Liriomyza equiseti de Meijere

Lonsdale, Owen, 2011, The Liriomyza (Agromyzidae: Schizophora: Diptera) of California 2850, Zootaxa 2850 (1), pp. 1-123 : 43-46

Liriomyza equiseti de Meijere

Figs 88–91

Liriomyza equiseti de Meijere 1924: 124 . Spencer 1972: 58, 1976: 249, 1990: 6.

Liriomyza kenti Spencer 1969: 176 . Syn. Spencer (1990).

Wing length 1.6–1.8mm (♂). Females not examined. Length of ultimate section of vein CuA 1 divided by penultimate section: 1.9–2.3. Eye height divided by gena height: 3.2–3.7. Scutum heavily dusted but not grey. Parafacial and orbital plate distinctly projecting but narrow. Spencer (1969) notes that the first flagellomere of this species (as L. kenti ) is somewhat quadrate in Canadian specimes, but this is not the case in the Californian material examined.

Chaetotaxy: Two ori, two ors. Acrostichal setulae in three sparse irregular rows; two rows in Canadian and European material ( Spencer, 1969, 1972).

Colouration: Calypter margin and hairs grey. Head (including clypeus) light yellow with back of head and ocellar triangle dark brown, and posterolateral corner of frons dark brown to base of outer vertical bristle and light brown to base of inner vertical bristle. Scutum with complete lateral yellow stripe; katatergite yellow; anatergite dark below scutellum, and brown lateral to scutellum with posterodorsal corner yellow. Anepisternum with small brown anteroventral stripe; anepimeron yellow with brown mottling; meron brown with dorsum yellow; katepisternum brown on ventral 2/3 (not including base of bristle). Legs yellow with tibiae, tarsi, and base of coxae brown. Epandrium and dorsum of pregenitalic abdomen brown.

Genitalia: Figs. 88–91 . Surstylus with apical setae and one subapical spine. Swollen apical section of ejaculatory duct broad and short. Paraphallus absent. Hypophallus with broad membranous base and long hairs. Mesophallus tapering apically, fused to distiphallus and with anteroventral margin thin and strongly produced, forming carina. Distiphallus with broad, pale, bowl-like base and long, clear distal tubules that are darker basally; tubules bent dorsally at midpoint, abruptly separated at base and shielded ventrally by short bilobed plate. Ejaculatory apodeme with pileus ejaculatorius broad laterally with margins thickly sclerotized; blade pale with and short with corners pointed and margin with faint striations.

Host. Equisetaceae — Equisetum arvense .

Range. USA. California [Modoc*]. Canada. Alberta, British Columbia. Britain. Netherlands.

Type material. Liriomyza equiseti : Syntypes, NETHERLANDS. Haarlem , “Stengelmine an Equisetum arvense ” (type information unknown) [Not examined]. Liriomyza kenti : Holotype, CANADA. British Columbia: Prince George , 18.vi.1966, K.A. Spencer, Type No. 16128 (1♂, CNC) ; Paratype examined, CANADA. Alberta: Jasper , 19.vi.1966, [illegible], K.A. Spencer (1♂, CNC) .

Additional material examined. USA. California: Modoc Co., 1mi E Pine CR., 13.vi.1970, P.A. Rude (1♂, EMEC) .

Comments. Four Liriomyza species are known to mine horsetails: the European L. occipitalis Hendel and L. virgula Frey (Tschirnhaus, pers. comm.), the European and Canadian L. virgo (Zetterstedt) , and the Nearctic and European L. equiseti , found here for the first time in the United States.

Figures

FIGURES 88–95. Figs 88–91: Liriomyza equiseti Meijere, male genitalia; 88: external components, ventral; 89: ejaculatory apodeme; 90: phallus, ventral; 91: phallus, left lateral. Figs 92–95: L. flavicola Spencer, male holotype genitalia; 92: phallus, right lateral; 93: ejaculatory apodeme; 94: external components, ventral; 95: phallus, left lateral and ventral, from original figure in Spencer (1981).