Liriomyza baccharidis Spencer
Creators: name: Lonsdale, Owen
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Agromyzidae
Liriomyza
Liriomyza baccharidis

description: Liriomyza baccharidis Spencer   
Figs 33–36  
 Liriomyza baccharidis Spencer 1963b: 354. Spencer 1981: 216, 1984: 15; Spencer & Steyskal 1986: 124.   
 Wing length mm 1.8–2.2(♂), 2.2–2.5mm (♀). Length of ultimate section of vein CuA 1 divided by penultimate section: 1.5–2.7. Eye height divided by gena height: 4.0–5.3. Scutum shining. Epistoma relatively broad.   
 Chaetotaxy: Two ori (sometimes three on one side), two ors. Acrostichal setulae in four rows.   
 Colouration: Calypter margin and hairs grey. Head yellow with back of head, ocellar tubercle, stripe on ventral margin of gena, clypeus and posterolateral frons to base of inner vertical bristle dark brown; first flagellomere dark yellow; face brown; lateral margin of frons with thin brown line. Scutum with lateral yellow stripe sometimes brownish or mottled behind wing base; laterotergites dark with posterodorsal corner of anatergite yellowish lateral to scutellum. Pleuron dark with dorsomedial margin of katepisternum yellow, and anterodorsal to entire dorsal margin of anepisternum yellow. Coxae brown with yellow mottling; basal ¼ or less of femora brown with dorsobasal half sometimes mottled; tibiae and tarsi dark brown. Abdomen dark brown.   
 Genitalia: Figs 33–36. Surstylus C-shaped with short dark spine at each end. Paraphallus dark, thick and curved. Hypophallus relatively small with short subapical hairs. Mesophallus not evident. Distiphallus dark and cylindrical with slight subbasal constriction; with complete ventral suture and thickly enclosed apical chamber containing one pair of very short fringed structures. Stem of ejaculatory apodeme thin; duct pigmented basally; blade broad with medial annulations and dark margin.   
 Variation: Darker males differ as follows: scape and surrounding lunule brownish; dark lateral stripe onfrons sometimes extending to surround base of ors, or base of all fronto-orbitals surrounded by thin brown spot; mid and hind femora with light dorsal mottling; anepisternum and coxae entirely dark.   
 Hosts. Asteraceae — Artemisia douglasiana, Baccharis douglasii, B. floribunda, B. pilularis, Baccharis sp., Conyza bonariensis, C. canadensis, Conyza sp. [?]. Adult[?] on Cornus californica (Spencer, 1981, 1984, 1990).   
 Range. USA. Arizona *, California [Alameda, Contra Costa, Del Norte*, Fresno*, Humboldt*, Los Angeles*, Marin, Modoc*, Monterey, Placer*, Riverside, Sacramento*, San Bernardino*, San Diego*, San Francisco*, San Luis Obispo*, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Sonoma*, Tuolumne, Ventura], Idaho *, Washington. Colombia. Venezuela. Likely present throughout Central America (Spencer, 1981).   
 Type material. Holotype, COLOMBIA. Tequendama Falls, nr. Bogotá, bred ex. leaf mine on Baccharis floribunda H.B.&K., 26.xii.1958, K.A. Spencer (1♂, BMNH). [Not examined]   
 Additional material examined. USA. Arizona:  Superior, 13.iv.1935, A.L. Melander (1♂, USNM), California: Alameda Co., Berkeley, 7.x.1948, on leaf of Cornus californica Mey., Lot No. 10-2, K.E. Frick (1♂, CASC), Albany, 13.viii.1948, ex. larva Baccharis douglasii DC., Lot No. 41-1 (1♂ 1♀ [on slide], CASC), Strawberry Cyn., Berkeley Hills, 14.x.1962, C.A. Toschi (1♀, EMEC), Berkeley, Baccharis -like plant, emerged “5-15±25”, W.W. Jones (1♂, EMEC), Berkeley, “ Baccharis?”, “12-29-24” (1♀, EMEC), “3-25-28” (1♀, EMEC), Contra Costa Co., El Cerrito, 880’, 10.ix.1967, collected in house, D.D. Linsdale (1♀, CASC), Orinda, E. Schlinger, 29.vi.1970 (1♂, EMEC), 18.vi.1970 (1♀, EMEC), 19.vi.1970 (1♀, EMEC), 2mi SE Lafayette, 756’, 10.iv.1968, dry ice Malaise trap, W.J. Turner (1♀, EMEC), Del Norte, Six Rivers NF For Route 16N02, nr. Bear Basin Outlk, 41.8016°N, 123.7369°W, 1500m, 3.vi–24.vii.2009, P. Kerr & O. Lonsdale (5♂ 5♀, CSCA), Fresno Co., Sequoia