Translator Disclaimer
1 December 2004 Survivorship of Immature Stages of Eurypedus nigrosignatus Boheman (Chrysomelidae: Cassidinae: Physonotini) in Central Panama
Author Affiliations +
Abstract

Larvae of the leaf beetle Eurypedus nigrosignatus Boheman carry fecula and cast skins on their dorsa forming a protective device, commonly called a fecal shield. Survival from egg to adult eclosion, natural enemies, and relation to its hostplant, Cordia curassavica (Jacq.) Roem. and Schult. (Boraginaceae) were assessed. Overall survival was 2%; eggs and fourth instars were less susceptible to enemies than were early larval stages and pupae. Predation accounted for the low survival of larvae, whereas parasitism for a low success rate of pupae. Six different predators including three spiders (Arachnida), a pentatomid, a reduviid (Heteroptera), and an ant (Hymenoptera) were observed. Reared parasitoids included a chalcidid (Hymenoptera) and a tachinid (Diptera). The fecal shield increases in size throughout larval development; however, the shield of prepupal individuals is partially lost. Shield chemical content very closely reassambles that of a particular host plant. Although the lower terpenoid concentration (per weight) in shields decreases with larval development, bigger shields as a unit contain larger amounts. Adults spend the Panamanian dry season buried in the ground directly under host plants. Eurypedus nigrosignatus is under intense selective pressures in Central Panama.

Nélida E. Gómez "Survivorship of Immature Stages of Eurypedus nigrosignatus Boheman (Chrysomelidae: Cassidinae: Physonotini) in Central Panama," The Coleopterists Bulletin 58(4), 489-500, (1 December 2004). https://doi.org/10.1649/634
Received: 25 September 2002; Accepted: 1 May 2003; Published: 1 December 2004
JOURNAL ARTICLE
12 PAGES


SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top