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| Calycomyza
humeralis (von Roser, 1840) [Diptera: Agromyzidae] |
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Agromyza
humeralis
von Roser, 1840. CorrespBl. würt. landw, Ver. Stuttg.
(N.S.) 17(1): 63 |
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Leaf-miner: A short linear mine in first instar, later producing a circular or oval blotch. Frass is excreted in a black mass prior to pupation; puparium firmly glued with frass within the mine (Spencer, 1976: 306). Large, whitish, upper-surface blotch, preceded by a short corridor that often is overrun later by the developing blotch. The larva hardly produces any frass; the few grains that are present are black and rather coarse. But when the larva is about to pupate, it empties its intestine, which has the effect that the puparium is anchored in the mine by dried frass (Bladmineerders van Europa). The initial gallery by the first instar larva then leads to a whitish blotch. The puparium is fixed to the inside of the mine by an accumulation of frass (British leafminers). 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. The larvae was described by de Meijere (1925) and Sasakawa (1961). 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). Reddish-brown to black; posterior spiracles each with 9 minute elongate bulbs (Spencer, 1976: 306). Comments: Erigeron acer is treated as Erigeron acris (Blue Fleabane) and Erigeron acer is treated as Erigeron acris (Blue Fleabane) by Stace (2010). Hosts in Great Britain and Ireland:
Hosts elsewhere: Time of year - mines: June-July. Time of year - adults: Currently unknown. Distribution in Great Britain and Ireland: Widespread in southern England including Kent (Faversham), Oxford (Oxford, Parks), Dunbartonshire (Bonhill), Suffolk (Flatford), Essex (Walton-on-the-Naze) (Spencer, 1972b: 46) and Warwickshire (Hartshill) (Robbins, 1991: 113). Distribution elsewhere: Widespread in continental Europe including Denmark, Finland, Norway, Sweden (Spencer, 1976: 302), The Netherlands (Bladmineerders van Europa), Belgium (de Bruyn and von Tschirnhaus, 1991), Germany (Spencer, 1976: 562), Albania, Corsica, Czech Republic, European Turkey, French mainland, Hungary, Italian mainland, Romania, Slovakia, Spanish mainland, Switzerland and Yugoslavia (Fauna Europaea). Also recorded in Canada (Spencer, 1969a: 149), Argentina, South Africa, India, Australia (Spencer, 1976: 306) and Papua New Guinea (Spencer, 1990). NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere:
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| Last updated 09-Jul-2019 Brian Pitkin |  |
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