Oak Slug Sawfly - Caliroa annulipes


The common name comes from the slug like appearance of the larvae and the fact that Oak is often favoured as their host plant, although other trees such as Lime are used.  The larvae are quite transparent when young, becoming greener with age. The larvae of Caliroa annulipes lack yellow at the head end - as seen in some other Caliroa larvae. The adult sawflies are 4-6mm long and are black with pale legs.

Identification difficulty
Recording advice

This species has a red ID rating and unless identified by a known expert you must provide a satisfactory explanation of how it was identified for the record to be accepted.


Larvae can be found on the leaves of Oak, Birch, Willow, Lime, Beech and Bilberry.

When to see it

Adults from May to August. The larvae most likely to be found in early autumn.

Life History

The larvae feed on leaves, favouring Oak but also using other species such as Lime.

UK Status

Fairly common in Britain, but under recorded.

VC55 Status

Status in Leicestershire and Rutland not known.

Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map