Chesiadini

Schmidt, Olga, 2015, One century after: a reappraisal of the gnathos (sensu Pierce, 1914) in Larentiinae (Lepidoptera: Geometridae), Zootaxa 3974 (3), pp. 328-340 : 330-331

Tribe Chesiadini

Aplocera efformata ( Fig. 1 ). The gnathos arms are thin, less pronounced than in other chesiadine genera and partly fused with the tegumen. The base of the large anal tube with its long sclerotized subscaphium is connected to the gnathos and membrane of the fultura superior (which is ventrad of the anal tube).

Chesias linogrisearia ( Fig. 2 ). The gnathos arms are distinct, thin, long and weakly sclerotized, and connected to the base of the uncus laterally. The base of the medium sized anal tube with its distinct subscaphium is connected to the gnathos and membrane of the fultura superior (which is ventrad of the anal tube).

Docirava mundulata ( Fig. 3 ). The gnathos arms are distinct, sclerotized, stout, broadening and dentate proximally. The base of the anal tube with its broad sclerotized subscaphium is connected to the gnathos and membrane of the fultura superior (which is ventrad of the anal tube). Remarks. The dervenaria species-group, including D. mundulata , was only tentatively transferred to Docirava ( Karsholt et al. 2013, Hausmann, pers. comm.) but is questionable ( Hausmann & Viidalepp 2012).

Lithostege amoenata ( Fig. 4 ). The gnathos arms are distinct, weakly sclerotized and thickened at the base of the uncus. The base of the medium sized anal tube with its rather broad sclerotized subscaphium is connected to the gnathos and membrane of the fultura superior (which is ventrad of the anal tube). Remarks. Rajaei et al. (2011) mentioned that, “Chesiadine genera have an additional rib-like sclerite in male genitalia, from below the uncus to the hemitranstilla (partially fused to the lateral margins of tegumen in some Aplocera species)”. This rib-like sclerite is the gnathos described above.

Figures

FIGURES 1 – 2. Male genitalia apically: 1. Aplocera efformata. 2. Chesias linogriseata. Gnathos is shown in grey.

FIGURES 3 – 4. Male genitalia apically: 3. Docirava mundulata. 4. Lithostege amoenata. Gnathos is shown in grey.