Xylophagy
Guides
Blattoidea
Typical Cockroaches and Termites
Blattoidea is a superfamily within the order Blattodea encompassing cockroaches and termites. It comprises approximately 17 families and over 4,100 described species. The superfamily includes two major epifamilies: Blattoidae (typical cockroaches), Cryptocercoidae (brown-hooded cockroaches), and Termitoidae (termites). Molecular phylogenetic studies have clarified relationships among major lineages, though subfamilial classifications remain under revision.
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.
Lara avara
riffle beetle
Lara avara is a xylophagous riffle beetle in the family Elmidae. It inhabits freshwater streams in western North America, where larvae feed on submerged decaying wood. The life cycle spans 4–6 years, with extended larval development and brief adult emergence from May to August. The species contributes to aquatic wood decomposition through larval feeding and fecal production.
Micromalthidae
Telephone-pole Beetles
Micromalthidae is an ancient, relictual family of beetles in the suborder Archostemata, represented today by a single extant species, Micromalthus debilis. The family has a fossil record extending to the Late Permian (approximately 260 million years ago), making it one of the oldest surviving beetle lineages. Members are characterized by highly unusual reproductive biology, including paedogenesis (reproduction by larvae) and parthenogenesis. The family shows extreme morphological reduction in adults, particularly males, with larvae serving as the primary feeding and persistent life stage.