Book lung
Videos
A book lung is a type of respiration organ used for atmospheric gas exchange present in some arachnids such as scorpions and tetrapulmonates. It is a terrestrial adaptation of the book gills seen in a
In this spider diagram, the position of the book lungs is labelled 1.
Underside of female horseshoe crabs showing the legs and book gills
Pseudoscorpion
Videos
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