View Image Gallery of Tribe Gonodontini

This tribe was defined by Forbes (1948) at a time when the type species of Gonodontis Hübner was thought to be Odontopera bidentata Clerck, a species perhaps allied to the Ennomini. The type species was established as delia Cramer by Warren (1893), a fact recorded by Fletcher (1979) but overlooked in the past. Hence any concept of the tribe must now be based on delia and allied taxa. These include the two Indo-Australian genera discussed below, one of which is Gonodontis, the other Xylinophylla Warren.

The African genera Xenimpia Warren and Coenina Walker show some similarities in wing shape and facies, but Coenina, unlike Xenimpia, does not share many male genitalic features with the Indo-Australian genera. The uncus in Coenina bears some similarities but a gnathus is present, the vinculum is divided with slight lateral loops that often support coremata, the valve has a strong costal zone, and the eighth sternite of the abdomen is not bilobed. There is no setal comb on sternite 3, and the tympanal organs are relatively much smaller.

Unusual features shared by Gonodontis, Xylinophylla and Xenimpia include: strong sexual dimorphism in facies and wing shape, the females with more crenulate wing margins; an excavate hindwing apex; a punctate forewing submarginal with white spots, when present, invariably strong subcostally; the uncus is robust, laterally setose, set on a tegumen that is deep throughout and appears to be contiguous with the vinculum; the gnathus is absent; there is a strong saccus; the valve lacks a distinct costa, and its lamina is evenly scattered with dorsally directed setae; the male eighth sternite is often bilobed, centrally cleft; the ovipositor lobes are long, narrow, with long apodemes and with a basal zone of setae that are much longer than those over the tapered apical portion; ventrally between the lobes is a narrow, wedge-shaped sclerotisation. The male antennae are bipectinate over the basal two thirds in Gonodontis and Xenimpia, ciliate in Xylinophylla. A setal comb on male sternite 3 is present only in Xylinophylla, as are lateral coremata between segments 4 and 5, and 5 and 6.

The larvae of the Indo-Australian genera are described below, and appear to be characterised by the presence of paired subdorsal tubercles, particularly on the anterior abdominal segments. There is no apparent host-plant specialisation. The type species of Xenimpia has been reared from the family Rutaceae (Pinhey, 1975).

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