Flagellum
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.
Palpigradi
microwhip scorpion, palpigrade, micro whipscorpion
Palpigradi is an order of minute arachnids, commonly called microwhip scorpions or palpigrades. They are the sister group to Solifugae (camel spiders), measuring 1–3 mm in length. These pale, thin-bodied arachnids inhabit wet tropical and subtropical soils worldwide, living interstitially in moist microhabitats under stones and in caves. They possess a distinctive multi-segmented flagellum that may comprise half the body length. The order contains two families, Prokoeneniidae and Eukoeneniidae, distinguished by the presence or absence of ventral respiratory sacs.