Hostname: page-component-586b7cd67f-g8jcs Total loading time: 0 Render date: 2024-11-24T19:35:42.907Z Has data issue: false hasContentIssue false
  • English
  • Français

EGG, LARVA, AND PUPA OF LEXIPHANES SAPONATUS (COLEOPTERA: CHRYSOMELIDAE: CRYPTOCEPHALINAE)

Published online by Cambridge University Press:  31 May 2012

Laurent LeSage
Laurent LeSage
Affiliation:
Biosystematics Research Institute, Agriculture Canada, Ottawa K1A 0C6
Get access Rights & Permissions [Opens in a new window]

Abstract

The immature stages of Lexiphanes saponatus (Fabricius) are the first members of Nearctic Cryptocephalinae to be described as well as to be studied. The egg is coated with oblique ornamentations as in other Cryptocephalinae. The larva shows several resemblances with that of the Palearctic genus Suffrianus from which it is distinguished mainly by its large papillate frontal setae. The pupa resembles in general those of Chlamisinae but bears very distinctive projections on the seventh and ninth abdominal segments. The life cycle of L. saponatus is also very interesting. Unlike most other cryptocephaline larvae which live in the leaf litter and are unable to climb on plants, the larva of L. saponatus moves easily on its host plant (Cassandra calyculata) and mimics perfectly the plant buds, becoming almost invisible to the human eye. Although me information is incomplete, it is evident that L. saponatus overwinters in the larval stage, in the first or second instar. It is not known if the larva completes its development during the following warm season or overwinters twice as in other Cryptocephalinae.

Résumé

Les différents stades biologiques de Lexiphanes saponatus (Fabricius) sont décrits pour la première fois et constituent aussi les premiers représentants nord-américains de la sous-famille des Cryptocephalinae à être étudiés. L'oeuf est orné d'un motif oblique comme chez les autres membres de cette sous-famille. La larve montre beaucoup d'affinités avec la larve du genre paléarctique Suffrianus et s'en distingue surtout par ses grosses soies frontales papilleuses. La nymphe ressemble en général à celles des Chlamisinae mais possède des protubérances sur les septième et neuvième segments abdominaux tout à fait caractéristiques. Contrairement aux autres larves de Cryptocephalinae qui vivent dans la litière et ne peuvent grimper aux plantes, celle de L. saponatus se meut sans problème sur la plante-hôte (Cassandra calyculata) et imite à la perfection ses bourgeons la rendant à peu près invisible même pour l'oeil averti. Il est certain que L. saponatus hiberne à l'état larvaire, au premier ou au deuxième stade mais on ne sait pas si la larve se transforme en adulte dès la saison chaude suivante ou si elle hiberne une seconde fois, comme cela se produit chez d'autres espèces de Cryptocephalinae.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 4 , April 1984 , pp. 537 - 548
Copyright
Copyright © Entomological Society of Canada 1984

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Anderson, W. H. 1947. A terminology for the anatomical characters useful in the taxonomy of weevil larvae. Proc. ent. Soc. Wash. 49: 123–132.Google Scholar
Balsbaugh, E. U. 1966. Genus Lexiphanes of America north of Mexico (Coleoptera: Chrysomelidae). Proc. US. natn. Mus. 117: 655–680.CrossRefGoogle Scholar
Balsbaugh, E. U. and Hays, K. L.. 1972. The leaf beetles of Alabama (Coleoptera: Chrysomelidae). Alabama agric. exp. Stn Auburn Univ. Bull. 441. 223 pp.Google Scholar
Fiori, G. 1951. Contribution in the morphology and etiology of Coleoptera 5. Boll. 1st. ent. Bologna 18: 182–196.Google Scholar
LeSage, L. 1982. The immature stages of Exema canadensis Pierce (Coleoptera: Chrysomelidae). Coleopts Bull. 36: 318–327.Google Scholar
LeSage, L. 1984. Immature stages of Canadian Neochlamisus (Coleoptera: Chrysomelidae). Can. Ent. 116: 383–409.CrossRefGoogle Scholar
Medvedev, L. N. and Zaitzev, Y. M.. 1978. The Larvae of Chrysomelid Beetles of Siberia and the Far East. Nauka, Moscow. 182 pp. (In Russian.)Google Scholar
Oglobin, D. A. and Medvedev, L. N.. 1965. A survey of Cryptocephalinae larvae (Coleoptera, Chrysomelidae) of the forest zone in the European part of the USSR. Zool. Zh. 44: 1018–1027. (In Russian.)Google Scholar
Wilcox, J. A. 1974. Checklist of the Chrysomelidae of Canada, United States, Mexico, Central America and the West Indies. North American Beetle Fauna Project. Red Version. Biological Research Institute, New York. 166 pp.Google Scholar