| | Insects of Britain and Ireland: the genus Phyllonorycter (Lepidoptera-Gracillariidae) |
Associated with shrubs. On Corylaceae; Corylus.
Larvae. The larvae mining in leaves; in the upper-side. Found in July, or September to October. The larva not constructing a definite cocoon.
Pupa. The pupal cremaster with two pairs of hooked processes (and very long setae); cremastal processes with the inner pair thin and hooked inwards, the outer stouter with hooked tips.
Adults. Antennae grey. Head dirty white and fuscous. Thorax pale brown, or orange; with a conspicuous median pale streak. Wing-span 7–8 mm. Forewings light to medium golden ochreous; not clear shining white; with a well defined basal streak (this narrow, reaching to one third or more). The basal streak pale; not dark-edged above. Forewings with well defined pale strigulae (four costal, three dorsal). Costal strigulae 4. The first costal strigula extended basipetally along the costa. Dorsal strigulae 3. Forewings with the first costal strigula approaching a dorsal one at an acute angle; with one transverse pale fascia (the third costal joining the third dorsal). Forewings with conspicuous dark apical marking. Forewing apical marking comprising an elongate blackish apical spot to comprising a dark apical strigula. The forewing fringe narrowly dark-lined along the bases of the cilia and narrowly dark-lined along the tips of the apical cilia. The forewing basal fringe line complete. Hindwing cilia light fuscous. Posterior tarsi with dark spots.
The left and right male genital valvae very similar in size and form (broad and blunt, with a spine from the mid-costa). The left male genital valva not spine-tipped; (this and the right one) with a single mid-costal marginal spine. The left and right male genital valvae interpretable as having free costae. The left and right free costae similar (both very short and spineless). The aedeagus long and relatively slender with a triangular barb towards the apex. The female genitalia exhibiting a signum on the bursa copulatrix (pointed at either end).
Adults abroad May and August.
Illustrations. • Phyllonorycter coryli: Jacobs (1945). • Phyllonocycter species on Hazel. 1, Phyllonorycter coryli; 2, P. nicellii. • P. corylifoliella, P. coryli and P. quinnata (as carpinicolella): Stainton (1855) Plate II, under Lithocolletis. PHYLLONORYCTER. 1, P. corylifoliella: imago (1m), larva (1a) and two mined hawthorn leaves (1b). 2, L. coryli: imago (2m), larva (2a) and mined hazel leaf (2b). 3, P. quinnata: imago (3m), larva (3b) and mined hornbeam leaf (3b). • Stainton (1855), Plate II: original legend.. • Phyllonorycter coryli: Ian Kimber (2018), UKmoths https://ukmoths.org.uk/. • Phyllonorycter coryli, genitalia: Pierce and Metcalfe (1935).
We advise against extracting comparative information from the descriptions. This is much more easily achieved using the DELTA data files or the interactive key, which allows access to the character list, illustrations, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, and distributions of character states within any set of taxa. See also Guidelines for using data taken from Web publications.
Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 2003 onwards. Insects of Britain and Ireland: the genus Phyllonorycter (Lepidoptera-Gracillariidae) Version: 14th April 2022. delta-intkey.com’.
