Liriomyza chemsaki Spencer

Lonsdale, Owen, 2011, The Liriomyza (Agromyzidae: Schizophora: Diptera) of California 2850, Zootaxa 2850 (1), pp. 1-123 : 40-41

Liriomyza chemsaki Spencer

Figs 76–79

Liriomyza chemsaki Spencer 1981: 226 . Spencer & Steyskal 1986: 133. Wing length 2.1mm (♂). Female unknown. Length of ultimate section of vein CuA 1 divided by penultimate section: 2.1. Eye height divided by gena height: 1.8. Scutum dusted/matt. Parafacial and orbital plate projecting with cheek distinct. Epistoma large.

Chaetotaxy: Three ori, two ors. Acrostichal setulae in four rows.

Colouration: Calypter margin and hairs grey. Head light yellow with ocellar tubercle, back of head and clypeus dark brown; posterolateral region of frons dark brown to base of outer vertical bristle and light brown to base of inner vertical, and posterodorsal margin of eye dark brown with stripe extending to base of inner vertical. Scutum dark with complete lateral yellow stripe; katatergite yellow and anatergite brown, with section below scutellum darker and section lateral to scutellum yellowish posterodorsally. Pleuron mostly yellow with meron extensively mottled, anepisternum with thick diagonal stripe (tapered posteriorly), ventral 2/3 of meron brown and ventral ¾ of katepisternum (excluding base of bristle) brown. Legs dark brown with distal 1/3 of coxae yellow, tarsi paler to base, and apex, distoventral surface and lateral streaking on femora yellow. Abdomen colour unknown.

Genitalia: Figs 76–79 . Surstylus with small subapical spine. Paraphallus long and thin. Hypophallus with short apical hairs. Mesophallus thinner than end of ejaculatory duct, narrowing apically and fused to distiphallus. Distiphallus with broad bowl-like base and with one pair of weakly-sclerotized, elongate, posteriorly-curved apical projections. Ejaculatory apodeme with relatively long, narrow stem and semi-circular blade; pileus ejaculatorius heavily-sclerotized and irregular laterally; base of duct sclerotized.

Host. Unknown.

Range. USA. California [Trinity].

Type material. Holotype, USA. California: Trinity Co., Buttercreek Meadow , 21.v.1973, flight trap, J.A. Chemsak, Type No. 14060 (1♂, CASC).

Comments. Liriomyza chemsaki is diagnosed by predominantly dark legs, a matt scutum, a mostly pale anepisternum, and an unusual head with a relatively high gena, a large epistoma, a projecting parafacial and orbital plate, and five pairs of fronto-orbitals. The phallus is unusual, similar to that of the cloudy-winged L. nebulosa , but much shorter.

Figures

FIGURES 76–81. Figs 76–79: Liriomyza chemsaki Spencer, male holotype genitalia; 76: phallus, left lateral; 77: phallus, ventral, from original figure in Spencer (1981); 78: ejaculatory apodeme; 79: external components, ventral. Figs 80–81: L. smilacinae Spencer (half size relative to L. chemsaki illustration); 80: ejaculatory apodeme; 81: phallus, lateroventral.