Systena nitentula (Coleoptera: Chrysomelidae), a Flea Beetle Injurious to Alternanthera philoxeroides (Amaranthaceae): Redescription, Biology, and Distribution
NORA CABRERA; ALEJANDRO SOSA; JIMENA DORADO; MIC JULIEN
ANNALS OF THE ENTOMOLOGYCAL SOCIETY OF AMERICA
Entomological Society of America
Año: 2005 vol. 68 p. 643 - 643
ABSTRACT Flea beetles of alligator weed, Alternanthera philoxeroides (Martius) Grisebach (Amaranthaceae),were collected in Argentina, Uruguay, Paraguay, and Brazil. Species in the generaDisonycha Chevrolat, Agasicles Jacoby, and Systena Chevrolat were frequently found on this weed.Systena nitentula Bechyne´ 1954 was the most abundant within Systena. This species is reported for theÞrst time from Argentina at north of 30 S. The male is described and holotype female is redescribedadding new diagnostic characters: mouthparts, hind wings, metendosternite, and male and femalegenitalia. S. nitentula is recognized by the combined characters of piceous elytra with J-shaped vittae,a small spermatheca pump, and internal median lobe sac with Þve sclerotized plates. Differences incolor patterns between S. nitentula, S. tenuis Bechyne´ , and S. s-littera L. also are considered.S. nintentula presents three instars that can be separated through head width. New biological databased on laboratory rearing and Þeld observations shows that S. nintentula could be a monophagousspecies strongly associated to the alligator weed growing in terrestrial conditions. This informationpromotes S. nintentula as a potential biocontrol agent of this invasive weed.