Cerodontha (Dizygomyza) morosa (Meigen)

Lonsdale, Owen, 2021, Manual of North American Agromyzidae (Diptera, Schizophora), with revision of the fauna of the " Delmarva " states, ZooKeys 1051, pp. 1-481 : 1

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Cerodontha (Dizygomyza) morosa (Meigen)


Cerodontha (Dizygomyza) morosa (Meigen)

Figs 105 View Figures 99–106 , 529-534 View Figures 529–534

Agromyza morosa Meigen, 1830: 170. Becker 1902: 338.

Agromyza hyalipennis Meigen, 1838: 397. Schiner 1864: 306; Becker 1902: 338. Nowakowski 1973 [synonymy?].

Agromyza grossicornis Zetterstedt, 1860: 6456. Strobl 1893: 135, 1894: 141. Nowakowski 1973 [synonymy?].

Dizygomyza morosa . Hendel 1920: 132.

Dizygomyza (Dizygomyza) morosa . Hendel 1931: 90.

Phytobia (Dizygomyza) morosa . Frick 1959: 385.

Cerodontha (Dizygomyza) morosa . Nowakowski 1967: 644; Spencer 1969: 121; Spencer and Steyskal 1986b: 102; Papp and Černý 2016: 165; Eiseman and Lonsdale 2018: 44; Eiseman et al. 2021: 22.


(Fig. 105 View Figures 99–106 ). Wing length 2.3-2.8 mm (♂), 2.4-2.8 mm (♀). Length of ultimate section of vein M4 divided by penultimate section: 1.2-1.4. Eye height divided by gena height: 5.4-11.8. Male first flagellomere much enlarged, circular or slightly higher than long, and covered with long, whitish hairs that end before base; female first flagellomere not enlarged as for male, but with slightly longer whitish hairs anteromedially. Arista slightly thickened on basal 1/4-1/3. Fronto-orbital plate weakly visible laterally, most prominent anteriorly, widest medially, not more than 1/5 width of frons. Lunule large, broadly semi-circular with lateral margin meeting fronto-orbital plate; slightly narrower in female. Posterior ocelli slightly displaced.

Chaetotaxy: Two ori (anterior seta slightly shorter to 2/3 length posterior ori); two ors. Orbital setulae erect to reclinate, in one sparse row. Postocellar and ocellar setae subequal to fronto-orbital setae, but fronto-orbitals sometimes reduced to 1/2 of normal length. Four dorsocentral setae varying in length, sometimes only slightly decreasing in length anteriorly, but anterior seta as small as 1/3 length posterior seta.

Colouration: Setae dark brown. Antenna brown to dark brown with first flagellomere darker; pedicel and scape dark brown in female; frons brown to dirty yellowish brown with greyish pruinosity; fronto-orbital plate dark brown, but sometimes brown (not yellowish) with darker pigment reduced to posterolateral vestige; ocellar triangle dark brown, slightly larger than tubercle, confluent with dark brown margin along back of head; dark brown spot in posterolateral corner of frons reaching base of inner vertical seta; slightly paler triangular region bordering ocellar triangle; lunule smooth, velvety greyish; clypeus, venter of gena and face dark brown; gena and frons between triangle and fronto-orbital plates with minute brown pits. Thorax dark brown with notopleuron and postpronotum slightly paler brown with posterolateral corners sometimes yellowish to yellow; with greyish pruinosity that is strong on notum and dorsally on pleuron. Calypter margin and hairs yellowish white. Wing veins brown, yellowish white from base to basal cells. Halter yellow. Legs dark brown with apex of fore femur light yellow for length equal to width of femur; apices of mid and hind femora varying from slightly yellowish to broadly light yellow as seen on fore leg.

Genitalia: (Figs 529-534 View Figures 529–534 ) Epandrium with strong process above anus that is constricted basally. Subepandrial sclerite with transverse dorsal bar that is broken medially and with one pair of setae; ventral lobe long, dark, relatively straight and with minute outer-apical point. Surstylus fused to epandrium, directed inwards, with double row of many long tubercle-like setae. Phallophorus dorsally fused to dorsomedial plate of mesophallus. Mesophallus medially split into curved, pointed arms, with right lateral arm elongate and mirroring left sclerite of hypophallus. Left sclerite of hypophallus dark, rod-like and with outer carina that can be pronounced or much reduced; right sclerite apparently absent. Paraphallus clear, lobate. Mesophallus and distiphallus narrow, elongate, and dark. Mesophallus with slight apical swelling. Distiphallus divided into one pair of subparallel S-shaped tubules; basal curve very small, shallow; apical curve longer than mesophallus, sometimes recurved apically (curve less pronounced in smaller specimens) and with middle slightly to more obviously flattened/straightened. Ejaculatory apodeme relatively dark, with stem expanding into broad blade that is slightly clearer marginally; base of sperm pump and base of duct pigmented.


Cyperaceae - Carex .


Canada: NB*, ON*, QC* [previous records considered magnicornis ( Spencer and Steyskal 1986b)]. USA: CA, DE*, MA, MO, NC*, OH*, OK (tentatively identified females; Eiseman et al. 2021), PA*, TN*, VA*, WV*; records from IL, IN, MD, MI and SD ( Frick 1959; Priest et al. 2020) require verification. Europe, Canary Islands, China, Japan, North Korea, Russia, India, Philippines ( Papp and Černý 2016).

Type material.

Holotype [morosa]: Germany. [not given] (1♂, NMW). [Not examined]

Holotype [ Agromyza grossicornis ]: Sweden. Lappland, 13.viii.1855 (1♂, ZIL). [Not examined]

Holotype [ Agromyza hyalipennis ]: Germany. Stollberg, Sachsen, coll. Meigen (1♂, MNHN). [Not examined]

Material examined.

