Hygropetric
Guides
Dactylolabis hudsonica
Dactylolabis hudsonica is a crane fly species in the family Limoniidae. It inhabits madicolous environments—thin water films on vertical or overhanging rock surfaces—in eastern North America. The species was described by Alexander in 1931. Its larval and pupal stages have been documented, and larvae can be distinguished from the related D. montana using morphological characters.
Dactylolabis montana
Dactylolabis montana is a species of limoniid crane fly inhabiting madicolous environments in eastern North America. The species develops in thin water films on rock surfaces, with distinct larval and pupal stages described. It occurs from Ontario and Newfoundland south to Kansas, Arkansas, Mississippi, Tennessee, and South Carolina.
Elliptera
Elliptera is a genus of crane flies in the family Limoniidae, established by Schiner in 1863. The genus comprises ten described species distributed across the Holarctic region, including North America, Europe, and East Asia. Immature stages have been described for only a few species, with larvae inhabiting aquatic, hygropetric environments on wet rocks in mountainous areas.
Hydroscaphidae
skiff beetles
Hydroscaphidae is a small family of water beetles in the suborder Myxophaga, commonly known as skiff beetles. The family contains approximately 23 species as of 2010, distributed across four genera. These beetles are highly specialized for life in thin films of water over algal surfaces.
Lutrochidae
Travertine Beetles
Lutrochidae is a small family of aquatic beetles commonly known as travertine beetles. The family has been reported from hygropetric habitats for the first time in Venezuela, expanding beyond their previously known association with travertine-depositing springs and streams in North America. Species occur in the Americas from the United States through the Neotropics, with recent revisions documenting new species from Venezuela, the Guianas, and the Lesser Antilles.
Myxophaga
Minute Bog and Skiff Beetles
Myxophaga is a small suborder of Coleoptera comprising approximately 65 described species across four extant families: Lepiceridae, Hydroscaphidae, Sphaeriusidae, and Torridincolidae. These beetles are among the smallest in the order, ranging from small to minute in size. All members are aquatic or semiaquatic, with many species inhabiting hygropetric environments—thin water films on rock surfaces in running water. The suborder is characterized by distinctive morphological features including clubbed antennae with fewer than nine segments, open mesocoxal cavities, and apically rolled hind wings in resting position.
Ochthebius puncticollis
minute moss beetle
Ochthebius puncticollis is a species of minute moss beetle in the family Hydraenidae, first described by John Lawrence LeConte in 1852. This small beetle is known from arid and semi-arid regions of southwestern North America, with records from Arizona, California, and Utah in the United States, as well as Mexico. Like other members of its genus, it is associated with moist microhabitats in otherwise dry environments, typically inhabiting the margins of streams, springs, and seeps where moss and algae grow.
Orthocladius
Orthocladius is a genus of non-biting midges in the family Chironomidae. Larvae are aquatic and construct silk tubes that serve as microhabitats for associated microbial communities. The genus includes species adapted to diverse freshwater environments, including streams and hygropetric habitats.
Ptilodactylidae
Toe-winged Beetles
Ptilodactylidae is a family of approximately 500 extant species in 35 genera, commonly known as toe-winged beetles. The family belongs to the superfamily Dryopoidea within Elateriformia. Members are primarily associated with riparian and aquatic habitats, with larvae typically found in rotting wood, vegetation, or gravel and detritus at water margins. The family has a significant but underappreciated fossil record, including specimens preserved in Baltic, Dominican, Mexican, and Rovno amber dating from the Cretaceous through Eocene.
Tanytarsini
Tanytarsini is a diverse tribe of non-biting midges (Chironomidae: Chironominae) comprising over 20 genera and approximately 1,000 described species. The tribe is divided into two subtribes: Tanytarsina and Zavreliina. Members occupy a wide range of aquatic habitats including freshwater lotic and lentic systems, hygropetric seepages, and marine intertidal zones. The genus Pontomyia represents truly marine chironomids within this tribe, with specialized life history adaptations including flightless, larviform females and short-lived non-feeding adults.
Thaumaleidae
solitary midges, trickle midges, madicolous midges
Thaumaleidae is a family of small nematoceran flies in the order Diptera, closely related to Ceratopogonidae, Chironomidae, and Simuliidae. Adults are non-feeding, stocky, yellow to brown flies measuring 3–4 mm, with short antennae no longer than the head. The family comprises approximately 202 extant species in seven genera (Afrothaumalea, Androprosopa, Austrothaumalea, Neothaumalea, Niphta, Thaumalea, Trichothaumalea) plus one fossil genus. Larvae inhabit thin water films on rock surfaces alongside waterfalls and torrents, where they graze on diatoms.