Desert cockroach
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| iDesert cockroach | ||||||||||||||
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| Arenivaga investigata Friauf and Edney, 1969 |
The desert cockroach, Arenivaga investigata, is a member of the Polyphagidae family of cockroaches.
[edit] Distribution
Arenivaga investigata is abundant in sand dunes of the Colorado desert at the foot of San Jacinto Peak, California.
[edit] Water vapor absorption
The desert cockroach can gain weight by absorption of water vapor from unsaturated atmospheres above 82.5% relative humidity. Blocking the anus or the dorsal surface with wax does not prevent water vapor uptake, but interference with movements of the mouthparts or blocking the mouth with wax prevents such uptake. Weight gains are associated with the protrusion from the mouth of two bladder-like extensions of the hypopharynx. During absorption these structures are warmer than the surrounding mouthparts, their surface temperature increasing with relative humidity. This suggests that the surfaces of the bladder-like structures function at least as sites for condensation of water vapor, but the precise location of its transfer into the hemolymph has not yet been identified [1].
[edit] References
- ^ M. J. O'Donnell. Site of Water Vapor Absorption in the Desert Cockroach, Arenivaga investigata. National Academy of Sciences. Retrieved on 11 June 2006.
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