Trouessartia longidenticulata Constantinescu

Constantinescu, Ioana Cristina, Cobzaru, Ioana, Mukhim, D. Khlur B. & Adam, Costică, 2016, Two new species of the feather mite genus Trouessartia (Acari: Trouessartiidae) from Asia, Zootaxa 4137 (3), pp. 357-374 : 358-365

Trouessartia longidenticulata Constantinescu sp. n.

( Figs. 1–6 )

Description. MALE ( Figs. 1 , 2 , 3 A–E; holotype): Length of idiosoma from anterior end to bases of setae h3 300, greatest width at level of humeral shields 140. Length of hysterosoma from sejugal furrow to bases of setae h3 190. Prodorsal shield: length along midline 99, greatest width in posterior part 110, lateral margins not fused with scapular shields, antero-lateral extensions short and rounded, not extending to body margin between bases of legs I, II, surface without ornamentation ( Fig. 1 ). Internal scapular setae si filiform, 8 long, separated by 59; external scapular setae se situated near lateral margins of prodorsal shield, separated by 76. Vertical setae ve represented by alveoli. Setae c2 situated on humeral shields, lanceolate, with acute apex, 20 long. Setae c3 narrowly lanceolate with acute apex, 16 long. Dorsal hysterosoma with prohysteronotal shield and lobar shield completely separated. Prohysteronotal shield length 140, width at anterior margin 105, lateral margins with shallow incisions at level of trochanters III, dorsal hysterosomal apertures (DHA) absent. Dorsal setae d1, d2 present, minute. Length of lobar shield excluding lamellae 40. Apical parts of opisthosomal lobes approximate, separated by narrow terminal cleft; length of this cleft from anterior end to apices of lamellae 18, width in anterior part 4. Lamellae ovate in general shape, their margins with 10 long and sharp denticles, length from bases of setae h3 to lamellar apices 16. Setae h1 anterior to setae h2. Distance between dorsal setae: c2–d2 65, d2– e2 66, e2–h2 40, h2–h3 14, h2–h2 30, h3–h3 24, d1–d2 34, e1– e2 30. Epimerites I free. Rudimentary sclerites rEpIIa present, roughly ovoid. Genital apparatus situated between levels of trochanters III and IV, length 30, greatest width 14 ( Fig. 2 ). Epiandrum present, small, setae g long and thin, not touching at bases. Anterior and posterior genital papillae equidistant from midline, postgenital plaque absent. Adanal apodemes heavily sclerotized, with narrow lateral membrane, without apophyses. Translobar apodeme present. Adanal shields small, ovoid, bearing setae ps3. Anal suckers 10 in diameter. Anterior ends of epimerites IV not reaching level of setae 4b; epimerites IVa present, wide, anterior ends exceeding level of setae 4a. Setae 4b situated anterior to level of setae 3a, setae g situated posterior to level of setae 4a. Distance between ventral setae: 4b–3a 32, 4b–g 66, g–ps3 32, ps3–h3 60. Setae sR of trochanters III filiform, 14 long. Tarsus IV 32 long, modified setae d and e barrel-shaped, each with discoid cap, seta d situated at midlevel of segment on a small extension, setae e situated apically ( Fig. 3 D). Legs IV with ambulacral disc extending beyond level of setae h3.

