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Cephalothorax

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cephalothorax [¦sef·ə·lə′thȯr‚aks]
(invertebrate zoology)
The body division comprising the united head and thorax of arachnids and higher crustaceans.
Cephalothorax 

that part of the body of arthropods formed as a result of the fusion of the cephalic and thoracic segments.

The cephalothorax is characteristic of higher crustaceans and chelicerate arthropods (Arachnida, Xiphosura, and the extinct paleozoic Eurypteridae). Among the crustaceans, the cephalothorax is formed in Decapoda by the fusion of six cephalic and seven thoracic segments. In Chelicerata it consists of the six front segments of the body (which usually bear the appendages), to which a seventh (pregenital) segment is sometimes attached.
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In Lepidaspis the cephalothorax consists of units whose basal plates are more or less fused (Dineley & Loeffler 1976), while in Oniscolepis the units are not fused.
Late Silurian--early Devonian tessellated heterostracan Oniscolepis ... by Marss, Tiiu; Karatajute-Talimaa, Valentina / Estonian Journal of Earth Sciences
Biometrics We measured the green lobster's cephalothorax or carapace length (CL) and abdomen or tail length (TL) to the nearest millimeter.
Population assessment of the pacific green spiny lobster Panulirus ... by Guzman, Hector M.; Cipriani, Roberto; Vega, Angel J.; Lopez, Melina; Mair, James M. / Journal of Shellfish Research
The total body length of adult copepods was measured from the beginning of the cephalothorax to the end of the caudal rami, without taking into account the caudal setae.
Effect of formalin preservation on the body length of ... by Pollupuu, Maria / Proceedings of the Estonian Academy of Sciences: Biology/Ecology
 
 
 
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