Hydrophiloidea
Guides
Georissidae
minute mud-loving beetles
Georissidae is a small family of beetles commonly known as minute mud-loving beetles, containing the single genus Georissus. Members are tiny insects typically found in wet soil and riparian environments near water. Some species have been documented in atypical habitats such as cloud forest leaf litter. The family exhibits notable morphological and behavioral diversity, including psammophory (sand adherence for camouflage) in some subgenera and aptery (winglessness) in certain species.
Georissus
minute mud-loving beetles
Georissus is the sole genus in the family Georissidae, comprising approximately 75 described species of minute beetles. Members are distinguished by their habit of psammophory—actively covering their elytra with sand or mud particles as a defensive adaptation. The genus exhibits notable ecological flexibility, with most species inhabiting riparian mud and sand, while some populations occupy tropical rainforest leaf litter and cloud forest terrestrial habitats. The genus is divided into three subgenera: Georissus, Neogeorissus, and Nipponogeorissus.
Helophorus oblongulus
Hydrochidae
Elongate Water Scavenger Beetles
Hydrochidae is a family of aquatic beetles in the order Coleoptera, containing a single genus Hydrochus with approximately 180–200+ species worldwide. These small elongate water scavenger beetles are found in freshwater habitats across multiple continents including Europe, Asia, Africa, and the Americas. The family is sometimes treated as the subfamily Hydrochinae within Hydrophilidae. Species-level taxonomy is well-developed, with recent revisions documenting substantial diversity in Central America (26 species), South America (77 species in Bolivia, Brazil, and Paraguay alone), and the Mediterranean region.
Hydrochus callosus
Hydrochus callosus is a species of water scavenger beetle in the family Hydrochidae, first described by John Lawrence LeConte in 1855. The species is found in the southeastern United States, with records from Alabama, Arkansas, Florida, Georgia, Louisiana, Mississippi, South Carolina, and Texas. Hydrochidae are small aquatic beetles typically associated with freshwater habitats.