Ectoperitrophic-space
Guides
Xylotopus par
Xylotopus par is an aquatic xylophagous midge in the family Chironomidae. The larvae colonize submerged wood substrates in freshwater streams, feeding on decaying wood. Populations exhibit plastic phenology, with development rates varying based on wood substrate quality—larvae in fresh, introduced wood can complete development in a single summer, while those in indigenous logs normally require a full year. The species has been studied for its unique bacterial associations in the larval midgut, where morphotypically uniform bacteria form a well-defined band in the posterior midgut's ectoperitrophic space.