and case-bearer: The larva initially feeds inside a seed capsule. The case is made
by the final instar larva and is decorated with frass and vegetable
material. It also has characteristic 'gussets', which allow for
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).
At the larval stage caespititiella can be distinguished from other Juncus
feeders by its grey case heavily encrusted with blackish frass and
debris, with paler longitudinal expansion grooves (UKMoths).
Pupa: The pupae of moths have visible head appendages, wings and legs which lie in sheaths (see examples).
The adult is illustrated in UKMoths by Nigel Whinney.
genitalia are illustrated by the Lepidoptera Dissection Group.
Until 1955, and sometimes later, the name of this species was incorrectly
given to the ubiquitous rush feeder, C. alticolella (UKMoths).
Hosts in Great Britain & Ireland:
elsewhere: Currently unknown.
of year - larvae: In August it lives, without a case, concealed
in a rush seed. In September it feeds on Juncus seeds from its case,
4 to 5 mm long, often hidden in the seedhead. In late September
or October the full fed larva either leaves the foodplant or hides
itself in the seedhead for the winter (UKMoths).
Most larvae are fully fed late September/early October and then
of year - adults: Mid May to June at dusk and night (UKMoths);
August to May (British
in Great Britain & Ireland: Widespread and locally common
in England, but less so in Wales and Scotland (UKMoths)
including Bedfordshire (VC30), Carmarthenshire (VC44), Cheshire (VC58), Cumberland (VC70), East Kent (VC15), East Norfolk (VC27), East Suffolk (VC25), Glamorganshire (VC41), Herefordshire (VC36), Hertfordshire (VC20),
Huntingdonshire (VC31), Kintyre (VC101), Middlesex (VC21), North Somerset (VC6), North Wiltshire (VC7),
Shropshire (VC40), South Hampshire (VC11), South Lancashire (VC59), South Wiltshire (VC8), Staffordshire (VC39),
Surrey (VC17), West Kent (VC16), West Norfolk (VC28), West Suffolk (VC26), Westmorland (VC69) and Worcestershire (VC37) (VC37),
Also Rixton, Warrington, Cheshire (British
leafminers) and Channel Is.
recorded in the Republic of Ireland (Karsholt and van Nieukerken
in Fauna Europaea). See also Ireland's NBDC interactive map.
is widespread and locally common in England, but less so in Wales
and Scotland (UKMoths).
NBN Grid Map:
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elsewhere: Widespread in continental Europe including Austria,
Belgium, Croatia, Czech Republic, Danish mainlan, Estonia, Finland,
French mainland, Germany, Hungary, Italian mainland, Latvia, Liechtenstein,
Lithuania, Luxembourg, Macedonia, Norwegian mainland, Poland, Portuguese
mainland, Romania, Russia - South, Sardinia, Slovakia, Spanish mainland,
Sweden, Switzerland, The Netherlands and Yugoslavia (Karsholt and
van Nieukerken in Fauna Europaea).
recorded in the Near East and Nearctic Region (Karsholt and van
Nieukerken in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: