Agromyza rudbeckiana Scheffer & Lonsdale,

Eiseman, Charles S. & Lonsdale, Owen, 2018, New state and host records for Agromyzidae (Diptera) in the United States, with the description of thirty new species, Zootaxa 4479 (1), pp. 1-156: 13

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Agromyza rudbeckiana Scheffer & Lonsdale


Agromyza rudbeckiana Scheffer & Lonsdale 

( Figs. 76–77View FIGURES 75–82)

Material examined. IOWA: Winneshiek Co., 43°26'32.50"N, 92°0'10.32"W, 17.vii.2015, em. 13.viii.2015, C.S. Eiseman, ex Heliopsis helianthoides  , #CSE1995, CNC564707View Materials, CNC564708View Materials (2♂)GoogleMaps  ; MASSACHUSETTS: Franklin Co., Northfield, 276 Old Wendell Rd. , 18.vii.2016, em. 5–7.viii.2016, C.S. Eiseman, ex Heliopsis helianthoides  , #CSE2846, CNC654189–654193View Materials (1♂ 4♀)  ; OHIO: Delaware Co., Sunbury, Monkey Hollow Rd. , 20.vii.2015, em. 7–17.viii.2015, C.S. Eiseman, ex Heliopsis helianthoides  , #CSE1972, CNC564733–564745View Materials (3♂ 9♀ 1 unemerged from puparium). 

Hosts. Asteraceae  : * Heliopsis helianthoides  (L.) Sweet, Rudbeckia  L. ( Scheffer & Lonsdale 2018). The “undetermined yellow-flowered composite” illustrated by Scheffer & Lonsdale appears to be Heliopsis helianthoides  .

Leaf mine. ( Figs. 76–77View FIGURES 75–82) Greenish, turning brown; a blotch mine that may be compact or narrow and elongate, in the latter case following the leaf margin; frass diffuse. Scheffer & Lonsdale (2018) stated that the mine starts at the leaf apex, but this is not always the case. Up to four white larvae may feed in a single mine.

Puparium. Brown; formed outside the mine.

Distribution. USA: *IA, *MA, NY, *OH, VT ( Scheffer & Lonsdale 2018).

Comments. Scheffer & Lonsdale (2018) collected larvae from Rudbeckia  in June and adults emerged after overwintering. All of our specimens were collected as larvae in July and adults emerged within a month. Larvae from all three collection sites were observed to exit their original mines and establish new ones elsewhere ( Fig. 77View FIGURES 75–82). The ability to do so is common in other leaf-mining flies ( Anthomyiidae  , Drosophilidae  , Ephydridae  ), but in five years of rearing we have observed it in Agromyzidae  on just one other occasion. This was on Hackelia virginiana  (L.) I.M. Johnst. ( Boraginaceae  ) in Dutchess Co., New York on 22 June 2013; unfortunately we were unable to rear adults. Phytomyza ovalis Griffiths  is the only agromyzid recorded from Hackelia  , but it is not known to occur east of Colorado. A group of Agromyza  species is associated with Boraginaceae  and the New York Hackelia  feeder may be one of these.