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The prosoma of a canopy spider

The term prosoma ( Greek πρό pro 'before' and σῶμα soma 'body') refers to the fore part of arachnids . The eyes of the animals, their paired mouthparts (the chelicerae and pedipalps ) and the eight legs sit on it .

In contrast to the insects , whose body is divided into three tagmata  - caput (head), thorax (chest) and abdomen (abdomen) - arachnids have a two-part body structure: as the front body they have the prosoma, which corresponds to a head-chest piece, and the Abdomen (opisthosoma).

Occasionally the forelegs of arachnids are also referred to as the cephalothorax , but this is incorrect and only in the higher crustaceans is the fore-body called that, which is fused from the head ( cephalon ) and the chest ( thorax ), which is fused by the carapace extending from the head is covered.


Web links

Wiktionary: Cephalothorax  - explanations of meanings, word origins, synonyms, translations