Defensive glands in the adult and larval stages of the darkling beetle, Luprops tristis
Litter Entomology Research Unit, Post Graduate & Research Department of Zoology, St. Joseph’s College, Devagiri, Calicut, Kerala, 673008, India.
Abstract
Invasion by large populations of the litter-dwelling darkling beetle Luprops tristis Fabricius (Coleoptera: Tenebrionidae) following the short spell of summer rains during April, and their extended state of dormancy is a regular event in rubber plantation habitats in south-western India. Strong smelling secretions of the beetle cause blisters on skin of human beings. Such secretions appear defensive because they appear to facilitate their avoidance by other predatory organisms. Defensive glands in the larvae and adults of L. tristis are described, as well as the mode of eversion of the glands. The glands in larvae consist of two pairs of noneversible glands in a conical depression on the 2nd and 3rd sternites, whereas in adults only one pair occurs between 7th and 8th sternal segments. These glands may be a major reason for avoidance of larvae and adults by their natural enemies and their very high numbers in the litter of rubber plantations.
Keywords: rubber plantations, litter beetle, Mupli, aggregation, dormancy
Correspondence: *sabukthomas@gmail.com *Corresponding author
Received: 3 March 2008 | Accepted: 16 November 2008 | Published: 25 February 2010
Copyright: This is an open access paper. We use the Creative Commons Attribution 3.0 license that permits unrestricted use, provided that the paper is properly attributed.
ISSN: 1536-2442 | Volume 10, Number 7
Abhitha P. Vinod KV. Sabu TK. 2010, Defensive glands in the adult and larval stages of the darkling beetle, Luprops tristis. 5pp. Journal of Insect Science 10:7, available online: insectscience.org/10.7
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