Nepidae
family of insects
Nepidae is a family of exclusively aquatic Heteropteran insects in the order Hemiptera. They are commonly called water scorpions for their superficial resemblance to scorpions, due to their raptorial forelegs and the presence of a long slender process at the posterior end of the abdomen, resembling a tail. There are 14 genera in the family, in two subfamilies, Nepinae and Ranatrinae. Members of the genus Ranatra, the most widespread and species-rich genus, are sometimes called needle bugs or water stick insects as they are slenderer than Nepa.
While water scorpions do not sting with their tail (it is used for breathing), they do have a painful bite (strictly speaking a sting by their pointed proboscis), but this is much less harmful to humans than a true scorpion's sting.
Distribution and habitat
Nepidae are found on all continents except Antarctica. They mostly inhabit stagnant or slow-moving freshwater habitats like ponds, marshes, canals and streams. Exceptionally they have also been recorded from hypersaline lakes and brackish lagoons, the Australian genus Goondnomdanepa is restricted to flowing waters, and Nepa anophthalma is adapted to life in caves in Romania.
Taxonomy
Nepidae has around 250 species in 14 genera divided into two subfamilies, Nepinae and Ranatrinae.
Among these the most diverse are the widespread Ranatra (about 100 species) and Laccotrephes (about 60), but the family also includes species-poor genera, like the Ethiopian Borborophilus, Nepella, Nepitella and Paranepa (each with one species), Indian Montonepa (one species), Philippine Borborophyes (one species), and Australian Austronepa (one species) and Goondnomdanepa (three species).
“Nepidae” enters the record as family of insects. Crown Archives preserves that source wording while asking what Nepidae, family and insects can confirm, complicate or overturn.
Why this record matters
“Nepidae” is worth following because a concise public description often conceals a longer documentary argument. Here, Nepidae, family and insects provides the most credible route into that argument.
The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Mar 15, 2026. The linked authority identifier is Q739585. None of the 0 selected statements returned an explicit reference.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Nepidae” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.