(redirected from cephalothoraxes)
Also found in: Dictionary, Medical.


(invertebrate zoology)
The body division comprising the united head and thorax of arachnids and higher crustaceans.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Table 1 shows the FA profiles of COF and TOF pleons and cephalothoraxes and of COF eggs.
Pleons had more palmitic and oleic acids than cephalothoraxes, while the latter had more DHA than the former, both in COFs and in TOFs.
COF pleons had more palmitic and erucic acids, while COF cephalothoraxes had more DHA (Table 2; Fig.
Eleven selected genes were detected using RT-PCR in the cephalothoraxes of female and male shrimp for primarily screening of sex markers and detected in each juvenile for further screening of sex markers, respectively.
As the selected 11 candidates were verified to be expressed either in AG-related tissues or in testis, both of which were located in the cephalothoraxes of shrimps, the cephalothoraxes of female and male grow-up stage shrimps were sampled to identify the genes expression in different sexes.