Wingspan 10 to 11 mm. Two forms occur, the typical one with a large dorsal streak and reduced paler markings elsewhere, and f. quadruplella with four large creamy or whitish markings. There are also intermediates.

The larva mines the leaves of various plants such as Dock species, Loosestrife, Water-pepper, Redshank and Black Bindweed. An initial gallery leads to a blotch; later instars leaves the mine and feeds inside a cone-shaped leaf-roll, made by cutting a strip out of the leaf the leaf alongside the midrib.

Adult leafmine/roll

Provide backlit image of mine or photograph of leaf-roll

In areas containing the larval foodplants.

This species flies in September and overwinters as an adult, after which it can be found until April or May.

The larval foodplants are dock, knotgrass and loosestrife. Initially, a gallery is formed, this turning into a blotch, and later two successive conical leaf rolls.

Occurring locally in England, Scotland and parts of Ireland. In the Butterfly Conservation's Microlepidoptera Report 2011 this species was classified as local.

It appears to be uncommon in Leicestershire and Rutland, where there are few records. L&R Moth Group status = D (rare or rarely recorded).

http://www.leafmines.co.uk/html/Lepidoptera/C.phasianipennella.htm

https://bladmineerders.nl/parasites/animalia/arthropoda/insecta/lepidoptera/ditrysia/gracillarioidea/gracillariidae/gracillariinae/calybites/calybites-phasianipennella/