Amphizoa

Taxobox
name = "Amphizoa"
regnum = Animalia
phylum = Arthropoda
classis = Insecta
ordo = Coleoptera
familia = Amphizoidae
genus = "Amphizoa"
genus_authority = LeConte, 1853
subdivision_ranks = Species
subdivision = "Amphizoa carinata"
"Amphizoa davidi"
"Amphizoa insolens"
"Amphizoa lecontei"
"Amphizoa sinica"
"Amphizoa striata"

"Amphizoa" is a genus of beetles, placed in its own family, Amphizoidae. It comprises six species, three from western North America and three from China. The vernacular name "trout-stream beetle" comes from the original finding of "A. insolens" and "A. lecontei" in high mountain streams, although other species occur at lower elevation. They are notable as a possible intermediate stage between terrestrial and aquatic beetles; while living in the water, they are not good swimmers and physically resemble ground beetles more than other types of water beetle.

Ranging in length from 11 to 16 mm, they are generally a dull black, with a squarish head and a pronotum significantly narrower than the elytra.

The larvae also live underwater, but breathe through the eighth abdominal segment and must therefore stay close to the surface. They cling to rocks or floating debris. Both adults and larvae are predators, but will also scavenge dead insects.

When disturbed, adults exude a yellowish fluid from the anus, with an odor described as that of canteloupe or decaying wood, probably as a defensive mechanism against hungry frogs and toads.

External links

* [http://www.sbnature.org/collections/invert/entom/s_p_amphi_insol.php Species page California Beetles Project]

References

* T. Keith Philips and Weiping Xie, "Amphizoidae", in Ross H. Arnett, Jr. and Michael C. Thomas, "American Beetles" (CRC Press, 2001), vol. 1