Life Cycle – Red-headed Chrysomela leaf beetle

22 Apr
A red-headed Chrysomela leaf beetle (Chrysomela texana).

A red-headed Chrysomela leaf beetle (Chrysomela texana).

These  red-headed Chrysomela leaf beetles were all over the park near my home this week, mostly in the vicinity of a large willow tree, the beetles’ food of choice.  Chrysomela texana are close relatives of the cottonwood leaf beetle (Chrysomela scripta).   C. texana can be easily distinguished by it’s red pronotum, head, and underside (most similar species have distinct black markings on these areas).  Every life stage of the beetle was apparent, from the yellow eggs laid in clusters on a leaf, to the lady beetle-like black and brown larvae, skeletonizing the surrounding vegetation in gregarious clusters, the red-brown pupae.

A cluster of yellow red-headed Chrysomela leaf beetle eggs on the underside of a leaf.

A cluster of yellow red-headed Chrysomela leaf beetle eggs on the underside of a leaf.

(Note: The egg hunt was successful.  Happy Easter!)

Red-headed Chrysomela leaf beetle larvae (Chrysomelidae: Chrysomela texana) skeletonize a willow leaf.

A gregarious cluster of red-headed Chrysomela leaf beetle larvae skeletonize a willow leaf.

Like swallowtail caterpillars, the larvae have cool, eversible glands which they use to secrete defensive chemicals (as pictured by Mike Quinn on BugGuide).  The pupae of these beetles were particularly abundant.  They seemed to be stuck to every surface I looked at–tucked under bark, into crevices, dangling from leaves and even from small flowers and weeds.  This gave me the chance to snap the pictures below of a beetle struggling out of its pupal case. I even took a few home, but they were sneaky and eclosed on me when I wasn’t looking.

A red-headed Chrysomela leaf beetle (Chrysomela texana) ecloses from its pupal case.

A red-headed Chrysomela leaf beetle (Chrysomela texana) ecloses from its pupal case.

A red-headed Chrysomela leaf-beetle ecloses from its pupal case (Chrysomelidae: Chrysomela texana).

A red-headed Chrysomela leaf-beetle ecloses from its pupal case.

Cast of pupal case of a red-headed Chrysomela leaf beetle (Chrysomelidae: Chrysomela texana).

Cast off pupal case of a red-headed Chrysomela leaf beetle.

*edit*

Surprise bonus image!  Now the life cycle is complete. 😉

A mating pair of red-headed Chrysomela leaf beetles (Chrysomelidae: Chrysomela texana).

A mating pair of red-headed Chrysomela leaf beetles (Chrysomela texana).

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