Johnsonomyia scabra Jaschhof, 1908

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 : 228-229

Johnsonomyia scabra Jaschhof sp. nov.

Fig. 13A–C

Diagnosis. Male genitalic characters specific to J. scabra are as follows (Fig. A). The weakly sclerotized tegmen with rounded apex has a somewhat uneven, almost scabrous surface distally (↓). The somewhat elongate gonostylus is evenly tapered towards the apex, which is narrowly rounded (↓) and bears a slender, slightly curved tooth. The ejaculatory apodeme is slightly broadened subapically. Females of this species are unknown.

Other male characters. Body length 2.8–3.2 mm. Head. Postgenal setae about 15, clustered. Eye bridge 6–7 ommatidia long dorsally. Scape and pedicel concolorous with flagellum, both unsetose. Fourth flagellomere (Fig. C) with neck and node equally long; node with subbasal setae intermingled with short hair-like translucent sensilla, a dense crenulate whorl medially, microtrichia only basally. Palpus (Fig. B) 1.3 times longer than head height, 4 segments, first to third segments with short hair-shaped translucent sensilla, fourth segment longest. Wing length 2.8–3.0 mm. Length / width 2.6. Costal break indistinct. Rs darkly pigmented. Legs with both setae and narrow scales. Tarsi slightly brighter than other segments. Claws slightly bent, untoothed. Empodia vestigial. Genitalia (Fig. A). Gonocoxae: ventral emargination deep, broadly U-shaped, in basal third occupied by weak, microtrichose membrane; ventral bridge unsetose, with faint transverse suture separating a pale portion above from a dark portion below; anterior processes of apodemes thick, shorter than distance separating them (↓). Gonostylus 3 times longer than wide.

Etymology. The species epithet, scabra , is a Latin adjective meaning scabrous, with reference to the uneven tegmen.

Type material. Holotype. Male (INB0004432267), Costa Rica, province San José, Moravia, Zurquí de Moravia, 1,600 m, old-growth cloud forest, 24–31 May 2013, Malaise trap (#2, creek 2 north), ZADBI Project (in MNCR). Paratypes. 2 males (INB0004432262, -264), same data as the holotype (in MNCR).

Figures

FIGURE 13 A – C. Johnsonomyia scabra, male. A: Genitalia, ventral (holotype). B: Palpus, vestiture omitted except for second segment, lateral (paratype). C: Fourth flagellomere, lateral (paratype). Scales = 0.05 mm. Ant pr = anterior process (of gonocoxal apodeme), gcx em = gonocoxal emargination, tgm = tegmen, tr sut = transverse suture.