Forest-indicator
Guides
Aradus
flat bugs
Aradus is a genus of flat bugs (family Aradidae) containing approximately 200 or more species distributed worldwide, with highest diversity in the Holarctic region. These insects are strongly associated with forest habitats, particularly dead and decaying wood where they feed on fungi. Several species exhibit pyrophilous behavior, colonizing burned forests to exploit fungi that grow on charred wood. The genus has a documented fossil record extending back to the Eocene, with 14 species described from Baltic amber inclusions.
Ceruchus
Ceruchus is a genus of stag beetles in the family Lucanidae, established by Macleay in 1819. The genus comprises approximately 18–19 described species. Members are saproxylic beetles associated with decaying wood. At least one species, Ceruchus chrysomelinus, is an endangered relict of natural Central European montane forests.
Criorhinina
Criorhinina is a subtribe of hoverflies (family Syrphidae) within the tribe Milesiini and subfamily Eristalinae. Members are characterized by their association with decaying wood and sap flows, where larvae develop. The subtribe includes genera such as *Criorhina* and *Sphecomyia*, which are often large-bodied and mimic bumble bees or wasps. Adults are primarily found in forested habitats.
Eucnemidae
False Click Beetles
Eucnemidae, commonly known as false click beetles, is a family of elateroid beetles comprising approximately 1,700 species distributed worldwide. The family is closely related to Elateridae (true click beetles) and shares the ability to produce an audible clicking sound through a prosternal-mesosternal mechanism, though this trait is less pronounced than in true click beetles. Larvae are saproxylic, developing in decaying wood where they feed on fungal fluids using specialized digestive adaptations. Adults are typically short-lived and frequently observed on broken wood surfaces.
Exenterus amictorius
Exenterus amictorius is an ichneumonid parasitoid wasp introduced to North America that attacks sawfly larvae (Hymenoptera: Diprionidae), particularly during the pre-spinning eonymph stage. The species exhibits adaptive host discrimination behavior that changes during the host's spinning period, lacks discrimination initially but rapidly acquires and maintains this ability. It shows strong positive density-dependent responses to host abundance and has established successfully on multiple diprionid hosts across North America. In multiparasitism situations with the native E. diprionis, E. amictorius consistently survives due to faster larval development.
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flower longhorns
Lepturini is a tribe of flower longhorn beetles (Cerambycidae: Lepturinae) characterized by adults that frequently visit flowers for pollen feeding. The tribe contains numerous genera distributed across forested and semi-open habitats in the Northern Hemisphere, with some representatives in South America. Larvae develop primarily in woody plants, where they contribute to dead wood decomposition. Adult activity is strongly seasonal and diurnal, with peak flight periods typically occurring in late spring to early summer.
Platycerus
Platycerus is a genus of small stag beetles in the family Lucanidae, comprising over 50 species distributed across deciduous forests of the Northern Hemisphere. Members are saproxylic, developing in deadwood of cool, temperate broadleaf forests. Adults are elusive with short flight periods and cryptic habits, making them generally uncommon and locally rare in many regions.
Rhyssinae
Rhyssinae is a subfamily of parasitoid wasps within Ichneumonidae, comprising approximately 450 described species across eight genera worldwide. Members are characterized by extremely long ovipositors used by females to drill into wood and parasitize larvae of wood-boring insects, particularly Siricidae (woodwasps) and wood-boring beetles. The subfamily shows highest species diversity in the Oriental region, with significant representation in tropical forests of South America and Africa. Fossil evidence dates the subfamily to the Eocene, approximately 47 million years ago.
Rugilus
Rugilus is a genus of rove beetles (Staphylinidae) established by Leach in 1819. It represents one of the major genera within the subfamily Paederinae. The genus contains multiple species distributed across Europe, with some members considered rare and associated with specific forest habitats.