Liriomyza tricornis, Lonsdale, 2011

Lonsdale, Owen, 2011, The Liriomyza (Agromyzidae: Schizophora: Diptera) of California 2850, Zootaxa 2850 (1), pp. 1-123 : 104

Liriomyza tricornis spec. nov.

Figs 210–213

Wing length 2.1mm (♂). Female unknown. Length of ultimate section of vein CuA 1 divided by penultimate section: 2.5. Eye height divided by gena height: 5.0. Scutum subshining.

Chaetotaxy: Two ori, one ors. Acrostichal setulae in four rows.

Colouration: Calypter margin and hairs dark brown. Head yellow with antenna darker, ventral margin of gena with thin brownish stripe, clypeus, ocellar triangle and back of head dark brown, and posterolateral corner of frons dark brown to base of outer vertical bristle and lighter brown to base of inner vertical bristle. Scutum with complete lateral yellow stripe; laterotergites brown with dorsal 1/3 of katatergite yellow. Pleuron dark brown with dorsal 1/3 of anepisternum and dorsal margin of katepisternum yellow. Coxae dark brown with tip of fore coxa yellow; femora yellow with brown base and dorsal streaking; tibiae and tarsi dark brown. Abdomen dark brown.

Genitalia: Figs 210–213 . Surstylus broadly rounded with several apical setulae and two basal spines in desclerotized region. Paraphallus thin and bar-like. Hypophallus thin with few apical hairs fused to a point. Mesophallus rounded at sides and slightly longer than wide; mesophallus and distiphallus with complete ventral sulcus. Distiphallus cup-shaped, slightly compressed dorsoventrally, with darker base (walls thickest on dorsal and ventral surfaces) and pale hollow distal section enclosing weak hairs. Ejaculatory apodeme with base of duct and pileus ejaculatorius lightly-sclerotized; stem thin past base and blade broad and subovate with marginal streaking.

Etymology. The specific epithet denotes the three (L. tri -) pairs of fronto-orbitals ( L. cornu ) on the frons.

Host. Unknown.

Range. USA. California [San Mateo].

Type material. Holotype, USA. California: San Mateo Co., South San Francisco, 326 Alta Loma Drive , 1– 25.i.2007, 30m, 37°39’39.8”N, 122°26’36.0”W, P.H. & M.M. Arnaud, Jr., & M.L. Tarbox, Arnaud Malaise trap (1♂, USNM).

Comments. Liriomyza tricornis differs subtly from similar species in having only three pairs of fronto-orbitals on both sides of the frons. The surstylus is also unique in having two spines in a desclerotized basal region (not the sclerotized apical region), the hypophallus is thin and pointed, and the left distolateral lobe on the basiphallus is sclerotized, resembling the paraphallus.

Figures

FIGURES 208–213. Figs 208–209: Liriomyza schlingeri Spencer, male genitalia; 208: phallus, left lateral; 209: phallus, ventral. Figs 210–213: Liriomyza tricornis spec. nov., male genitalia; 210: external components, ventral; 211: ejaculatory apodeme; 212: phallus, left lateral; 213: phallus, ventral.