Gut-symbiosis
Guides
Cryptocercus
wood roach, brown-hooded cockroach
Cryptocercus is a genus of wingless, wood-feeding cockroaches representing the sole member of family Cryptocercidae. These subsocial insects exhibit extended parental care and family-based social structure. The genus holds exceptional phylogenetic significance as the closest living relative to termites, sharing lignocellulose-digesting gut symbionts and providing key evidence for the evolutionary origin of termite eusociality from cockroach ancestors. Twelve described species inhabit temperate forests of North America and eastern Asia.
Cryptocercus punctulatus
brown-hooded cockroach, woodroach, wingless wood roach, eastern wood-eating cockroach
Cryptocercus punctulatus is a wingless, wood-feeding cockroach endemic to montane forests of the eastern United States. It is one of the few subsocial cockroach species, exhibiting extended biparental care of offspring over multiple years. The species harbors obligate cellulolytic flagellate symbionts in its hindgut, transferred to neonates through proctodeal trophallaxis by parents. Its life history—xylophagy, social behavior, and gut symbiosis—makes it a key model for understanding the evolutionary origins of termite eusociality.
Heterogastridae
Heterogastridae is a family of seed bugs in the superfamily Lygaeoidea, comprising approximately 20–23 genera and 97–100 species. The group has been variously classified as subfamily, tribe, and subtribe, but is currently recognized at family rank. Members possess a distinctive midgut M4 region with two rows of crypts housing Caballeronia bacterial symbionts, representing a stable and specific mutualistic association. The family forms a basal lineage of Lygaeoidea alongside Pachygronthidae.