Phytomyza winkleri, Lonsdale, 2021

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 winkleri sp. nov.

Figs 828-832

Description.

Wing length 1.8 mm (♂). Female unknown. Vein dm-m absent. Eye height divided by gena height: 3.7. First flagellomere relatively large, 1/3 height of eye, slightly longer than high, hairs along distal margin slightly longer. Ocellar triangle not much larger than tubercle and rounded. Parafacial projecting, slightly narrower than cheek; fronto-orbital plate slightly projecting medially, becoming more pronounced anteriorly.

Chaetotaxy: One ori; two ors; all subequal. Ocellar seta slightly longer than fronto-orbitals, postocellar more so. Few orbital setulae. Four dorsocentrals, one presutural, slightly decreasing in height anteriorly. Acrostichal setulae irregular and few, variably appearing in two to four rows around and slightly posterior to suture. Few intra-alar setulae around suture.

Colouration: Head partially yellow, with antenna black, back of head, ocellar triangle (barely larger than tubercle) and ventral margin of gena dark brown; palpus and clypeus brown; posterolateral corner of frons dark brown to base of inner vertical seta, dark spot continuing anteriorly along fronto-orbital plate to disappear between bases of ors. Thorax dark brown with grey pruinosity that is denser dorsally; pruinosity also seen more thinly across remainder of body, especially along dark lateral regions of frons. Halter white. Calypter margin and hairs brownish. Legs mostly dark brown; coxae brownish, fore coxa dark towards base; apex of femora and bases of tibiae yellow. Abdomen dark brown.

Genitalia: Epandrium shallow, long setose posteriorly, completely fused to small surstylus. Postgonite broad and flat with large distoventral lobe and fused to hypandrium. Dorsal margin of phallophorus fused to single apically split basiphallus. Paraphallus originating slightly beyond apices of basiphallus, converging and becoming more plate-like apically; broken medially. Mesophallus not evident. Distiphallus pale and cylindrical, narrower at base, dark apically and weakly pigmented dorsally. Ejaculatory apodeme with small pale blade and broad base.

Host.

Unknown.

Distribution.

USA: MD.

Etymology.

The specific epithet recognises the collector of the holotype, I. Winkler, who provided the specimen to the author after recognising it to be an undescribed species.

Type material.

Holotype: USA. MD: Montgomery Co., Pautuxent State Park, below Brighton dam, W. of Columbia, 39°11.39'N, 77°0.29'W, 8.v.2005 IS Winkler (1♂, USNM).

Comments.

The phallus of Phytomyza winkleri superficially suggests a close association to species of the subgenus Napomyza , but unlike many members of this subgenus, vein dm-m is absent, making it more similar in appearance to other Phytomyza s. s. While its position within the genus is still unclear, a relationship to P. avicursa is suggested in the structure of the hypandrial complex, mostly in the dorsal position of the split basiphallus and the long perpendicular paraphallus. Both are further characterised by a dark, grey pruinose notum, dark legs with yellowish knees, a black antenna with the first flagellomere relatively large and one ori (two present on one side in the P. avicursa type).

Figures

Figures 828 - 832. Phytomyza winkleri sp. nov., male genitalia 828 external genitalia, left lateral 829 hypandrium and postgonite, left lateral 830 ejaculatory apodeme 831 phallus left lateral 832 phallus, ventral.

Figures 24 - 36. Phytomyza chelonei Spencer, larva 24 lateral 25 same, anteroventral 26 - 28 Phytomyza misella Spencer, puparium 26 lateral 27 same, anterior 28 same, posterior 29 - 31 cephalopharyngeal skeleton, lateral 29 Agromyza anthracina Meigen 30 Liriomyza pusilla (Meigen) 31 Phytomyza horticola Goureau 32, 33 puparium, anterior end, dorsal 32 Phytomyza milii Kaltenbach 33 Tropicomyia theae (Cotes) 34 - 36 posterior spiracles 34 Agromyza albipennis Meigen 35 Melanagromyza lappae Loew 36 Phytomyza ranunculi (Schrank). Figs 29 - 36 reproduced from Dempewolf (2001).