Scorpion

Physical characteristics and senses

Scorpions have eight legs and two front appendages (pedipalps) used for seizing prey. The body is divided into a prosoma (head) and an opisthosoma (abdomen), the latter further split into a broad mesosoma and a narrow, tail-like metasoma carrying the venom gland and telson. Many species bear comb-like sensory organs called pectines on the underside, which aid in detecting textures and chemical cues. Their exoskeleton is chitinous and often pigmented, sometimes fluorescing under ultraviolet light.

Evolution, classification and distribution

Scorpions are an ancient lineage: fossil evidence extends back to the Silurian period, and they are among the earliest terrestrial arthropods. Modern scorpions are grouped into about 13 families, and they have adapted to deserts, grasslands, forests and caves. They occur on every continent except Antarctica, exploiting shelters such as burrows, rock crevices and leaf litter.

Behavior, diet and reproduction

Nocturnal hunters, scorpions feed on insects, spiders and small vertebrates. They use their pincers to capture prey and may inject venom with the sting to immobilize or digest it. Many species give birth to live young; newborns often ride on the mother's back until their first molt. Courtship involves a complex, species-specific dance during which the pair exchanges tactile and chemical signals.

• Venom and human risk: venoms are mixtures of neurotoxins and other compounds. Most scorpion stings cause pain and local symptoms; roughly two dozen species are known to have venom potent enough to be life-threatening to healthy adults.
• Medical care: severe envenomation can require antivenom and supportive treatment; children and the elderly are at greater risk of complications.
• Cultural and ecological roles: scorpions are both feared and respected in many cultures, and they help control insect populations.

For further reading on scorpion biology and taxonomy see resources on their ancient origin (Silurian fossils) and modern diversity. General guides and databases provide species lists and regional information for researchers and the public (species overview, venom reports, comparative anatomy). Visitors to scorpion habitats should respect local advice to avoid accidental stings and to appreciate these resilient arachnids without harm.