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Thrips of California 2012

Baileyothrips arizonensis

Recognition data

Distinguishing features

Both sexes fully winged. Body and legs yellow with faint shadings, distal antennal segments darkest, wings pale. Head and pronotum with no prominent setae. Head with 3 pairs of minute ocellar setae, pair III on anterior margins of triangle; 2 pairs of minute postocellar setae. Antennae 8-segmented, III–IV with small forked sensorium. Metanotum reticulate, median setae small and far back from anterior margin. Fore wing first vein with 4 or 5 widely spaced small setae on distal half, second vein with 8 to 10 small setae; marginal cilia not wavy. Abdominal tergites II–VII with posteromarginal craspedum that is toothed laterally, median setae longer than the distance between their bases; tergite VIII with posteromarginal comb of fine microtrichia; IX with median setae shorter than submedian pair. Sternites IV–VI with about 8 small marginal setae, also 8–10 small discal setae.

Male sternite III with glandular opening medially on antecostal region.

Related and similar species

Only two species are recognized in this genus. The second one, B. limbatus (Hood), is known from various parts of the Caribbean area in association with the weed Chamaesyce hyssopifolia (Euphorbiaceae) (Mound & Marullo, 1996).

Taxonomic data

Current valid name

Baileyothrips arizonensis (Morgan)

Original name and synonyms

  • Anaphothrips arizonensis Morgan, 1913: 12
  • Anaphothrips minutus Moulton, 1929: 127

Family placement

Thripidae, Thripinae

Biological data

Life history

Presumably flower-living

Host plants

Possibly a species of Euphorbia (Euphorbiaceae).

Tospoviruses vectored


Crop damage


Distribution data

Area of origin

Western USA


California, Arizona, New Mexico, Texas.