Nemorimyza posticata (Meigen)

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: 62-63

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Nemorimyza posticata (Meigen)


Nemorimyza posticata (Meigen)  

( Figs. 167–168 View FIGURES 165–170 )

Material examined. FLORIDA: Highlands Co., Sebring , Highlands Hammock State Park , 29.iii.2013, em. 30.iv.2013, C.S. Eiseman, ex Elephantopus elatus   , #CSE395, CNC422917–422919 View Materials (2♀ 1 puparium)   ; IOWA: Winneshiek Co., Cresco, Cold Water Creek Rd   ., 43°25'55.97"N, 92°00'34.78"W, 16.vii.2015, em. 5.viii.2015, C.S. Eiseman, ex Solidago gigantea   , #CSE1962, CNC564703 (1♀); MAINE: Hancock Co., Penobscot, Battle Island ,, em. 10.vii.2012, C.S. Eiseman, ex Solidago sempervirens   (1♂)   ; MASSACHUSETTS: Berkshire Co., Lenox, Mahanna Cobble , 12.vii.2016, em. 2.viii.2016, C.S. Eiseman, ex Euthamia graminifolia, #CSE2836, CNC654234 View Materials (1♂)   ; Franklin Co., Northfield, 276 Old Wendell Rd. , 30.ix.2013, em. 26.iii –1.iv.2014, C.S. Eiseman, ex Euthamia graminifolia, #CSE1027, CNC384779 View Materials , CNC384780 View Materials (1♂ 1♀)   ; 11.x.2013, em. 27.iii.2014, C.S. Eiseman, ex Solidago canadensis var. hargeri   , #CSE1032, CNC384732 (1♂); 2.vii.2016, em. 25.vii.2016, C.S. Eiseman, ex Euthamia graminifolia, #CSE2808, CNC659964 (1♂); Northfield, Crag Mountain , 16.x.2013, em. 29–31.iii.2014, C.S. Eiseman, ex Oclemena acuminata, #CSE1039, CNC384754–384757 View Materials (3♂ 1♀)   ; Northfield , 42.650397, -72.432021, 23.viii.2016, em. 1.v.2017, C.S. Eiseman, ex Doellingeria umbellata   , #CSE3607, CNC939723 View Materials (1♂)   ; Hampshire Co., Northampton, Mineral Hills , 28.ix.2013, em. 27.iii.2014, C.S. Eiseman, ex Symphyotrichum puniceum   , #CSE1031, CNC384792 View Materials (1♀)   ; Northampton, bikeway west of King St. , 13.ix.2013, em. 29.iii.2014, C.S. Eiseman, ex Symphyotrichum cordifolium   , #CSE1041, CNC384734 View Materials (1♀)   ; Nantucket Co., Nantucket, Dead Horse Valley , 6.viii.2012, em. 26.viii.2012, C.S. Eiseman, ex Solidago altissima   , #CSE45, CNC480533 View Materials (1♂)   ; Nantucket, Ice Pond Lot, 5.viii.2012, em. 26.viii.2012, C.S. Eiseman, ex Baccharis halimifolia   , #CSE46, CNC480534 (1♀); Nantucket , UMass field station,, em. 2.vii.2013, C.S. Eiseman, ex Solidago altissima   , #CSE641, CNC384796 View Materials (1♀)   ; Nantucket, Squam Swamp,, em. 3.vii.2013, C.S. Eiseman, ex Solidago latissimifolia   , #CSE646, CNC392660 (1♂); MISSOURI: Franklin Co., Gray Summit, Shaw Nature Reserve , 1.vii.2015, em. 27.vii.2015, C.S. Eiseman, ex Helianthus   ?hirsutus, #CSE1869, CNC564677 View Materials (1♂)   ; NEW YORK: Essex Co., Upper Jay, near Bartlett Rd. ,, em. by 1.vii.2012, C.S. Eiseman, ex Solidago basal leaf (1♂)   ; NORTH CAROLINA: Scotland Co., Laurinburg, St. Andrews University , 15.v.2015, em., T.S. Feldman, ex Solidago, #CSE1592, CNC564670 View Materials (1♂)   ; OHIO: Adams Co., West Union, Eulett Center (4274 Waggoner Riffle Road ), 30.vii.2016, em. 19.viii.2016, C.S. Eiseman, ex Vernonia   , #CSE2917, CNC654484 View Materials , CNC654485 View Materials (2♀)   ; Delaware Co., Sunbury, Monkey Hollow Rd. , 2.viii.2016, em. 24.viii.2016, C.S. Eiseman, ex Teucrium canadense   , #CSE2934, CNC638881 View Materials (1♂)   ; Franklin Co., Columbus, 273 Highfield Drive , 27.viii.2017, em. 6.v.2018, C.S. Eiseman, ex Vernonia gigantea   , #CSE4501   ; OKLAHOMA: Payne Co., Mehan , 36.014339° N, 96.996744° W, 24.viii.2015, em. 14.ix.2015, M.W. Palmer, ex Elephantopus carolinianus   , #CSE2056, CNC654005 View Materials (1♂) GoogleMaps   ; 13.x.2015, em. 11.iv.2016, M.W. Palmer, ex Elephantopus carolinianus   , #CSE2363, CNC653989 (1♂); 18.viii.2017, em. 13.ix.2017, M.W. Palmer, ex Vernonia baldwinii   , #CSE4258, CNC939891 (1♀); TENNESSEE: Davidson Co., Oak Hill, Radnor Lake , 22.viii.2017, em. 19–23.ix.2017, C.S. Eiseman, ex Polymnia canadensis   , #CSE4291, CNC939947–939956 View Materials (4♂ 6♀)   ; TEXAS: Edwards Co., 1.3 miles NW of Campwood , 16.iii.2017, em. 30.iv.2017, C.S. Eiseman, ex Verbesina virginica   , #CSE3600, CNC941261 View Materials (1♀).  

