Liriomyza arnaudi Spencer

Lonsdale, Owen, 2011, The Liriomyza (Agromyzidae: Schizophora: Diptera) of California 2850, Zootaxa 2850 (1), pp. 1-123 : 22

Liriomyza arnaudi Spencer

Figs 24–25

Liriomyza arnaudi Spencer 1981: 212 . Spencer & Steyskal 1986: 121.

Wing length 1.7mm (♂). Female unknown. Length of ultimate section of vein CuA 1 divided by penultimate section: 4.6. Eye height divided by gena height: 5.0. Scutum shining. First flagellomere relatively large and spherical.

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

Colouration: Calypter margin and hairs grey. Head yellow with back of head, ocellar tubercle, clypeus and stripe from posterolateral margin of frons to base of inner vertical bristle (but not touching bristle) dark brown; first flagellomere infuscated along dorsal margin with stripe becoming darker to arista base. Postsutural scutum only yellow along transverse suture laterally; katatergite brown ventrally; anatergite dark below scutellum, and with lateral section paler with posterodorsal corner yellowish. Anepisternum brown on ventral half; anepimeron brown with yellow mottling; meron brown with dorsal margin yellow; ventral ¾ of katepisternum brown (bristle surrounded by yellow). Mid and fore tibiae and tarsus brown; hind legs missing; remainder of legs yellow. Abdomen colour unknown.

Genitalia: Figs 24, 25 . Surstylus relatively short, with single subapical spine; tapering and lightly setose apically. Paraphallus more heavily sclerotized along anterior margin and upcurved apically. Mesophallus thin and weakly-pigmented ventrally, confluent with distiphallus dorsally. Distiphallus not much longer than mesophallus, pale, cup-shaped, slightly tapered apically and compressed to a point. Ejaculatory apodeme broad, paler apically and with sharp corners on blade.

Host. Unknown.

Range. USA. California [Riverside].

Type material. Holotype, USA. California: Riverside Co., Agua Caliente Indian Reserve, Palm Canyon , 23.ii.1970, P.H. Arnaud, Jr., Type No. 13932 (1♂, CASC).

Comments. The phallus is relatively nondescript in this species, but the mesophallus is directed dorsally and the paraphallus is strongly curved and pointed apically. Externally, the first flagellomere is unusual in being infuscated dorsally (not anteriorly). A similar antenna is seen in Liriomyza trixivora and L. tubula , but in L. trixivora the first flagellomere is usually subquadrate and more extensively infuscated, the pleuron is weakly pigmented, the length of the ultimate section of vein CuA 1 divided by the penultimate section is 2.6–3.6, the paraphallus is not bent, the distiphallus is not directed dorsally (although it is similarly sized) and the surstylus has two spines. In L. tubula the first flagellomere is also subquadrate, there are no more than two rows of acrostichal setulae, the parafacial and orbital plate are projecting, the femora are brown basally, the length of the ultimate section of vein CuA 1 divided by the penultimate section is 2.2–2.3 and the distiphallus has one long pair of apical tubules.

Figures

FIGURES 19–25. Figs 19–23: Liriomyza admiranda Spencer, male genitalia; 19: holotype phallus, right lateral; 20: ejaculatory apodeme; 21: external components, ventral; 22: phallus, ventral; 23: phallus, left lateral. Figs 24–25: Liriomyza arnaudi Spencer, male holotype genitalia; 24: ventral, with phallus broken off and shown to right (right lateral view with most of basiphallus missing); 25: phallus, ventral, from original figure in Spencer (1981).