Phytomyza compta (Spencer)

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

Phytomyza compta (Spencer)

Figs 132 , 763-765

Chromatomyia compta Spencer in Spencer and Steyskal 1986b: 324.

Phytomyza compta . Winkler et al., 2009: 290.

Description

(Fig. 132 ). Wing length 2.9-3.3 mm (♂), 3.0-3.8 mm (♀). Vein dm-m absent. Eye height divided by gena height: 2.7-3.3. Hairs on first flagellomere long, bushy; segment rounded, longer than high, narrowing or wider apically, sometimes appearing subrectangular. Cheek distinct.

Chaetotaxy: Two ori with anterior seta shorter and much thinner (not more than 3/5 length posterior ori), sometimes absent on one side; two ors. Two rows of acrostichal setulae. Four subequal dorsocentral setae. Smaller medial presutural supra-alar present.

Colouration: Overall colour yellow, more faintly greyish on pleuron; greyish pruinosity evident on pigmented regions, densest dorsally on thorax. Lunule, fronto-orbital plate and posterolateral corner of frons light yellow; ocellar tubercle brown medially with extensions to ocelli; frons posterior to postocellar yellow; back of head brown above foramen; first flagellomere black; palpus brown with base variably yellow. Scutum dark brown with postpronotum, notopleuron, anterior margin beside postpronotum to dorsocentral row, lateral and posterolateral margins to corner of scutellum yellow; sometimes with regions anterior to scutellum between dorsocentrals yellowish; if posteromedial region more clearly yellow, then pattern partially vittate, with posterolateral supra-alar stripe partially differentiated and with nearly indistinct yellow line along dorsocentral row, thereby appearing as a more widely infuscated P. clematiphaga . Scutellum yellow with brownish lateral and anteromedial spots. Pleuron yellow with faded brownish anteroventral stripe on anepisternum sometimes evident, meron brown ventrally, katepisternum with large spot not reaching base of seta, and anepimeron sometimes with brownish mottling. Mediotergite dark brown, anatergite brown, katatergite yellow with posteroventral corner brown. Halter white. Calypter white with hairs brown. Tibiae brown to brownish yellow and tarsi brown. Male abdomen yellow; female abdomen brownish dorsally or with reduced pigment medially on tergites 1 and 2 and anteriorly on tergites 3-5; oviscape brown laterally, posteriorly, and sometimes dorsally, but always yellowish or with yellow mottling.

Genitalia: (Figs 763-765 ) Hypandrium short, stout and broadly rounded with narrower, projecting apex; inner lobe with two setae and haired membranous extension. Postgonite broad and relatively flat with one outer seta. Halves of basiphallus narrow, interlocking at base, with dorsal subapical extension nearly reaching paraphallus, and with small, pale ventroapical extension. Hypophallus U-shaped with arms subparallel; basally with tubular membranous chamber with one pair of ill-defined sclerotised strips flanking it where it differentiates into a free, upcurved flagellum. Paraphalli dark, ~ 3 × longer than wide, connected by membrane along venter, covering base of distiphallus; angled dorsally. Ejaculatory duct sclerotised subapically, meeting small, ill-defined, and enclosed mesophallus. Distiphallus entirely split into one pair of diverging tubules ca. as long as hypophallus that are angled towards base of phallus; tubules sclerotised on distal 1/2, but with slightly longer sclerotised ventral extension basally; single rod-like sclerite floating between arms of distiphallus. Ejaculatory apodeme large, clear to blade margin and with venter of sperm pump dark.

Host.

Unknown - possibly Clematis ( Spencer and Steyskal 1986b).

Distribution.

Canada: ON*. USA: ME*, NC, NY*, TN, VA, WA*.

Type material.

Holotype: USA. NC: Swain Co., Great Smoky Mts. N.P., Clingman’s Dome, 6300-6642ft, 20.v.1957, J.R. Vockeroth (1♂, CNC).

Paratypes examined.

USA. NC: Gr. Sm. Mt. Nat. Park, Clingman’s Dome, 6.viii.1957, C.J. Durden, CNC480088 (1♀, CNC), Gr. Sm. Mt. Nat. Park, Tenn., Clingman’s Dome, 2011 m, 22.viii.1957, J.G. Chillcott, CNC480085 (1♂, CNC), 2026 m, 21.v.1965, CNC480089 (1♀, CNC), Gr. Smoky Mt. Nat. Park, Clingman’s Dome, 1920-2024 m, 28.v.1957, J.R. Vockeroth, CNC480092 (1♀, CNC), 20.v.1957, CNC480091 (1♀, CNC), 28.v.1957, CNC480084 (1♂, CNC), Mt. Mitchell, 2072 m, 12.viii.1957, J.G. Chillcott, CNC480083 (1♂, CNC), Mt. Richland-Balsam, Blue Ridge Pkwy, 1828-1950 m, 30.v.1965, J.G. Chillcott, CNC480087 (1♀, CNC), TN: Gr. Smoky Mt. Nat. Pk., Indian Gap, 1584 m, 28.v.1957, J.R. Vockeroth, CNC480090 (1♀, CNC), VA: Hawksbill, Shenandoah N.P., 1097-1234 m, 7.vi.1962, J.R. Vockeroth, CNC480080-480082 (2♂1♀, CNC), Smyth Co., Mt. Rogers, 1615-1737 m, 1.vi.1962, J.R. Vockeroth, CNC480086 (1♂, CNC).

Additional material examined.

Canada. ON: Thornhill , 30.v.1964, J.R. Vockeroth, CNC480079 (1♀, CNC) . USA. ME: Belfast , 16-20.ix.1946, C.W. Sabrosky (1♀, USNM), NY: Slide Mt., 25.viii.1935, 4200', H.K. Townes (1♂ 4♀, USNM), WA: Mt. Rainier, VanTrump Crk., 2.ix.1917, A.L. Melander (1♀, USNM) .

Comments.

Phytomyza compta is a large species with a characteristically pale body (also see comments for P. clematiphaga ). The first flagellomere is also fringed with relatively long hairs and the phallus is unusual: the paraphalli form a single rounded bar, and the two dark arms of the distiphallus are separate from each other and bent posterodorsally. The latter character likely caused this species to be initially classified in the genus Chromatomyia , but it does not appear to be related to any of the other lineages of this synonymized genus.

Figures

Figures 131 - 138. 131 Phytomyza (Napomyza) lateralis Fallen, female and puparium 132 Phytomyza compta (Spencer), male holotype, lateral 133 Phytomyza nervosa Loew, lateral, with detail of proclinate orbital setulae (arrow) 134 Phytomyza crassiseta Zetterstedt, female (D. Cheung - Ontario) 135 Phytomyza sp., female (S. A. Marshall - Hornings Mills) 136 Phytomyza sp., female (B. Dupree - Georgia, Atlanta) 137 Phytomyza sp., female (K. Hall - Washington, Lacey) 138 Phytomyza bicolor Coquillett, female on Caltha palustris (S. A. Marshall - Ontario, Spring Creek).

Figures 760 - 765. Phytomyza clematiphaga Spencer, male genitalia 760 hypandrium and postgonite, ventral 761 hypandrial complex, left lateral 762 phallus, ventral 763 - 765 P. compta (Spencer), male genitalia 763 phallus, left lateral 764 ejaculatory apodeme 765 hypandrium and postgonite, ventral.