Hosts. Asteraceae   : Baccharis halimifolia   L., Doellingeria umbellata (Mill.) Nees   , * Elephantopus carolinianus Raeusch.   , E. elatus Bertol.   , * Euthamia graminifolia (L.) Nutt., * Helianthus   L., * Oclemena acuminata (Michx.) Greene, * Polymnia canadensis   L., Solidago * altissima L.   , S. bicolor   L., S. caesia   L., S. canadensis   L., S. flexicaulis   L., S. gigantea Aiton   , S. juncea Aiton, S.   * latissimifolia Mill.   , S. nemoralis Aiton, S.   * sempervirens L.   , S. tortifolia Elliott, Symphyotrichum   * cordifolium   (L.) G.L. Nesom, S. laeve   (L.) Á. Löve & D. Löve, S. lanceolatum (Willd.) G.L. Nesom   (as Aster ramosissimus Torr. & A. Gray), S. novae-angliae (L.) G.L. Nesom, S. * puniceum   (L.) Á. Löve & D. Löve, S. undulatum   (L.) G.L. Nesom, * Verbesina virginica   L., * Vernonia baldwinii Torr., V.   * gigantea (Walter) Trel.   ; * Lamiaceae   : Teucrium canadense   L. ( Frick 1959; Spencer & Stegmaier 1973; Mlynarek et al. 2016). The origin of the Erechtites hieraciifolius   (L.) Raf. ex DC. record listed by Spencer & Steyskal (1986) is unclear. Spencer (1981) listed Erechtites   among the known hosts of Nemorimyza posticata   , but this appears to be its first appearance in the literature. We have examined E. hieraciifolius   plants in multiple locations but have only found mines of N. maculosa (Malloch)   and Phyllocnistis insignis (Frey & Boll)   ( Lepidoptera   , Gracillariidae   ). We have seen probable mines of N. posticata   on Baccharis pilularis   DC., Elephantopus tomentosus   L., and Eurybia divaricata (L.) G.L. Nesom.

Leaf mine. ( Figs. 167–168 View FIGURES 165–170 ) A large, upper surface blotch mine with conspicuous feeding lines ( Spencer & Steyskal 1986; Fig. 168 View FIGURES 165–170 ), although these are not always obvious in reflected light. Brown, liquidy frass is typically smeared throughout, but in mines on Symphyotrichum it tends to be concentrated centrally, leaving clean, pale green margins ( Fig. 167 View FIGURES 165–170 ). In our experience the mine is virtually always initially trumpet-shaped, proceeding distally along the leaf margin. One mine was formed at the tip of a Solidago leaf and resembled the mines from which we have reared Nemorimyza maculosa   on other hosts (as in Fig. 166 View FIGURES 165–170 ). Most mines on Euthamia were similar and they occupied the entire leaf when complete.

Puparium. Brown, formed outside the mine.

Distribution. Widespread in the US and Canada; Costa Rica; Venezuela ( Martinez & Etienne 2002); Europe; Japan.

Comments. Only females were reared from the mines on Elephantopus elatus   , but the blotches had the characteristic feeding lines of N. posticata   and were initially trumpet-shaped, proceeding distally along the leaf margin, as with the mines on other hosts from which we have reared N. posticata   . Up to three mines were found per leaf, and one large blotch contained two larvae, but because they were radically different in size we presume that this was the result of two separate mines merging.


University of Iowa, Museum of Natural History


University of Maine


University of Newcastle