Ressia Sinev, 1988

Zhang, Di & Li, Houhun, 2023, Review of the genus Ressia Sinev, 1988 (Lepidoptera: Cosmopterigidae), with descriptions of four new species from China, Zootaxa 5360 (4), pp. 583-592 : 584

Ressia Sinev, 1988

Ressia Sinev, 1988: 113 .

Type species: Ressia quercidentella Sinev, 1988 .

Diagnosis. Ressia is diagnosed by the scape of the antennae with pectens basally, the sickle-shaped labial palpi with the third palpomere longer than the second palpomere ( Figs 1a–b ); the forewings with a white or silvery white subbasal fascia and 3–4 distal speckles; the male eighth tergum with a heavily sclerotized furcate process, and the pleural lobes of the male eighth segment symmetrical or asymmetrical. In the male genitalia, Ressia can be distinguished by the socii with the right brachium much longer than the left one; the valvae with a long stalk and a distinctly inflated cucullus with dense setae on the ventral surface; the slender left valvella with sparse setae distally and the absence of right valvella. In the female genitalia, Ressia can be distinguished by the sterigma symmetrical or asymmetrical, and the ductus seminalis arising from the corpus bursae right anterior to the ductus bursae.

Ressia is similar to the Polynesian genus Iressa Clarke, 1917 in venation ( Fig. 2 ). Zhang & Li (2010) gave a more detailed diagnosis of the two genera.

Figures

FIGURES 1–2. Head and wing venation of Ressia species. 1a–b. Head of R. quercidentella from front and lateral view; 2. Wing venation of R. quercidentella, slide No. ZD21579. Scales = 0.5 mm.