Liriomyza cf. trixivora Lonsdale

Eiseman, Charles S. & Lonsdale, Owen, 2019, New State and Host Records for Agromyzidae (Diptera) in the United States, with the Description of Ten New Species, Zootaxa 4661 (1), pp. 1-39 : 16

Liriomyza cf. trixivora Lonsdale

( Figs. 20, 21 , 50, 51 )

Material examined. CALIFORNIA: San Diego Co., Bow Willow , 8.iii.2017, em. 23–29.iii.2017, C.S. Eiseman, ex Trixis californica , puparium in blister on lower leaf surface, CSE3283 , CNC940103–940106 (1³ 3♀) ; same col- lection data, em. 25.iii.2017, pupation external, #CSE3295, CNC940102 (1³).

Host. Asteraceae : Trixis californica Kellogg.

Leaf mine. ( Figs. 50, 51 ) Upper surface; whitish, entirely linear, with the frass in conspicuous alternating black strips. A short terminal portion is formed on the lower surface, where the larva cuts a crescent-shaped exit slit in the epidermis before pupating.

Puparium. ( Figs. 21 , 50 ) Dark brown; in some cases formed externally and in others within the mine or partly protruding from the exit slit.

Distribution. USA: CA; we have found similar leaf mines in AZ.

Comments. The mine and larval habits of this species have not been described previously, apart from the statement by Lonsdale (2011) that the last instar larva pupates inside the leaf. The specimens examined here ( Fig. 20 ) differ slightly from the type series, also from California, and are only tentatively identified: the ventromedial suture of the distiphallus is raised as a shallow carina and the paraphallus is apically hooked.

Figures

FIGURES 14–26. Figs. 14–15: Liriomyza euphorbiella spec. nov.; 14: adult female; 15: puparium. Figs. 16–17: L. garryae spec. nov.; 16: adult male; 17: puparia. Figs. 18–19: L. phloxiphaga spec. nov.; 18: adult male; 19: puparium. Figs. 20–21: L. cf. trixivora Lonsdale; 20: adult male; 21: puparium. Fig. 22: L. virgo (Zetterstedt), puparium. Figs. 23–24: L. zinniae Spencer; 23: adult male; 24: puparium. Figs. 25–26: Phytomyza davisii (Walton); 25: adult male; 26: puparia.

FIGURES 46–56. leaf mines: 46: Liriomyza garryae spec. nov., on Garrya ovata; 47: same; 48: L. phloxiphaga spec. nov., on Phlox paniculata; 49: Liriomyza cf. taraxaci Hering, on Lactuca biennis (mine containing at least three larvae); 50: L. cf. trixivora Lonsdale, puparium in mine; 51: L. cf. trixivora, on Trixis californica; 52: L. virgo (Zetterstedt), on Equisetum fluviatile; 53: L. zinniae Spencer, on Encelia farinosa; 54: same, puparium in lower surface blister; 55: Liriomyza sp. 1, on Chaetopappa bellidifolia (young mine); 56: same (complete and vacated mine).