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The opisthosoma is the posterior portion of the arachnid
Arachnid

Arachnids are a class of Arthropod invertebrate animals in the subphylum Chelicerata. All arachnids have eight legs, but some exceptions are of some species having the first pair legs convert to sensory function and harvest mite larvae have only 3 pairs of legs....
s body behind the prosoma (cephalothorax). The number of segments and appendages on the opisthosoma vary. Scorpion
Scorpion

Scorpions are any arachnid of the order Scorpionida. They are members of the order Scorpiones within the class Arachnida. There are about 2,000 species of scorpions, found widely distributed south of about Latitude, except New Zealand and Antarctica....
s have 13, but the first is only seen during its embryological development. Other arachnids have twelve or less.






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Archindae Characters
The opisthosoma is the posterior portion of the arachnid
Arachnid

Arachnids are a class of Arthropod invertebrate animals in the subphylum Chelicerata. All arachnids have eight legs, but some exceptions are of some species having the first pair legs convert to sensory function and harvest mite larvae have only 3 pairs of legs....
s body behind the prosoma (cephalothorax). The number of segments and appendages on the opisthosoma vary. Scorpion
Scorpion

Scorpions are any arachnid of the order Scorpionida. They are members of the order Scorpiones within the class Arachnida. There are about 2,000 species of scorpions, found widely distributed south of about Latitude, except New Zealand and Antarctica....
s have 13, but the first is only seen during its embryological development. Other arachnids have twelve or less. In general, appendages are absent or reduced, although in horseshoe crab
Horseshoe crab

The horseshoe crab or Atlantic horseshoe crab is a marine chelicerate arthropod. Despite its name, it is more closely related to spiders, ticks, and scorpions than to crabs....
s they persist as large plate-like limbs, called opercula or branchiophores, bearing the book gills, and that function in locomotion and gas exchange. In most chelicerates the opisthosomal limbs are greatly reduced and persist only as specialized structures, such as the silk-producing spinneret
Spinneret

A spinneret is a spider spider silk-spinning organ . It is usually on the underside of a spider's abdomen, to the rear. Most spiders have six spinnerets; some have four or two....
s of spider
Spider

Spiders are air-breathing chelicerate arthropods that have eight legs, and chelicerae modified into fangs that inject venom. In their bodies the usual arthropod segments are fused into two Tagma , the cephalothorax and abdomen, joined by a small, cylindrical pedicel....
s or the pectines
Pectines

Pectines are peculiar appendages characteristic of the scorpions, which have derived from the first book gills of the Xiphosura. After detailed studies of their ennervations, it has been suggested that the pectines act as both mechanoreceptors and chemoreceptors....
 of scorpion
Scorpion

Scorpions are any arachnid of the order Scorpionida. They are members of the order Scorpiones within the class Arachnida. There are about 2,000 species of scorpions, found widely distributed south of about Latitude, except New Zealand and Antarctica....
s. In animals like whip scorpions and whip spiders the first two 'sternites' bearing the book lung
Book lung

A book lung is a type of respiration organ used for atmospheric gas exchange and is found in arachnids, such as scorpions and spiders. Each of these organs is found inside a ventral abdominal cavity and connects with the surroundings through a small opening....
s may actually be highly modified opisthosomal limbs.