Pseudoscorpion
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Pseudoscorpions, also known as false scorpions or book scorpions, are small, scorpion-like arachnids belonging to the order Pseudoscorpiones, also known as Pseudoscorpionida or Chelonethida.
Phoretic pseudoscorpion (Lamprochernes sp.) on a fly, Germany
A book scorpion (Chelifer cancroides) on top of an open book
Example of pseudoscorpions preserved in amber. (a) Progonatemnus succineus, (b) Roncus succineus, (c) Chelignathus kochii, (d) Neobisium exstinctum, (e) Electrochelifer balticus, (f) Cheiridium hartmanni, (g) Geogarypus macrodactylus, (h) Microcreagris koellneri
Scorpion
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Scorpions are predatory arachnids with eight legs, a pair of grasping pincers and a narrow, segmented tail, often carried in a characteristic forward curve over the back and always ending with a sting
Fossil of Palaeophonus nuncius, a Silurian scorpion from Sweden
Ventral view: the pectines have a comblike structure in an inverted V shape.
Stinger of an Arizona bark scorpion