FEMALE ( Figs. 4 , 5 , 6 A–E; 4 paratypes): Length of idiosoma from anterior end to apices of lamellar lobar processes 380–400, greatest width 155–160. Length of hysterosoma from sejugal furrow to apices of lamellar lobar processes 260–270. Prodorsal shield shaped as in male, 115–120 in length, 115–125 in width, surface without ornamentation. Setae si thin, filiform, 8–10 long, separated by 67–72, external scapular setae se situated near lateral margins of prodorsal shield, separated by 88–92. Setae c2 on humeral shields, lanceolate, with acute apex, 26–30 long. Setae c3 narrowly lanceolate, with acute apex, 16–18 in length. Hysteronotal shield length from anterior margin to bases of setae h3 225–235, width at anterior margin 115–120, lateral margins with shallow incisions at level of trochanters III, DHA absent, anterior part with small ovate lacunae, posterior part with big ovate lacunae in central area and small ovate lacunae at margins ( Fig. 4 ). Dorsal setae d1 present. Setae h1 filiform, 5–6 long, situated antero-mesal to bases of setae h2, 12–16 from each lateral margin of hysteronotal shield. Setae ps1 positioned dorsally on opisthosomal lobes, equidistant from outer and inner margins of lobe, closer to bases of h3 setae. Distance from bases of setae h3 to lamellar apices of lobes 21–26. Setae f2 absent. Supranal concavity open posteriorly into terminal cleft. Length of terminal cleft together with supranal concavity 82–86, width of cleft at level of setae h 3 15–18. Interlobar membrane occupying anterior ¼ of terminal cleft, distance from its anterior margin to membranous lobar apices 54–56. External copulatory tube absent, copulatory opening situated dorsally, near free margin of interlobar membrane. Spermatheca with primary spermaduct thickened in distal part, length of secondary spermaducts 16–20 ( Fig. 6 E). Distance between dorsal setae: c2-d2 73–76, d2- e2 70–76, e2-h2 48–54, h2-h3 36–42, h2-h2 46–54, h3-h 3 26–30, d1-d2 36–44, e1- e 2 31–38, h1-h 2 12–14, h1-h 1 28–34, ps1-h 3 8–10. Epimerites I free. Epigynum 28–31 in length, 72–76 in width ( Fig. 5 ). Epimerites IVa present, wide and short. Setae sR of trochanters III filiform, 1 8–22 long. Legs IV with ambulacral disc extending to midlevel between setae h2 and h3.

Type material. Male holotype ( ANA 610), and 4 female paratypes ( ANA 611, ANA 612, ANA 613, ANA 614), ex Pycnonotus cafer (Linnaeus) ( Passeriformes : Pycnonotidae ), INDIA: Meghalaya, Jaintia Hills, Kharkhana, 25°9'26.99"N, 92°12'24.37"E, 30 m, subtropical forest, 20 October 2014, coll. D.K.B. Mukhim.

Type deposition: Acarological Collection of the “Grigore Antipa” National Museum of Natural History, Bucharest, Romania.

Etymology. The specific epithet refers to the long spine-like denticles on terminal lamellae in males.

Differential diagnosis. The male of the new species, Trouessartia longidenticulata Constantinescu sp. n., shows a unique character state within the genus Trouessartia , in having the lamellae of the opisthosomal lobes with long and sharp denticles. The new species is very similar to T. latisetata Gaud, 1952 , described from Hypsipetes (=Ixocincla) madagascariensis (Müller) ( Passeriformes , Pycnonotidae ) in Madagascar ( Gaud 1952) in having the following features: in both sexes, the external scapular setae se are situated near the lateral margins of the prodorsal shield, the hysteronotal shield has a similar ornamentation and its lateral margins are with shallow incisions at the level of trochanters III, setae sRIII and si are filiform, setae c3 are narrowly lanceolate, with acute apex. Males of both species have setae g spaced apart at the bases, the anterior ends of epimerites IVa extend beyond the level of setae g and 4a, the adanal apodemes are without apophyses and the translobar apodeme is present. Females of both species have setae h1 filiform, setae ps1 closer to base of h3 setae, the supranal concavity is open posteriorly into the terminal cleft and the external copulatory tube is absent. Trouessartia longidenticulata Constantinescu sp. n. differs from T. latisetata by the following character states: in both sexes, setae c2 are lanceolate; in males the prohysteronotal shield and the lobar shield are completely separated. In both sexes of T. latisetata , setae c2 are spiculiform; in males, the prohysteronotal and lobar shields are connected.

Figures

FIGURE 1. Trouessartia longidenticulata Constantinescu sp. n., male holotype: dorsal view of idiosoma.

FIGURE 2. Trouessartia longidenticulata Constantinescu sp. n., male holotype: ventral view of idiosoma.

FIGURE 3. Trouessartia longidenticulata Constantinescu sp. n., male holotype: A – D legs I – IV in dorsal view, respectively; E – ventral view of genital apparatus. Abbreviations: ea – epiandrum; gp – genital papillae; pm – parameres.

FIGURE 4. Trouessartia longidenticulata Constantinescu sp. n., female paratype: dorsal view of idiosoma.

FIGURE 5. Trouessartia longidenticulata Constantinescu sp. n., female paratype: ventral view of idiosoma.

FIGURE 6. Trouessartia longidenticulata Constantinescu sp. n. female: A – D legs I – IV in dorsal view, respectively; Espermatheca. Abbreviations: hs—head of spermatheca; pd—primary spermaduct; sd – secondary spermaduct.