Charissa (Pterygnophos)

Erlacher, Sven, Palma, Laura Marrero & Erlacher, Josepha, 2017, A systematic revision of Charissa, subgenus Pterygnophos Wehrli, 1951, with description of a new species (Lepidoptera: Geometridae), Zootaxa 4341 (3) : -

Key to Charissa (Pterygnophos) species: female genitalia structures

(Abbreviations in brackets refer to Fig. 1b )

The structure of the female genitalia is not basically different from some species of Charissa , subgenus Dysgnophos Wehrli, 1951 . Occasionally, it can be difficult to judge whether a specimen under examination is a female of Pterygnophos or of Dysgnophos . For this reason, using the provided key assumes that the female in question actually belongs to Pterygnophos.

1 Postvaginal plate (pvp) posteriorly almost not extending the antrum......................... C. (P.) beljaevi spec. nov.

- Postvaginal plate strongly extending the antrum............................................................ 2

2 Antrum comparatively short (1.57–1.83 mm) and broadly funnel-shaped (antrum width: 0.87–1.00 mm)... C. (P.) creperaria

- Antrum longer (1.77–2.91 mm) and slender (antrum width: <0.82 mm)......................................... 3

3 Antrum length> 2.2 mm and length of spined longitudinal folding (slf)> 1.3 mm ..................... C. (P.) agnitaria

- Antrum length 1.8–2.3 mm and length of spined longitudinal folding (slf) 1.1–1.3 mm ................................................................................................... C. (P.) agnitaria or C. (P.) ochrofasciata Shape and measured values of genitalia structures are too similar and widely overlapping, making a diagnosis ambiguous. Fur- ther information, for example origin of the specimen, should be taken into account and, if possible, comparative material should be used.

Figures

FIGURE 1. Structures of the genitalia in Charissa, subgenus Pterygnophos, based on the example of C. (P.) beljaevi spec. nov. a) — male, b) — female. ab: appendix bursae; ae: aedeagus; an: antrum; ap: apex; c: cornutus; cb: corpus bursae; co: costa; gn: gnathos; ju: juxta; op: ovipositor; pvp: postvaginal plate; sa: saccus; slf: spined longitudinal folding; sd: sclerotized valva dilation; un: uncus; vm: ventral valva margin; vp: valva process.