Leaf-mine: Mine upper-surface, starting a few cm under the tip of the leaf.A corridor first runs upwards, then doubles, widening all the while. The final part takes half the width of the leaf. The complete corridor is c. 6 cm long; except for the last centimetres it is completely filled with frass (Bland, 1996a). Pupation external; the pupa is attached to the rear of the leaf, without a cocoon.

Buhr (1964) describes the mine on Eleocharis as follows: The larva makes in the finest, almost bristle-like culms, descending from a spikelet, an almost full depth corridor in which only here and there a few green stripes remain. Frass very loose, in extremely fine dots of threads (Bladmineerders van Europa).

Larva: Details unknown.

Pupa: Details unknown.

Adult: Not illustrated in UKMoths (check for update). The male genitalia, but not the female genitalia (check for update), are illustrated as Biselachista eleochariella by the Lepidoptera Dissection Group.

Hosts in Britain:

Hosts elsewhere:

Time of year - larvae: May - June (Bladmineerders van Europa).

Time of year - adults: Unknown.

Distribution in Great Britain and Ireland: Britain including Anglesey, Caernarvonshire, Cambridgeshire, Cheshire, East Cornwall, Easterness, Shropshire and Stafford (NBN Gateway, as Biselachista eleochariella - N.B. includes Watsonian Vice Counties having publicly available records that fall within or overlap the vice county border at 10km resolution or better i.e. a record for a vice county may relate to an adjacent vice county - for included datasets see NBN Grid map below).

Also recorded in the Republic of Ireland (Karsholt and van Nieukerken in Fauna Europaea).

NBN Grid map: Note that not all datasets on the NBN Gateway may be available on the map below. If you are an NBN Gateway registered user you can request access for missing datasets via the link 'Open interactive map in new window' below.

Distribution elsewhere: Widespread in continental Europe including Austria, Czech Republic, Danish mainland, Estonia, Finland, French mainland, Germany, Latvia, Lithuania, Norwegian mainland, Romania, Russia - North, Sweden and The Netherlands (Karsholt and van Nieukerken in Fauna Europaea).

NBN interactive distribution map(s) of known host species in Great Britain and Ireland and elsewhere:

Parasitoids in Britain and elsewhere: Unknown.