Corixoidea

Corixoidea can be distinguished from other Nepomorpha superfamilies by the combination of: (1) antennae typically small and concealed beneath the head (not visible from above), (2) presence of five main types of antennal sensilla including sensilla trichodea, campaniformia, basiconica, coeloconica, and ampullacea, and (3) aquatic lifestyle with swimming adaptations. Within the superfamily, Micronectidae differs from Corixidae in lacking sensilla coeloconica on the third antennomere and showing differences in sensilla presence on the first and second antennomeres. Male genitalic structures provide species-level diagnostic characters and are frequently illustrated with scanning electron microscopy in taxonomic revisions.

Exclusively freshwater aquatic environments including ponds, slow-moving streams, and water reservoirs. Members swim near the bottom of water bodies. Some species undertake migration to new water bodies, a behavior linked to thermo-hygroreceptive sensilla function.

Worldwide distribution with strong representation in Australasia (Australia, New Guinea, Solomon Islands, Fiji), Asia (including Turkey's Southeastern Anatolia region, South Korea), and other regions. Specific documented distributions include: continental Australia (with range extensions for multiple Micronectidae species across Western Australia, Queensland, New South Wales, South Australia, Northern Territory), New Guinea, Solomon Islands, and Fiji.

Feeding strategies vary by family and species. Corixidae exhibit three main patterns: ambush predation (e.g., Cymatia), pelagic predation (e.g., Glaenocorisa), and benthic omnivory (e.g., Sigara, Micronecta). Many species are detritivores or organic scrapers. Specific diet information for Micronectidae is less documented but includes similar benthic feeding.

Antennae are small and concealed beneath the head, bearing mechanoreceptive sensilla that detect water vibrations for orientation in low-visibility aquatic environments. Chemoreceptive sensilla aid in predator avoidance and foraging. Thermo-hygroreceptive sensilla are important for detecting conditions that trigger migration to new water bodies. Migration behavior has been observed in Corixidae.

Primarily detritivores and organic scrapers that contribute to nutrient cycling in freshwater ecosystems. Some species function as predators (ambush or pelagic), potentially regulating populations of smaller aquatic organisms. Benthic omnivores occupy important positions in food webs as both consumers and prey for larger aquatic predators.

• NotonectoideaBoth are superfamilies within Nepomorpha containing aquatic bugs; distinguished by Notonectidae (backswimmers) swimming upside down near the surface with visible antennae, versus Corixoidea swimming right-side up near the bottom with concealed antennae
• GerroideaSuperficially similar aquatic Heteroptera but members of Gerroidea (water striders) are surface-dwelling with long legs for skating, not submerged swimmers like Corixoidea

• Nepomorpha
• aquatic insects
• freshwater
• Hemiptera
• Heteroptera
• water boatmen
• Micronectidae
• Corixidae
• antennal sensilla
• detritivory
• predation
• Australasia
• systematics
• SEM morphology
• zoogeography

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• Catalogue of Life
• Comparative Study of Antennal Sensilla of Corixidae and Micronectidae (Hemiptera: Heteroptera: Nepomorpha: Corixoidea)
• Taxonomic revision and systematics of continental Australian pygmy water boatmen (Hemiptera: Heteroptera: Corixoidea: Micronectidae)
• Taxonomic revision and systematics of New Guinea and Oceania pygmy water boatmen (Hemiptera: Heteroptera: Corixoidea: Micronectidae)
• Southeastern Anatolia region insect fauna II (Order Hemiptera I: Suborder Heteroptera I: Gerroidea, Hebroidea, Corixoidea, Notonectoidea, Leptopodoidea, Cimicoidea, Naboidea, Mirioidea) of Turkey
• First report Xenocorixa vittipennis (Horváth) (Hemiptera, Corixoidea, Corixidae) from South Korea and checklist of the Korean Corixoidea.