Zadbimyia dubia sp. n.

Fig. 25 A–C

Diagnosis. Both the ejaculatory apodeme and the parameres in Z. dubia differ from that in the other Zadbimyia . The ejaculatory apodeme has an apical extensively broadened portion, reminding one of an oar-shape (Fig. 25 C). (One may consider that the broadened portion does not belong to the apodeme but is homologous to the narrow apicomedial portion of parameres as is present in other Zadbimyia .) The parameres form large, curved tusks with two-pointed apices, which are interlinked medially by a narrow bridge; the parameral apodemes are unusually large (Fig. 25 C).

Other male characters. Body length 1.8 mm. Head. Eye bridge narrower dorsally than laterally, 6–7 ommatidia long dorsally. Scape compact, broader than long, markedly broader than pedicel. With 17 flagellomeres. Fourth flagellomere (Fig. 25 B): neck length 0.3 × node length, neck with microtrichia basally. Palpus 3-segmented, segments thicker than in other Zadbimyia . Thorax. Anepisternum asetose. Terminalia. Gonocoxites robust, ventral emargination small, broadly U-shaped, membranous at base of U, a large portion below emargination pigmented (Fig. 25 A). Gonostylus small, curved, on apical half pigmented, evenly tapered, apex narrowly rounded (Fig. 25 A), with 1+2 short bristles dorso-subapically. Ejaculatory apodeme longer than parameres (Fig. 25 C). Hypoproct undivided medially, concave apicomedially (Fig. 25 A).

Remark on classification. Zadbimyia dubia is another species exhibiting several character states not found in the congeneric species (eye bridge dorsally narrowed, scape shortened, anepisternum asetose, hypoproct undivided). As with Z. aberrans, we assume that once the intrageneric biodiversity is more thoroughly studied, Z. dubia will no longer appear so strikingly different.

Etymology. The name dubia is a Latin adjective meaning dubious, in reference to the somewhat uncertain generic assignment of this species.

Holotype. Male, Costa Rica, San José province, Moravia, Zurquí de Moravia, 1600 m, 17 March 2013, bucket light trap, ZADBI Project (ZADBI #578, INBio #106319).