Heterelmis obscura
Sharp, 1882
Heterelmis obscura is a of riffle beetle in the Elmidae, first described by Sharp in 1882. It inhabits freshwater environments in Central and South America. Like other elmid beetles, it is fully aquatic throughout its , with possessing a —a layer of air trapped by body hairs that enables underwater respiration.
Pronunciation
How to pronounce Heterelmis obscura: /ˌhɛtɛˈrɛlmɪs əbˈskjʊrə/
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Habitat
Freshwater aquatic environments, specifically riffles—areas of streams and rivers where water flows rapidly over rocky substrates. These provide high oxygen levels necessary for respiration and offer crevices for shelter.
Distribution
Central America and South America. GBIF records confirm presence in Middle America and South America.
More Details
Taxonomic note
The Heterelmis contains multiple , including the endangered Heterelmis comalensis (Comal Springs riffle beetle) from Texas, USA. Heterelmis obscura is distinct from this North American species and has not been assessed for conservation status.
Aquatic adaptations
As with all riffle beetles in Elmidae, Heterelmis obscura is obligately aquatic. respire underwater using a —a physical gill formed by air held in place by hydrofuge hairs on the body surface, allowing with dissolved oxygen in the water.