| Home | Kingdom Animalia | Phylum Arthropoda | Class Insecta | Order Coleoptera | Suborder Adephaga | Family Amphizoidae | Common Name: Trout Stream Beetles |  |
Amphizoidae
Trout Stream Beetles
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Introduction:
Amphizoid larvae and adults are found in or near mountain streams; species are known form China and western North America. Superficially, they resemble some tenebrionids, though they are quickly distinguished by their 5-5-5 tarsal formula (5-5-4 in Tenebrionidae). Like most Adephaga amphizoids possess abdominal defensive glands. When disturbed, adults secrete a yellowish fluid from their anus that smells like decaying wood.
Amphizoid larvae and adults are found in or near mountain streams; species are known form China and western North America. Superficially, they resemble some tenebrionids, though they are quickly distinguished by their 5-5-5 tarsal formula (5-5-4 in Tenebrionidae). Like most Adephaga amphizoids possess abdominal defensive glands. When disturbed, adults secrete a yellowish fluid from their anus that smells like decaying wood.
Adult Diagnosis:
black to piceus head two-thirds as wide as pronotum antennae 11-segmented, filiform pronotum roughly two-thirds elytral width notopleural sutures present tarsal formula 5-5-5 1st abdominal ventrite bisected by metathoracic coxae Length 11-16 mm
black to piceus head two-thirds as wide as pronotum antennae 11-segmented, filiform pronotum roughly two-thirds elytral width notopleural sutures present tarsal formula 5-5-5 1st abdominal ventrite bisected by metathoracic coxae Length 11-16 mm
Immature Diagnosis:
well sclerotized dorsally, pale and fleshy ventrally dorsal plates extending laterally, forming lobes 8th abdominal spiracles large
well sclerotized dorsally, pale and fleshy ventrally dorsal plates extending laterally, forming lobes 8th abdominal spiracles large
Ecology:
Aquatic, larvae often hold eight abdominal segment above the water line to replenish air supply. Adults are generally found clinging to flotsam such as pine needles, where they appear to be predaceous, especially upon Plecoptera immatures. NOT in Midwestern states.
Aquatic, larvae often hold eight abdominal segment above the water line to replenish air supply. Adults are generally found clinging to flotsam such as pine needles, where they appear to be predaceous, especially upon Plecoptera immatures. NOT in Midwestern states.
