Wyattella japonica Jaschhof

Jaschhof, Mathias, 2016, A review of world Diallactiini (Diptera, Cecidomyiidae, Winnertziinae), with the description of six new genera and seventeen new species, Zootaxa 4127 (2), pp. 201-244 : 240-242

Wyattella japonica Jaschhof sp. nov.

Fig. 21A–F

Wyattella spec.— Jaschhof & Jaschhof 2013: fig. 20 (wing).

Differential diagnosis. Wyattella japonica differs from W. fungicola in that legs are unicolored (↔ fifth tarsomeres are brighter than other leg segments), claws are toothed (↔ untoothed), and the gonostylus has an apical tooth (↔ no apical tooth); from W. sinica in that the gonostylar tooth is larger and the posterior edge of the male ninth tergite is concave (↔ convex); and from W. ussuriensis in that, again, legs are unicolored and the female cercus has 8 (↔ 10) sawtooth-shaped spines. There are presumably more characters to distinguish these species, but the original descriptions of W. fungicola , W. sinica and W. ussuriensis do not yield more species-specific information to compare with W. japonica .

Description. Male. Head. Genal setae numerous, not clustered. Eye bridge 7–8 ommatidia long dorsally. Scape and pedicel concolorous with flagellum, both setose, scape larger than pedicel. Flagellomeres 14, nodes slightly broadened subapically, darkly pigmented. Neck of fourth flagellomere (Fig. C) as long as node, node with short setae on basal third, long sensory hairs with hooded alveoli intermingled with short hair-like translucent sensilla elsewhere, microtrichia everywhere. Clypeus with 0–1 seta. Palpus (Fig. E) as long as head height, 4 subcylindrical segments, apical segment longest, with small (sensorial?) depression apically. Thorax. Antepronotum, anepisternum and anepimeron setose. Both scutal and scutellar setae dense. Wing 5.5 mm long ( Jaschhof & Jaschhof 2013: fig. 20). Length / width 2.8. Costal break distinct. M1 obsolete apically. Vein btv unsetose. Legs unicolored, very densely covered in short setae and short, narrow scales. Basitarsal spines short. Claws small, thick, slightly bent, 1 large and 1 smaller tooth basally. Empodia vestigial. Genitalia. Ninth tergite subtrapezoid, darkly pigmented apically and centrally, posterior margin incised (↓, Fig. B). Gonocoxae (Fig. A): ventral portions very densely setose on posterior half, unsetose on anterior half; ventral emargination extending to

midlength gonocoxites of, anterior gonocoxae of that, its a space large, circular largely, occupied darkly pigmented by membranous area (↓),; medial densely bridges microtrichose barely projecting outgrowths, with of short, dense setae; apodemes with long, well-separated anterior processes. Gonostylus (Fig. A) stout, very densely setose, slightly curved, parallel-sided; apical tooth of moderate size, consisting of numerous thick spines merged with each other basally (↓). Tegmen membranous rather than sclerotized, weakly contoured on apical half, elongate subtriangular, rounded apically; parameral apodemes large, strongly sclerotized (Fig. A). Ejaculatory apodeme longer than tegmen, moderately sclerotized, with membranous cap apically (Fig. A). Hypoproct not traceable.

Female. Head. Flagellomeres 14, nodes elongate subcylindrical, darkly pigmented. Neck of fourth flagellomere (Fig. D) one third the length of node; node covered with long setae intermingled with short hairshaped translucent sensilla. Palpus (Fig. E) as in male. Wing 5.8 mm long. Legs. Claws slightly longer than in males, with 3 basal teeth decreasing in size. Ovipositor (Fig. F) telescopic; eighth segment long, narrow, with almost no setae; gonocoxa 8 with fine translucent sensilla (not illustrated), without setae; ninth tergite with about 5 ventroposterior setae; ninth sternite (= genital fork) thick, strongly sclerotized, broadened posteriorly; tenth segment one third the length of cerci, with row of 5 ventrolateral setae; basi- and disticercus largely merged with each other into a single body, with 2 rows of each 4 sawtooth-like spines dorsally, a row of 3 setae ventrolaterally, hair-shaped translucent sensilla of different sizes elsewhere. Two small, circular sclerotized spermathecae.

Etymology. The species epithet, japonica , refers to Japan, the country of provenance of the type material.

Type material. Holotype. Male (dissected and mounted on two microscopic slides), Japan, Honshu, prefecture Aomori, Towadako, Tsuta-onsen, in old-growth mixed deciduous forest predominated by buna (Japanese beech), 500–600 m, 25 Jun. 1999, sweepnet, M. Jaschhof (in KUEC). Paratypes. Male (prepared as the holotype) and 2 females, same data as the holotype (all in KUEC).

Figures

FIGURE 21 A – F. Wyattella japonica. A: Male genitalia, ventral (holotype). B: Apex of male ninth tergite, dorsal (paratype). C: Male fourth flagellomere, lateral (holotype). D: Female fourth flagellomere, lateral (paratype). E: Palpus, vestiture omitted except for second segment, lateral (paratype). F: Ovipositor, lateral (paratype). Scales 0.05 mm. Bc = basicercus, dc = disticercus, gx = gonocoxa, sg = segment, st = sternite, tg = tergite.