Name: Scorpions.
Meaning: From skorpios (Greek).
Grouping: Arthropod, Chelicerate, Arachnid, Scorpion.
Informal ID: Scorpion.
Fossil size: More complete specimen (far right). head-tail length 1.4cm/~in.
Reconstructed size: The group vanes from head-tail length less than 1cm/ in to almost 1m/3 ft - larger forms were aquatic.
Habitats: Variable, generally warm, including deserts, forests, grasslands, marine intertidal; many Palaeozoic types were aquatic.
Time span: Middle Silurian, 420 million years ago, to today.
Main fossil sites: Worldwide.
Occurrence: •