Bittacus

Distinguished from other Mecoptera by the combination of hanging behavior using modified forelegs and raptorial mid- and hindlegs. Separated from crane flies (Tipulidae) by presence of two full pairs of wings (crane flies have one pair plus halteres), raptorial leg modifications, and chewing mouthparts. Distinguished from other Bittacidae genera by specific wing venation patterns and genitalic characters requiring microscopic examination; the genus is currently paraphyletic and awaits taxonomic revision.

Elongate-bodied insects with extremely long, slender legs. Forelegs modified for grasping vegetation, lacking tarsal claws, used exclusively for hanging. Mid- and hindlegs bear tarsal claws and are raptorial, adapted for seizing prey. Two pairs of membranous wings of approximately equal size, with dark mottled patterning. Mouthparts modified for chewing. Overall body form superficially resembles crane flies (Tipulidae) but distinguished by leg morphology and wing venation.

Vegetation in forested and semi-forested environments where individuals can hang from leaves and stems. Specific microhabitat preferences vary by species; Brazilian species occur in Amazonian rainforest and Atlantic forest formations.

Cosmopolitan distribution spanning North America, South America, Europe, Asia, Africa, and Australia. Documented from Brazil (18 species), Bolivia, Colombia, Mozambique, Japan, and other regions. Fossil species known from Burmese amber (Cenomanian, Late Cretaceous) and Baltic amber (Eocene).

Arthropod prey captured using raptorial legs. Males of at least some species capture prey items to present as nuptial gifts to females.

Complete metamorphosis with egg, larva, pupa, and adult stages. Larvae of Bittacus choui have been described and are campodeiform (elongate, active, with distinct thoracic legs).

Adults hang from vegetation using modified forelegs, leaving remaining legs free for prey capture. Males engage in nuptial feeding: capturing arthropod prey and presenting it to females prior to copulation. Females assess prey quality and may reject small prey items; larger prey increases female receptivity and copulation duration. Males discriminate among females based on size, preferring larger females. This demonstrates mutual mate choice and sexual selection through both intrasexual competition and intersexual selection.

Predators of small arthropods. Nuptial feeding behavior may influence nutrient transfer to females and potentially affect egg production.

Subject of behavioral ecological research, particularly regarding sexual selection and nuptial feeding. No documented economic importance or pest status.

• HylobittacusAnother Bittacidae genus; distinguished by wing venation and genitalic characters, though Bittacus is paraphyletic with respect to it
• Tipulidae (crane flies)Superficially similar elongated body and long legs, but crane flies have only one pair of functional wings (plus halteres), lack raptorial leg modifications, and have siphonate rather than chewing mouthparts

• hangingfly
• Mecoptera
• nuptial feeding
• sexual selection
• raptorial legs
• paraphyletic genus

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• The Biology of Bittacus Stigmaterus Say (Mecoptera, Bittacusidæ).*
• The distribution and biology of Bittacus tjederi Londt, 1970 (Mecoptera: Bittacidae)
• Sexual Selection and Nuptial Feeding Behavior in Bittacus apicalis (Insecta: Mecoptera)
• On the Copulatory Behaviour of the Hanging Fly Bittacus italicus (Mecoptera: Bittacidae)
• One new species of hangingfly from Bolivia,Bittacus vazdemelloisp. nov. (Mecoptera: Bittacidae), with an identification key to South American species ofBittacusLatreille
• Supplementary material 1 from: He L-L, Miao Y, Wang H-H, Zhang J, Hua B-Z (2025) Dynamic meiotic behavior and evolutionary insights of supernumerary B chromosomes in the hangingfly Bittacus cirratus (Mecoptera, Bittacidae). Comparative Cytogenetics 19: 91-107. https://doi.org/10.3897/compcytogen.19.153340
• Sexually Selected Predatory and Mating Behavior of the Hangingfly, Bittacus stigmaterus (Mecoptera: Bittacidae)
• Hunting and Mating Behavior in the Japanese Hangingfly Bittacus mastrillii (Mecoptera: Bittacidae)
• Notes on the Bittacus (Mecoptera, Bittacidae) of Mozambique, with the description of a new species
• Cytogenetic comparison between Terrobittacus implicatus and Bittacus planus (Mecoptera: Bittacidae) with some phylogenetic implications
• Variation in Hunting and Mating Behavior in Two Populations of the Japanese Hangingfly Bittacus mastrillii (Mecoptera: Bittacidae)
• Morphology of immature stages ofBittacus choui(Mecoptera: Bittacidae) with notes on its biology
• A new species of Bittacus Latreille (Mecoptera: Bittacidae) from the Andean-Amazonian foothills, Caquetá, Colombia
• The genus Bittacus Latreille (Insecta: Mecoptera) in Brazil: key to species, distribution maps, new synonym, and three new species
• Dynamic meiotic behavior and evolutionary insights of supernumerary B chromosomes in the hangingfly Bittacuscirratus (Mecoptera, Bittacidae).