Abstract
Microspines in the cockroach (Blattaria) hindgut were studied to determine their structure, variation, and potential use in classification. Short spines (1–10 μm) were found in all regions of the hindgut, except for the rectal cuticle in all species, the posterior region of the ileum and colon in C. punctulatus and the posterior portion of the ileum of the blaberoid species. They were also characteristics of the pyloric and other valvular cuticle between areas of the hindgut. Moderate (20–60 μm) and long (over 100 μm) microspinal lengths were associated with bacterial aggregations or plaques in the ileum. Microspinal modifications showed only poor phylogenetic correlations.
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