Polytene-chromosomes
Guides
Chironomus
nonbiting midges, bloodworms
Chironomus is a genus of nonbiting midges in the family Chironomidae, containing over 200 species. Several species are cryptic and distinguishable only by experts using giant chromosome characteristics. The genus is notable for larvae that inhabit oxygen-poor aquatic sediments, using hemoglobin-like proteins to survive in hypoxic conditions. Adults are recognized by their habit of raising and vibrating their front legs when at rest—a behavior that inspired the genus name derived from Greek 'cheironomos' meaning 'one who moves the hands'.
Chironomus atrella
Chironomus atrella is a non-biting midge species in the family Chironomidae, studied primarily through cytogenetic analysis of its polytene chromosomes. Research has clarified taxonomic confusion surrounding this name, which had been applied to at least two distinct species. Populations across North America show moderate to high chromosomal polymorphism, with heterozygosity ranging from 0.36 to 0.92 in different habitats. The species has been documented in both shallow freshwater environments and tidal coves.
Ectemnia invenusta
unattractive black fly
Ectemnia invenusta is a species of black fly in the family Simuliidae, characterized by autapomorphic structural and behavioral traits that distinguish it from other black fly genera. The species is primarily northern in distribution and its immature stages occupy rocky rivers. It has been studied for its distinctive cocoon-spinning behavior, which provides phylogenetically informative characters linking it to other black fly taxa.