Ingrassiella melanopogoni Constantinescu

Constantinescu, Ioana Cristina, Chișamera, Gabriel, Pocora, Viorel, Stanciu, Cătălin & Adam, Costică, 2013, Two new species of feather mites (Acarina: Analgoidea) from the Moustached Warbler, Acrocephalus melanopogon (Passeriformes, Acrocephalidae), in Romania, Zootaxa 3709 (3), pp. 267-276 : 268-270

Ingrassiella melanopogoni Constantinescu sp. nov. ( Figs. 1–3 )

Type material. Male holotype (ANA081), 5 male and 6 female paratypes (ANA082, ANA083) from Acrocephalus melanopogon , ROMANIA: Tulcea, The Danube Delta Biosphere Reserve, Letea, 23 September 2010, coll. I.C. Constantinescu.

Description. MALE (holotype, Fig. 1 ). Idiosoma size (length × width) 220 × 95 (idiosomal size of 5 paratypes 210-220 × 90-93). Prodorsal shield size 55 × 45, narrowed in anterior part, with posterior margin concave, with pair of narrow and acute extensions 20 in lenght arising from posterolateral angles and not extending to anterior margin of hysteronotal shield, ornamentation finely granular. Setae si about 5 long, situated just posterior to posterior margin, distance si-si 30, setae se 60 long, located on soft cuticle between prodorsal shield and scapular shields, distance se-se 55. Hysteronotal shield length (measured from the anterior margin to bases of ps1 setae) 135, maximum width 45, surface granular, anterior margin convex, lateral margins between levels of trochanters III and IV noticeably convex, opisthosomal part at bases of opisthosomal lobes with pair of rounded fields. Opisthosomal lobes nearly rectangular, short, terminal cleft shaped as inverted V, 18 long. Setae d2 very long, about 85, extending beyond level of trochanters IV, setae e2 15 long. Distance between prodorsal and hysteronotal shields along median line 25. Opisthosomal lobes with very long setae h2 and h3 about 95 long, setae f2 15 and ps1 5, filiform. Setae c2 fine, 12 long, located on soft cuticle between hysteronotal shield and humeral shields. Scapular shields with angular external protuberance in anterior half. Humeral shields extending ventrally and fused with epimerites III, bearing setae cp about 90 long and setae c3 30 long. Epimerites I fused into a Y, epimerites II straight. Coxal setae 1a very short, about 5 long; setae 4b and 3a 15 long; setae 4a 16 long, situated at same level with setae ps3 5 long; setae g 28 long, located near basis of genital arch, setae ps2 18 long. Genital arch width 22, aedeagus minute, epiandrum absent. Adanal suckers circular, 8 in diameter, distance between their centers 18. Legs ( Fig. 3 ). Femur-genua of legs I and II with lateral angular processes, especially long on leg II. Legs III and IV subequal in lenght, leg IV slightly thicker and with tibiotarsal pincers formed by tarsus and thick ventral apophysis of tibia.

FEMALE (paratype, Fig. 2 ). Idiosoma considerably longer than in male, length × width 315 × 105 (idiosomal size of 5 paratypes 320-340 × 90-95). Prodorsal shield similar to that of male, length 55, width 45, distance between si-si 30 and their lenght 5, distance between se-se 60 and their lenght 65. Hysteronotal shield narrow, 155 × 47, anterior margin convex and posterior margin concave, surface fine granular. Setae d2 90 long, e2 70 long. Distance between prodorsal and hysteronotal shields along median line 25. Pygidial shields placed posterolaterally, with inserted setae f2 (13), h2 (130), h3 (150) and ps1 (15). Scapular shields like those of male, but reduced ventrally. Epimerites IIIa extended posteroventrally to lateral ends of ovioporus. Epimerites I and II as in male.

Differential diagnosis. Both sexes of Ingrassiella melanopogoni sp. nov. differ from those in all previously described species of the genus by having the extensions of the posterolateral angles of prodorsal shield shorter than in other known species and not extending to hysteronotal shield. Among previously known species I. melanopogoni is most close to I. acromiacantha Gaud, 1962 both species having a similar shape of the prodorsal and hysteronotal shields, a well developed angular processes on femur-genua II, and having legs III and IV subequal in lenght.

Males of the new species differ from I. acromiachanta by the shape of tarsus IV that lacks dorsobasal spin, form of setae h2 and h3, wich are subequal in length and represented by simple macrosetae, and lack of the supranal concavity. In males of I. acromiachanta , tarsus IV has dorsobasal spine, setae h3 is shorter than h2 and both setae are lanceolate in basal part, the supranal concavity is present.

Etymology. The species name, melanopogoni , derives from the specific name of the host species.

Figures

FIGURE 1. Ingrassiella melanopogoni Constantinescu sp. nov., male. A—idiosoma, dorsal view; B—idiosoma, ventral view.

FIGURE 2. Ingrassiella melanopogoni Constantinescu sp. nov., female. A—idiosoma, dorsal view; B—idiosoma, ventral view.

FIGURE 3. Ingrassiella melanopogoni Constantinescu sp. nov., dorsal view of male legs. A—D, legs I – IV, respectively.