Calycomyza gigantea (Frick)

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

Calycomyza gigantea (Frick)

Figs 464 , 465

Agromyza platyptera . Misidentification, in part. Malloch 1913: 293.

Phytobia (Calycomyza) gigantea Frick, 1956: 296.

Calycomyza gigantea . Spencer 1969: 149; Spencer and Steyskal 1986b: 145.

Description.

Wing length 3.1-3.2 mm (♂), 2.9-3.3 mm (♀). Length of ultimate section of vein M4 divided by penultimate section: 2.3-2.5. Eye height divided by gena height: 3.4-4.1. First flagellomere circular. Notum with relatively dense greyish pruinosity.

Chaetotaxy: Three or four ori, with anterior seta sometimes smaller; two ors. Postocellar and ocellar setae well-developed. Six closely spaced dorsocentrals, two presutural, decreasing in size anteriorly. Acrostichal setulae usually in five to six irregular rows; relatively long and sparse. Two posteromedial setae on mid tibia.

Colouration: Setae dark brown. Head yellow with back of head, clypeus, palpus, ventral margin of gena, ocellar triangle (slightly larger than tubercle with corners rounded) and antenna dark brown; frons dark brown in posterolateral corner with stripe extending anteriorly to base of anterior ors, with stripe sometimes broadly enclosing both ors and (sometimes) posterior ori and with lateral margin of eye thinly brown, or fronto-orbital plate with variable mottling near bases of ori (fainter anteriorly); dorsomedial section of parafacial sometimes brown; face evenly dark brown or with pigment faded medially and ventrally. Thorax dark brown with postpronotum (excluding dark anteromedial spot confluent with margin), notopleuron (excluding dark elongate sublateral spot) and supra-alar spot yellow. Halter white. Calypter margin and hairs dark brown. Legs dark brown. Abdomen dark brown, tergites 1-5 with narrow yellow band along posterior margin.

Genitalia: (Figs 464 , 465 ) Epandrium and surstylus with dense patch of tubercle-like setae on inner-distal margin. Hypophallus broad and membranous with medial sclerotisation that is divided on basal 1/2 and with short supapical projection. Basiphallus sclerotised dorsally. Paraphallus absent. Mesophallus slightly broader at midpoint and ~ 2.5 × longer than wide. Distiphallus bifid, widest apically, and with inner fringe of hairs concealed within small apical cup; floating medial sclerite minute. Ejaculatory apodeme dark and fan-shaped with sublateral sclerotised band and marginal striations on blade; sperm pump sclerotised ventrally.

Host.

Unknown - swept from Clematis ( Ranunculaceae ) ( Frick 1956).

Distribution.

Canada: ON, QC. USA: MD, IL, CA, NY, VA, WV*.

Type material.

Holotype: USA. MD: Cabin John Bridge, 28.vi.1912, Knab and Malloch (1♂, USNM).

Paratypes examined.

Canada. ON: Bell’s Cor., wild Clematis , 4.vi.1952, J.F. McAlpine, sweeping, No. 6369, CNC391407 (1♀, CNC), Niagra Glen, 15.vi.1926, G.S. Walley, No. 6369, CNC391408 (1♂, CNC), QC: Wakefield, 26.vi.1946, G.S. Walley, No. 6369, CNC391406 (1♀, CNC).

Additional material examined.

Canada. ON: Wellington Co., Guelph , Stone Rd. E, 16.ix.1991, Malaise, R.A. Cannings (1♀, RBCM) . USA. VA: Blacksburg , 2100', 28.v.1962, J.G. Chillcott, CNC391405 (1♀, CNC), WV: Elk Garden, 25.vi.1968, R. and E. Froeschner (1♀, USNM), Logan Co., Island Creek, 2mi N Mountain View, 19.vi.1991, S.M. Clark (1♀, VPIC) .

Comments.

Calycomyza gigantea is an easily diagnosed species, having a large body size, more than four fronto-orbitals, numerous dorsocentral setae that steadily decrease in height anteriorly, a greyish thorax and an elongate bifid distiphallus with a clear basal stalk (normally short or fused in congeners).

Figures

Figures 460 - 465. Calycomyza frickiana Spencer, male genitalia 460 hypandrium and postgonite, ventral 461 phallus, left lateral 462 phallus, ventral 463 C. frickiana, wing 464, 465 C. gigantea (Frick), male holotype genitalia 464 ejaculatory apodeme 465 phallus, ventral.