Phytomyza minuscula Goureau,

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: 77

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Phytomyza minuscula Goureau


Phytomyza minuscula Goureau 

( Fig. 194View FIGURES 189–199)

Material examined. VERMONT: Lamoille Co., Stowe , Hell Brook, W of Mountain Rd. , 6.ix.2015, em. 23– 26.ix.2015, C.S. Eiseman, ex Thalictrum pubescens  , #CSE2072, CNC654547–654559View Materials (8♂ 5♀)  ; same collection data, em. 19.iii –23.iv.2016, #CSE2254, CNC654505–654546 (20♂ 22♀).

Hosts. Ranunculaceae  : Aquilegia  L., Thalictrum fendleri Engelm. ex A. Gray, T.  * pubescens Pursh ( Spencer 1981)  . Frick (1959) reported rearing this species from cultivated varieties of Aquilegia  and Thalictrum  as well as from A. formosa Fisch.  ex DC., but some of his records may refer to Phytomyza aquilegivora Spencer (Spencer & Steyskal 1986)  .

Leaf mine. ( Fig. 194View FIGURES 189–199) According to Spencer (1981), an “irregular, upper surface linear mine, with frass in conspicuous black strips.” The mines we observed were greenish-white and became quite wide toward the end, with irregular margins. Frass was in discrete grains for the most part, with some short strips toward the end, and as the mines widened the frass grains ceased to form two distinct rows and became irregularly scattered. The larva exits through a slit in the lower epidermis. There are often several mines per leaflet (Ellis 2017).

Puparium. Compact, oval, shining orange, formed outside the mine, “normally adhering lightly to the leaf until dislodged by wind or rain” ( Spencer 1981).

Distribution. USA: CA, *VT, WA; Europe. Frick (1959) additionally recorded this species from CT, DC, ID, IL, and IN, but some of these records may refer to Phytomyza aquilegivora Spencer (Spencer & Steyskal 1986)  .