Vitrification
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 clavipes
Red Flat Bark Beetle, Flat Bark Beetle
Cucujus clavipes, the red flat bark beetle, is a saproxylic beetle distributed across North America with two recognized subspecies: C. c. clavipes in the east and C. c. puniceus in the west. The species is notable for extreme cold tolerance, particularly in the western subspecies whose larvae can survive temperatures down to -100°C through deep supercooling and vitrification. Adults are active primarily in spring and summer and are found under bark of dead hardwood trees.
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.