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Thrips of California 2012

Arorathrips mexicanus

Recognition data

Distinguishing features

Female fully winged, dark brown when mature but bicolored when recently emerged. Antennae 8-segmented, segments III–IV with simple sensorium stout; segment II prolonged externally with terminal sensorium. Head small, projecting in front of eyes, vertex with about 3 pairs of setae. Pronotum trapezoidal, 2 pairs of prominent posteroangular setae. Fore coxae enlarged and transverse, fore femora swollen, fore tibia extending around external margin of fore tarsus. Meso and metafurca weakly developed. Fore wing slender, apex pointed, first vein with 3 setae distally, second vein with 3–4 widely spaced setae. Tergites with transverse sculpture lines medially; antecostal ridge of tergites II–V with row of small tubercles; craspedum complete on I–VIII. Ovipositor weak, without teeth. Sternites II–IV medially with pattern of tubercles.

Male wingless, yellow; sternites III–VII medially with large circular pore plate.

Related and similar species

The genus Arorathrips now comprises 15 described New World species (Nakahara & Foottit, 2012). These all differ from the members of Chirothrips in having the mesothoracic endofurca greatly reduced. A. mexicanus is closely related to A. crassiscelis Strassen that is presumed to have come from Argentina and has a larger number of setae on the head.

Taxonomic data

Current valid name

Arorathrips mexicanus (Crawford DL)

Original name and synonyms

  • Chirothrips mexicanus Crawford DL, 1909: 114
  • Chirothrips floridensis Watson, 1920: 22
  • Chirothrips catchingsi Watson, 1924: 76
  • Chirothrips saltensis Tapia, 1952: 109

Family placement

Thripidae, Thripinae

Biological data

Life history

Breeding within individual florets of various Poaceae.

Host plants

Recorded from many different grasses, but with no recorded specificity.

Tospoviruses vectored


Crop damage

None recorded.

Distribution data

Area of origin

Probably South America


Widespread throughout the world in tropical countries.