Canada. NB: Kent Co., Sainte-Anne-de-Kent, 46°34'N, 64°47'W, 28-29.vii.2013, O. Lonsdale, CNC480850 (1♀, CNC), ON: Normandale, 42°42'N, 80°19'W, 22.v.1956, J.R. Vockeroth, CNC480868, CNC480869 (1♂ 1♀, CNC), 24.v.1956, CNC480870 (1♀, CNC), 27.v.1956, CNC480867 (1♂, CNC), Ottawa, Dow’s Swamp, 3.vi.1958, L. Smith, CNC480865 (1♀, CNC), Ottawa, 19.vi.1954, W.R.M. Mason, CNC480866 (1 ex, CNC), 19.vii.1954, CNC480858 (1♂, CNC), 26.vii.1959, J.R. Vockeroth, CNC480862 (1♂, CNC), 30.v.1958, CNC480864 (1♀, CNC), 31.v.1959, CNC480860 (1♂, CNC), 9.vi.1958, CNC480861, CNC480863 (1♂ 1♀, CNC), 8.vii.1952, G.E. Shewell, CNC480859 (1♂, CNC), QC: Old Chelsea, summit of King Mt. , 350 m, 21.vi.1959, J.R. Vockeroth, CNC480857 (1♀, CNC), Old Chelsea, 11.viii.1959, C.H. Mann, CNC480855 (1♂, CNC), 13.ix.1956, J.R. Vockeroth, CNC480854 (1♂, CNC), 16.ix.1958, CNC480856 (1♀, CNC), sweeping, Pedicularis canadensis L., 14.v.1987, J.R. Vockeroth, CNC480851 (1♂, CNC), Perkins Mills, 25.viii.1949, G.E. Shewell, CNC480853 (1♀, CNC) GoogleMaps . USA. DE: New Castle Co., Newark , Rittenhouse , 6.ix.2003, K. Bennett, sweeping (1♀, UDCC), MA: Berkshire Co. , Lenox , Mahanna Cobble , 23.vi.2016, C.S. Eiseman, Carex gracillima em. 28.vi.2016, #CSE2644, CNC634778 (1♂, CNC), Berkshire Co. , Lenox , Mahanna Cobble , 23.vi.2016, C.S. Eiseman, Carex hitchcockiana , em. 30.vi-4.vii.2016, #CSE2678, CNC654235, CNC654236 (1♂ 1♀, CNC), MD: Lavale , 9.v.1970, G. Steyskal (3♂, USNM), Montgomery Co. , Bethseda , 5.v.1968, L.V. Knutson (1♂, USNM), 9.iv.1968, G. Steyskal (5♂, USNM), 13.iv.1968, G. Steyskal (1♂, USNM), Colesville , 11.vii.1974, W.W. Wirth (1♂, USNM), NC: Grt. Sm. Mt. Nat. Park , Clingman's Dome , 6.viii.1957, C.J. Durden, CNC480830, CNC480844-480849 (5♂ 2♀, CNC), Highlands , 14.vii.1957, W.R. Richards, CNC480843 (1♀, CNC), OH: Hancock Co. , Rocky Ford River , 41°06.7'N, 83°45.6'W, 21.ix.1976, B.A. Steinly (1♂, USNM), PA: Allegheny Co. , nr. Clairton, 4.vii.1997, C.R. Bartlett, sweeping (1♀, UDCC), Chester Co. , Avondale, Stroud Water Rsch. Ctr., 15.ix.2000, A.L. Park, sweep net (2♀, UDCC), TN: Gr. Sm. Mt. Nat. Park , Collins Gap, 1737 m, 22.viii.1957, J.G. Chillcott, CNC480842 (1♀, CNC), Gr. Sm. Mt. Nat. Park , Indian Gap to Clingman’s Dome, 1584-2011 m, 6.viii.1957, J.G. Chillcott, CNC480829, CNC480832-480840 (8♂ 2♀, CNC), 6.viii.1957, CNC480841 (1♂, CNC), VA: Giles Co. , Mountain Lake , 1158 m, sedge meadows, 31.v.1962, J.G. Chillcott, CNC480852 (1♂, CNC), Great Smoky Mt. N.P., NC Tenn., Indian Gap, 1584 m, 23.v.1957, W.R.M. Mason, CNC480831 (1♂, CNC), Giles Co. , Mountain Lake Biol. Stn. , 37°22'31"N, 80°31'18"W, 24.v.2001, O. Lonsdale (1♀, DEBU), Giles Co. , Mountain Lake , 7.ix.1976, G.C. Steyskal (2♂, USNM), Northampton Co., Kiptopeke, 4-6.x.1986, W.E. Steiner et al., Malaise trap, dunes between cliff and beach (1♂, USNM), Chain Bridge, 20.iv.1924, J.R. Malloch (1♂, USNM), WV: White Sulfur Springs, 16.vi.1970, G. Steyskal (1♂, USNM) GoogleMaps .

Tentatively identified material.

USA. OK: Payne Co., Marena , 28.v.2016, em. 8-13.vi.2016, M.W. Palmer, ex Carex festucacea , #CSE2568, CNC634779 (1♀, CNC), Mehan, 36.014339°N, 96.996744°W, 6.v.2016, em. 8.v.2016, M.W. Palmer, ex Carex festucacea , #CSE2665, CNC634805 (1♀, CNC) GoogleMaps .














Cerodontha (Dizygomyza) morosa (Meigen)

Lonsdale, Owen 2021

Agromyza grossicornis

Zetterstedt 1860

Agromyza hyalipennis

Meigen 1838

Agromyza morosa

Meigen 1830