Sediment-microhabitat
Guides
Cordulegaster dorsalis
Pacific spiketail
Cordulegaster dorsalis, commonly known as the Pacific spiketail, is a dragonfly species in the family Cordulegastridae. Larvae inhabit intermittent headwater streams and typically require three years to reach maturity, emerging as adults during July and August. The species shows evidence of sediment microhabitat partitioning, with smaller larval instars associated with finer-grained organic sediments.