Cold-tolerance
Guides
Cucujus
flat bark beetles
Cucujus is a genus of flat bark beetles in the family Cucujidae, containing approximately 25 recognized species distributed across the Holarctic region. Species are dorso-ventrally compressed, brightly colored in red or red-and-black patterns, and range from 6–25 mm in length. The genus is most diverse in Asia, with indigenous species in North America, Europe, and Asia. Several species, notably C. cinnaberinus and C. clavipes, have been subjects of ecological and physiological research due to their conservation status and extreme cold tolerance adaptations.
Cucujus puniceus
Red Flat Bark Beetle
Cucujus puniceus is a species of flat bark beetle in the family Cucujidae, distributed across northern North America. The species has been extensively studied for its exceptional cold tolerance mechanisms. Larvae survive winter temperatures through deep supercooling and vitrification, with documented survival to at least –100°C. The species is treated as a synonym of Cucujus clavipes by some authorities, or as a distinct species or subspecies by others.
Entomobrya nivalis
Cosmopolitan Springtail
Entomobrya nivalis, commonly known as the cosmopolitan springtail, is a globally distributed species of slender springtail in the family Entomobryidae. Adults measure approximately 2 mm in length and display distinctive coloration with dark transverse bands on a yellow or white background. The species is notable for its cold tolerance, facilitated by antifreeze compounds in its hemolymph, enabling survival in temperate and polar regions. Juveniles inhabit leaf litter while adults migrate to lichen-covered tree bark.
Hyles euphorbiae
spurge hawk-moth, Leafy Spurge Hawkmoth
Hyles euphorbiae, the spurge hawk-moth, is a European hawkmoth in the family Sphingidae. First described by Linnaeus in 1758, this species is notable for its use in biological pest control against leafy spurge (Euphorbia esula). The species comprises a complex with multiple ecotypes showing variation in cold tolerance and larval pattern morphology across its range. Adults are strong fliers with distinctive wing patterns, while larvae feed on spurge plants and display conspicuous black, white, and red coloration.
Ilybius oblitus
Ilybius oblitus is a predaceous diving beetle in the family Dytiscidae, first described by Sharp in 1882. It occurs in North America, with confirmed records from Ontario, Canada. The species has been documented to tolerate low temperatures, though it remains susceptible to freezing. Observations of this species are sparse, with limited biological data available.
Megabruchidius dorsalis
honey locust seed beetle, Asian seed beetle
Megabruchidius dorsalis is an invasive seed beetle (Chrysomelidae: Bruchinae) native to Asia that has established populations across Europe and North America. The species is oligophagous on Caesalpinioideae seeds, primarily developing within pods of Gleditsia species. Adults exhibit freeze-avoidant cold tolerance strategy with supercooling points around -10°C. The beetle has demonstrated host range expansion in its introduced range, colonizing North American Gymnocladus dioica in addition to its native Asian Gleditsia hosts.
Myllocerus
oriental broad-nosed weevils, ash weevils, grey weevils, Sri Lankan weevils
Myllocerus is a large genus of oriental broad-nosed weevils in the family Curculionidae, comprising at least 330 described species. Species within this genus are predominantly distributed across the Indian subcontinent and surrounding regions, with several species recognized as significant agricultural pests. Notable pest species include Myllocerus undecimpustulatus undatus (Sri Lankan weevil), M. maculosus (cotton grey weevil), and M. viridanus (ash weevil), which attack diverse crop plants including cereals, legumes, vegetables, and fruit trees. The genus exhibits typical weevil morphology with broad rostrums and root-feeding larval stages combined with foliage-feeding adults.
Myllocerus undecimpustulatus
Sri Lanka weevil, yellow-headed ravenous weevil
Myllocerus undecimpustulatus is an oriental broad-nosed weevil (Curculionidae: Entiminae) native to Sri Lanka and the Indian subcontinent. It is a polyphagous pest with a wide host range that has established invasive populations in Florida, USA, since at least 2000. The species exhibits distinctive sexual behavior including female abdominal rocking as a mate-strength test and prolonged copulatory guarding by males. It shows seasonal variation in cold tolerance and feeding activity, with winter-collected adults consuming more leaf material after cold exposure than summer-collected individuals.
Myllocerus undecimpustulatus undatus
Sri Lankan weevil
Myllocerus undecimpustulatus undatus, the Sri Lankan weevil, is a polyphagous curculionid pest native to Sri Lanka that has spread to India, Pakistan, and the United States. It was first identified in Florida in 2000 on Citrus species and has since established populations in the state. The species exhibits sexual dimorphism with females typically larger than males. Research has documented its cold tolerance limitations, mating behavior involving female abdominal rocking and prolonged copulatory guarding, and susceptibility to certain biopesticides.
Periplaneta japonica
Japanese cockroach, Yamato cockroach
Periplaneta japonica is a cold-tolerant cockroach native to Japan, adapted to cooler northern climates. It possesses a flexible life cycle with facultative nymphal diapause, allowing nymphs to overwinter once or twice before reaching maturity. The species produces a unique viscous proteinaceous secretion in nymphs that enables active defense against ant predators. First documented in the United States in 2012 in New York City, it has been observed to survive outdoors in freezing temperatures, distinguishing it from most urban cockroach pests.
Phragmatobia fuliginosa
Ruby Tiger, Ruby Tiger Moth
Phragmatobia fuliginosa, the Ruby Tiger, is a moth in the subfamily Arctiinae of family Erebidae. It has a wingspan of 35–45 mm and is distinguished by dark reddish-brown forewings with a blackish comma-shaped spot and bright carmine to rose-red hindwings. The species is widely distributed across the Palearctic and into northern North America, with multiple recognized subspecies including the North American P. f. rubricosa. It exhibits geographic variation in generation time: univoltine in northern regions with adults flying in June, and bivoltine in southern Britain with adults appearing April–June and again August–September.
Protophormia terraenovae
northern blowfly, blue-bottle fly, blue-assed fly, blackbottle
Protophormia terraenovae is a large, metallic blue-green blowfly with a Holarctic distribution. It is the most cold-tolerant calliphorid species, occurring from the Arctic to temperate regions. The species is economically significant as a cause of myiasis in livestock and valuable in maggot debridement therapy due to its selective consumption of necrotic tissue and antibiotic secretions. Its temperature-dependent development makes it a key forensic indicator for post-mortem interval estimation.
Pytho americanus
dead log beetle
Pytho americanus is a species of dead log beetle in the family Pythidae. It is native to North America, with records from Canada and the northern United States. The species exhibits notable cold tolerance adaptations, including the ability to overwinter in both larval and adult stages and the synthesis of glycerol during cold acclimation. These physiological traits allow it to persist in climates with severe winter conditions.
Trichonephila clavata
Jorō spider, Joro Spider, Parachute spider
Trichonephila clavata, commonly known as the Jorō spider, is a large orb-weaving spider native to East Asia that has become established as an invasive species in the southeastern United States since approximately 2010. First confirmed in Georgia in 2014, it has expanded rapidly across multiple states through a combination of ballooning dispersal and human-mediated transport. The species is notable for its substantial size, striking coloration, and extensive golden webs, but poses minimal risk to humans due to small fangs and docile behavior. Its physiological adaptations—including higher metabolic rate, faster heart rate, and greater cold tolerance than its congener Trichonephila clavipes—suggest potential for continued northward range expansion.