Lake, 7.vi.1935, A.L. Melander (1♂, USNM), Humboldt Co., McKinleyville bog area nr. Azalea Avenue, 9.vii.1980, T.W. Davies (1♂ 1♀, CASC), Grizzly Creek State park, 11.viii.1953, P.H. Arnaud, Jr. (1♀, CASC), Dry Lagoon Beach State Park, 10.viii.1953, P.H. Arnaud, Jr. (1♂, CASC), Big Lagoon, 3.vii.1969, J. Powell (1♀, EMEC), Los Angeles Co., Big Dalton Dam, 13.vii.1950, W.C. Bentinck (1♀ 1?, EMEC), Tanbark Flat, 27.vi.1956, W.C. Bentinck (1♀, EMEC), Marin Co., Point Reyes Peninsula, 8mi. NW of Inverness, 12.ix.1967, T.W. Davies (1♀, CASC), Modoc Co., Cedar Pass campground, 11.viii.1967, 1800m, P.H. Arnaud, Jr. (1♂, CASC), Monterey Co., Castroville, 23.vi.1965, E.L. Smith (3♂ 1♀, UCD), Placer Co., Bear Vy., 1mi N of Emigrant Gap, 5.vi.1970, J. Powell (1♂, EMEC), Riverside Co., Riverside, A.L. Melander, 5.v.1935 (2♂, CSCA), 24.ii.1935 (1♂, CSCA), 10.iii.1946 (1♂, USNM), Palm Springs, 17.i.1953, P.H. Arnaud (1♂, USNM), Sacramento Co., Sacramento, 21.iii.1977, Malaise trap, M. Wasbauer (1♂, CSCA), San Bernardino Co., S fork Santa Ana River, vic. Melander cabin, 2.vii.1968, 1950m, P.H. Arnaud, Jr. (1♀, CASC), Wrightwood, 24.vii.1945, Collection of Grace H. & John L. Sperry (1♂ [pinned with two L. septentrionalis], USNM), San Diego Co., Buena Vista Lagoon, 19.vi.1996, M. Gates, LM96-451 (1♂, USNM), San Francisco, Lake Merced, 21.vi.1964, P.H. Arnaud, Jr. (3♀, CASC), San Luis Obispo Co., Montana de Oro St. Pk., dunes, 3mi SW Los Osos, M. Wasbauer & P. Adams, Malaise trap 9A-5P, 13–15.viii.1983 (1♀, CSCA), Malaise trap 10A-4P, 16–17.viii.1983 (1♀, CSCA), Oso Flaco Lk., 14.vii.1965, M.L. Gardner (2♀, UCD), San Mateo Co., San Bruno Mountains, Guadalupe Canyon Parkway, 25.viii.1979, P.H. Arnaud, Jr. (1♂, CASC), Mt. San Bruno, 28.iii.1969, P.A. Opler (1♂, EMEC), San Mateo Memorial Park, 31.vii.1971, S.E. Tatro (1♂, CASC), Skyline Blvd., LaHonda Rd., 16.viii.1952, P.H. Arnaud, Jr. (1♂, USNM), Santa Barbara Co., U.C. Goleta, 26.vi.1965, M. R. Gardner (1♂, UCD), UC Coal Oil Pt. Reserve, 34.4105’N, 119.8798’W, Malaise, M. Caterino & A. Borrell, 17–29.iii.2003 (2♂, SBMN), 8–22.iv.2003 (1♂ 2♀, SBMN), 2mi E Solvang, 28.vi.1955, J. Powell (6♂ 2♀, EMEC), Los Prietos, 25.vi.1965, J. Powell (2♀, EMEC), Santa Clara Co., Stanford U., P.H. Arnaud, Jr., 2.vii.1957 (1♂, CASC), Santa Cruz, Aptos, 11.ix.1948, ex. larva Erigeron canadensis L. [= Conyza canadensis], Lot No. 150-2, K.E. Frick (1♀, CASC), Stanford, em. 24.iv.1947 (1♂, USNM), Santa Cruz Co., along Hwy. 17 nr. Glenwood, 22.iv.1977, D. Wilder (1♂, CASC), Sonoma Co., Atlascadera Creek, NW Graton, Williams property, ca. 30m, 21.viii.1966, P.H. Arnaud, Jr. (1♀, CASC), Soquel, ex. larva Baccharis douglasii D.C., Lot No., 151-2, K.E. Frick (1♂, CASC), Soquel 14.viii.1948, ex. larva Baccharis douglasii DC., Lot No. 151-2 (1♂ [on slide], CASC), Santa Cruz, 21.x.1948, ex. larva cultivated Aster sp., Lot No. 181-2 (1♂ 1♀ [on slide], CASC), Tuolumne Co., Sonora Pass, el. 9000, 22.vii.1951, W.C. Bentinck (1♂, EMEC), Ventura Co., Santa Cruz Island, Prisoner’s Harbor Cr., 1.v.1966, J. Powell (1♀, EMEC), Idaho: Priest Lake, 1.viii.1916, A.L. Melander (1♂, USNM), Washington: Mt. Rainier, Ohanapecosh, 11.viii.1940, A.L. Melander (1♂, USNM).   
 Comments. Liriomyza baccharidis is a relatively widespread and commonly-encountered species in California that can be diagnosed externally by a dark brown stripe on the venter of the gena, a similarly dark face and a contrasting yellow antenna. This dark colouration distinguishes it from L. brassicae, another frequently encountered species that has a similar dark, cylindrical and medially constricted distiphallus. The surstylus of L. baccharidis is also unique among agromyzids in being broad and C-shaped.
description: Published as part of Lonsdale, Owen, 2011, The Liriomyza (Agromyzidae: Schizophora: Diptera) of California 2850, pp. 1-123 in Zootaxa 2850 (1) on pages 25-27, DOI: 10.11646/zootaxa.2850.1.1, http://zenodo.org/record/5287220