, f situated approximately at level of distal one third of this segment. Tibia IV 53 long, without dorsal ridge; tarsus IV 33 long, with truncate apical extension ( Fig. 28 D). Length of ambulacral discs I 18.

Female. Unknown.

Differential diagnosis. Males of the new species, Cacatualges probosciger sp. n., differ from those of C. microdiscus by the following features: dorsal setae e2 are short and reach only the level of the lobar apices; the incision in the interlobar membrane is wide and rounded anteriorly, the adanal shield is split into two pieces bearing setae ps3, the genital apparatus is narrow, with its basal width being subequal to the distance between setae g, and seta d of tarsus III is shorter than half the length of this segment. In males of C. microdiscus , dorsal setae e2 extend far beyond the level of the lobar apices; the incision in the interlobar membrane is triangular, the adanal shield is entire, with setae ps3 near its tips, the base of the genital apparatus is twice as wide as the distance between setae g, and seta d of tarsus III is subequal in length to this segment.

Etymology. The specific epithet is taken from the generic name of the type host and is a noun in apposition.

Figures

FIGURE 27. Cacatualges probosciger sp. n., male. A—dorsal view, B—ventral view.

FIGURE 28. Cacatualges probosciger sp. n., legs of male. A—leg I, B—leg II, C—tibia and tarsus III, D—tibia and tarsus IV.