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.
(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: The larvae of moths have a head capsule and chewing mouthparts with opposable mandibles (see video of a gracillarid larva feeding), six thoracic legs and abdominal legs (see examples).
Pupa: The pupae of moths have visible head appendages, wings and legs which lie in sheaths (see examples).
The adult is not illustrated in UKMoths (check for update). The male
and female genitalia, are illustrated (as Biselachista eleochariella)
by the Lepidoptera Dissection Group.
Comment: As the larva of Elachista eleochariella is now known from Carex nigra and Carex panicea, questions arise as to whether it mines any other Carex species and also whether it feeds on any non- Carex species. Although larvae have been
recorded on Eriophorum angustifolium and Eleocharis palustris, the larvae of Biselachista albidella have been reported from the same foodplants. Because the
adults of the two species are similar macroscopically, further investigation of the biology is needed and in particular whether the larva does occur on these two plants (Heckford and Beavan, 2013, Entomologist’s Gazette 64: 209–215).
Hosts in Great Britain & Ireland:
of year - larvae:
May - June (Bladmineerders van Europa).
of year - adults: Currently unknown.
in Great Britain & Ireland: Britain including Anglesey (VC52),
Caernarvonshire (VC49), Cambridgeshire (VC29), Cheshire (VC58), East Cornwall (VC2), Easterness (VC96),
Shropshire and Stafford (NBN
Gateway, as Biselachista eleochariella).
recorded in the Republic of Ireland (Karsholt and van Nieukerken
in Fauna Europaea). See also Ireland's NBDC interactive map.
NBN Grid Map:
Elachista eleochariella as Bielachista eleochariella
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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 Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: Currently unknown.