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Melanagromyza oligophaga Spencer, 1990 [Diptera: Agromyzidae] Melanagromyza oligophaga Spencer, 1990. Host specialization in World Agromyzidae : 394. Melanagromyza dettmeri Hering, 1933; Spencer, 1966a. Beitr. Ent. 16: 3-60. [Misidentification, in part]. Melanagromyza dettmeri Hering, 1933; Spencer, 1972b. Handbk ident. Br. Ins. X 5(g): 16 (fig. 20), 19, 111, 112. [Misidentification].

Stem borer: Larva an internal stem-borer. Pupation internal (Spencer, 1972b: 19). Larva: Details unknown. Puparium: Posterior spiracular plates adjoining, each with a regular ellipse of 15 bulbs around a strong central horn (Spencer, 1972b: 19). Comments: Spencer (1966a: 21) and Spencer (1972b: 16, 19, 111, 112) misidentifed British specimens of oligophaga as dettmeri, which is only known from Denmark (Spencer, 1990: 394). The adults are virtually indistinguishable from M. dettmeri (known only on Centaurea jacea from Denmark) with the following essential characters: frons not projecting above eye, orbital setulae in 2 rows, those nearest eye margin reclinate, inner row proclinate; eye with distinct pilosity in both male and female; mesonotum normally faintly greenish; squamae pale, margin pale brown, fringe whitish to ochrous; wing length normally about 3 mm (Spencer, 1990: 394). Hosts in Britain: Asteraceae       Achillea millefolium Yarrow Spencer, 1972b: 111 Artemisia vulgaris Mugwort Spencer, 1972b: 111 Centaurea scabiosa Greater Knapweed Spencer, 1972b: 112 Hieracium umbellatum   Spencer, 1972b: 113 Senecio erucifolius Hoary Ragwort Spencer, 1972b: 114 Senecio jacobaea Common Ragwort Spencer, 1972b: 114 Hosts elsewhere: Asteraceae       Achillea millefolium Yarrow Spencer, 1990: 301 Artemisia vulgaris Mugwort Spencer, 1990: 301 Crepis biennis Rough Hawks-beard Spencer, 1990: 259 Hieracium umbellatum   Spencer, 1990: 259 Picris hieracioides Hawkweed Oxtongue Spencer, 1990: 259 Time of year - larvae: Unknown. Time of year - adults: May. Overwinters as puparium. Distribution in Britain: Surrey (Banstead, Betchworth and Walton Heath); Middlesex (Scratch Wood), Cambridge (Chippenham Fen), Derby (Miller's Dale), Denbigh (Wrexham) and Perth (Killin) (Spencer, 1972b: 19 (as dettmeri, see also Spencer, 1990: 394). Distribution elsewhere: Holland, Germany (Spencer, 1990: 394), Belarus, Germany, Latvia and Lithuania (Martinez in Fauna Europaea). Parasitoids: Unknown.

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Last updated 16-Aug-2008  Brian Pitkin