Nepomorpha

true water bugs, water bugs

Infraorder Guides

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is an infraorder of aquatic true bugs (Hemiptera: Heteroptera) comprising approximately 2,000 worldwide. Members are characterized by reduced, weakly muscled typically concealed against the , and absent or ocelli. Most species inhabit freshwater environments, with the exception of the superfamily Ochteroidea, which occupies riparian zones along water margins. The group includes diverse forms such as giant water bugs, water scorpions, water boatmen, and backswimmers.

Corixidae by (c) Henrique Pacheco, some rights reserved (CC BY), uploaded by Henrique Pacheco. Used under a CC-BY license.Pelocoris biimpressus shoshone by (c) Matthew Pintar, some rights reserved (CC BY), uploaded by Matthew Pintar. Used under a CC-BY license.Pelocoris biimpressus biimpressus by (c) Matthew Pintar, some rights reserved (CC BY), uploaded by Matthew Pintar. Used under a CC-BY license.

Pronunciation

How to pronounce Nepomorpha: //nɛpəˈmɔrfə//

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Identification

Distinguished from other Heteroptera by missing or ocelli and reduced with weak musculature, typically carried tucked against the rather than visible externally.

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Habitat

Predominantly freshwater aquatic environments including lakes, ponds, streams, and rivers. Members of the superfamily Ochteroidea are exceptional, occurring along water margins rather than submerged. Some Naucoridae inhabit running streams and waterfalls.

Distribution

Worldwide distribution excluding polar regions. Documented from North and Central America, South America, Europe, Africa, Asia, and oceanic islands including the Canary Islands.

Diet

Predominantly predatory, feeding on and in some cases small fish and amphibians. such as Belostomatidae and Nepidae include capable of capturing vertebrate prey. Some species are or herbivorous. Corixidae possess modified mouthparts enabling limited chewing of food in addition to fluid feeding.

Life Cycle

Hemimetabolous development without pupal stage; nymphs resemble and differ primarily in size, wing development, and sexual maturity. Aquatic respiration occurs through various mechanisms including air bubbles stored under wings (e.g., Ambrysus) or respiration using specialized setae (e.g., Procryphocricos).

Behavior

Many cling to substrates in flowing water using powerful claws. Defensive biting with the rostrum has been documented, with some species such as Notonecta glauca capable of delivering painful stings to humans.

Ecological Role

in freshwater ; some serve as indicators of water quality and health. Changes in nepomorphan have been used to assess impacts of dam removal and restoration.

Human Relevance

Some larger can inflict painful defensive bites. Giant water bugs (Belostomatidae) and backswimmers (Notonectidae) are known for bites more painful than stings. Several are studied as bioindicators for aquatic monitoring.

Similar Taxa

  • GerromorphaBoth are aquatic/semi-aquatic infraorders within Heteroptera, but Gerromorpha (water striders, water measurers) inhabit water surfaces rather than submerged environments and possess visible, well-developed unlike the reduced, concealed antennae of .

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