Liriomyza lathyroides (Spencer)

Lonsdale, Owen, 2011, The Liriomyza (Agromyzidae: Schizophora: Diptera) of California 2850, Zootaxa 2850 (1), pp. 1-123 : 62-64

Liriomyza lathyroides (Spencer)

Figs 132, 133

Amauromyza (Annimyzella) lathyroides Spencer 1981: 145 . Spencer & Steyskal 1986: 83.

Amauromyza lathyroides . Spencer 1990: 131.

Liriomyza lathyroides . Zlobin 1996: 277.

Wing length 2.2mm (♂) (recorded as 2.0mm in Spencer (1981)), 2.3mm (♀). Length of ultimate section of vein CuA 1 divided by penultimate section: 2.0. Eye height divided by gena height: 4.2. Scutum subshining. Epistoma large. Parafacial and orbital plate strongly projecting.

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

Colouration: Calypter margin and hairs dark brown. Head yellow with back of head, posterior margin of frons, ocellar triangle, orbital plate, antenna, face, clypeus and lower margin of gena dark brown; oblique region encompassing vertical bristles brown. Remainder of body dark brown with postpronotum (excluding large dark anteromedial spot), notopleuron and apices of femora yellow, with apex of hind femur more narrowly and faintly yellow.

Genitalia: Figs 132, 133 . Epandrium without spine. Surstylus relatively narrow, broadly rounded apically and with one subapical spine. Basiphallus comprised of one pair of slightly diverging bars. Apical swollen section of ejaculatory duct wide, broadly ovate.Hypophallus weakly sclerotized medially, enclosing base of well developed tuft of hairs; right lateral surface of membranous region lightly sclerotized, left lateral surface with small, irregularly sclerotized patches. Distiphallus with long basal stem (possibly homologous with mesophallus) strongly bent at midpoint and widening to broad medial recurved region with ventral suture enclosing dark thin bar; apically with one pair of long, dark tubules formed from hairs. Ejaculatory apodeme large, dark and well developed with distal half of blade paler, excluding lightly striated apical margin; base of duct and pileus ejaculatorius dark and well sclerotized, nearly encompassing stem.

Hosts. Fabaceae — Lathyrus vestitus ; likely other Lathyrus spp. ( Spencer, 1981) .

Range. USA. California (Alameda, Amador, Contra Costa, Marin), Oregon .

Type material. Holotype, USA. Californai: Alameda Co., east end of Caldecott Tunnel , 18.v.1977, on Lathyrus vestitus, K.A. Spencer (1♂, USNM) [Not examined] ; Paratype examined, USA. California: Marin Co., Mill Valley , 360’, FT, 1–6.viii.1966, P.H. Arnaud, Jr. (1♂, CASC) .

Comments. Liriomyza lathyroides is an unusually dark species, with the face, antenna, orbital plate, pleuron and the entirety of the scutellum dark brown. This, combined with three pairs of ori, a large pronounced epistoma, a projecting orbital plate and parafacial, and an elongate dark, bifid distiphallus readily characterize the species. Similar taxa belong to the genus Amauromyza Hendel (the genus in which it was originally described), particularly A. remus Spencer , but these species have differing notal and cephalic chaetotaxy, an entirely dark notum and do not have the apically swollen ejaculatory duct typical of Liriomyza .

Figures

FIGURES 132–137. Figs 132–135: Liriomyza lathyroides (Spencer), male genitalia; 132: CASC paratype, phallus, ventral; 133: USNM holotype, from original figure in Spencer (1981), left half of epandrium (ventral), phallus and ejaculatory apodeme. Figs 134–137: L. lupinella Spencer, male genitalia; 134: ejaculatory apodeme; 135: external components, ventral; 136: phallus, left lateral; 137: phallus, ventral.