Leaf-mine: The mine begins as a small upper-surface blotch, from which corridors
radiate. Wile these become longer and more numerous a secondary
blotch develops. Frass in pearl strings. Pupation within the mine
(Bladmineerders van Europa).
Larva: The larvae of flies are leg-less maggots without a head capsule (see examples). They never have thoracic or abdominal legs. They do not have chewing mouthparts, although they do have a characteristic cephalo-pharyngeal skeleton (see examples), usually visible internally through the body wall.
Posterior spiracles with 8-9 bulbs. The larva is illustrated in Bladmineerders van Europa.
Puparium: The puparia of flies are formed within the hardened last larval skin or puparium and as a result sheaths enclosing head appendages, wings and legs are not visible externally (see examples).
Spencer (1972b: 95) recorded
Chromatomyia gentianae (as Phytomyza) on Blackstonia
perfoliata and Centaurium
erythrae (as minus). However, he later (Spencer,
1990: 396-7) recognised that specimens on Blackstonia
perfoliata and specimens on Centaurium
erythrae represented two different new species, which he described
blackstoniae and Chromatomyia
Hosts in Great Britain & Ireland: Currently unknown.
of year - mines:
July and August-September (Bladmineerders van Europa).
of year - adults: Currently unknown.
in Great Britain & Ireland: Currently unknown.
elsewhere: All confirmed records so far are from the mountains
of central Europe (Spencer, 1990). Also recorded in The Netherlands
(Bladmineerders van Europa), Austria, Bulgaria, Czech Republic, French mainland,
Germany, Italian mainland, Lithuania, Poland, Slovakia, Spanish
mainland, Switzerland and The Netherlands (Martinez in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: