Gerridae

Leach, 1815

water striders, water bugs, pond skaters, water skippers, Jesus bugs, water skeeters, water scooters, water gliders, water skimmers, puddle flies

Subfamily Guides

4

are a of true bugs (Hemiptera: Heteroptera) renowned for their ability to walk on water. They possess hydrofuge hairpiles covering the body and specialized leg structures that exploit water surface tension. Most inhabit freshwater, though the Halobates is exceptional as the only truly oceanic insect, living on open ocean surfaces. Over 1,700 species have been described, with body lengths ranging from 2–36 mm. They are predatory, feeding on surface-trapped .

Limnogonus franciscanus by (c) Matthew Pintar, some rights reserved (CC BY), uploaded by Matthew Pintar. Used under a CC-BY license.Trepobates becki by (c) Matthew Pintar, some rights reserved (CC BY), uploaded by Matthew Pintar. Used under a CC-BY license.Rheumatobates palosi by (c) Matthew Pintar, some rights reserved (CC BY), uploaded by Matthew Pintar. Used under a CC-BY license.

Pronunciation

How to pronounce Gerridae: //ˈd͡ʒɛrɪdiː//

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

are distinguished from other surface-dwelling insects by their elongated, slender body form and extremely long, thin legs adapted for distributing weight across the water surface. The middle legs are typically longest and used for propulsion, while hind legs steer. Front legs are shortest with preapical claws adapted for grasping prey. The body is covered in dense hydrofuge hairs (over 1,000 microhairs per mm²) that repel water. have four segments, with segment I longer and stockier than segments II–IV. Wing is common: some are fully winged, others wingless, and some dimorphic.

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Habitat

Primarily freshwater surfaces including ponds, lakes, rivers, and streams. Approximately 90% of are freshwater-dwelling. A few (Halobates, Asclepios, Stenobates) inhabit marine environments; Halobates species are the only insects known to live on the open ocean surface. Preferred water temperatures are around 25°C; temperatures below 22°C slow development. range from small temporary pools to large permanent lakes.

Distribution

Worldwide in tropical and temperate regions. Prominent occur in Europe, North America (Canada, US), South America, South Africa, Australia, China, and Malaysia. Halobates oceanic are distributed across Pacific, Atlantic, and Indian Oceans. Coastal marine species occur in Indo-Pacific region. Not recorded from New Zealand.

Seasonality

Active year-round in tropical regions. In temperate zones with seasonal climates, active during warm months; overwinter in leaf litter or under logs/rocks. individuals are typically (winged) to allow return to aquatic after winter. occurs throughout the year in tropics, only during warm months in seasonal habitats.

Diet

Predatory; feed on that fall onto or are trapped at the water surface, primarily spiders and insects. Prey is detected by vibrations sensed through the front legs. Prey is punctured with and digestive injected to liquefy internal tissues, which are then sucked out. Halobates feeds on zooplankton, fish , and floating insects; occasionally cannibalizes nymphs. Some collect sediment or deposits from surfaces.

Life Cycle

laid on submerged rocks or vegetation, attached with gelatinous glue. Gravid females carry 2–20 eggs. Eggs are creamy white or translucent, becoming bright orange. Development: egg stage, five nymphal instars (each 7–10 days), then . Total development time approximately 60–70 days, highly temperature-dependent. Nymphs resemble smaller, paler adults lacking differentiated tarsal and genital segments; they through a Y-shaped .

Behavior

Locomotion relies on surface tension: middle legs press down and backward to create semicircular surface waves, using wave crests for forward propulsion at speeds up to 1 m/s. Hind legs steer. Territorial; both sexes defend areas using vibration signals through water surface. Mating involves male-produced ripple frequencies: 25 Hz (repel), 10 Hz (threat), 3 Hz (courtship). Males guard females post-mating to ensure paternity. occurs, particularly on nymphs, helping regulate . Winged forms disperse when become crowded or dry.

Ecological Role

in freshwater and marine neuston , controlling of surface-trapped arthropods. Important food source for birds, fish, frogs, and other aquatic predators. Contribute to nutrient cycling at air-water interface. Halobates is the top insect predator in open ocean surface .

Human Relevance

Popular in entomological education due to visible surface- . Featured in video games (Super Mario 64), films (The Tuxedo), and Pokémon (Surskit). Used in scientific research on surface physics, locomotion biomechanics, and evolution of wing . Some used as indicators of water quality. No significant agricultural or medical importance.

Similar Taxa

  • VeliidaeSmaller water striders with shorter legs relative to body; often found in more turbulent waters or along shorelines rather than open water surfaces.
  • NotonectidaeBackswimmers swim underwater rather than on surface; side up when swimming; shorter, oar-like hind legs for underwater propulsion.
  • HydrometridaeWater measurers have more elongated, stick-like bodies and move slowly by rather than skating; feed on dead insects rather than active .

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