cephalothorax

American  

[sef-uh-loh-thawr-aks, -thohr-] / ˌsɛf ə loʊˈθɔr æks, -ˈθoʊr- /

noun

Zoology.

plural

cephalothoraxes, cephalothoraces

1. the anterior part of the body in certain arachnids and crustaceans, consisting of the coalesced head and thorax.

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cephalothorax British  

/ ˌsɛfələʊθəˈræsɪk, ˌsɛfələʊˈθɔːræks /

noun

1. the anterior part of many crustaceans and some other arthropods consisting of a united head and thorax

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cephalothorax Scientific  

/ sĕf′ə-lə-thôr′ăks′ /

1. The combined head and thorax of arachnids, such as spiders, and of many crustaceans, such as crabs.

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Other Word Forms

• cephalothoracic adjective

Etymology

Origin of cephalothorax

First recorded in 1825–35; cephalo- + thorax

Example Sentences

"The abdomen and cephalothorax of spiders are closely attached, while in ants the equivalent of these body parts are separated by a narrow segment called the petiole," Poinar said.

From Science Daily • Mar. 22, 2024

An illustration of a midsagittal cross section of a crayfish shows the carapace around the cephalothorax, and the heart in the dorsal thorax area.

From Textbooks • Jan. 1, 2015

Tagma may be in the form of a head, thorax, and abdomen, or a cephalothorax and abdomen, or a head and trunk.

From Textbooks • Jan. 1, 2015

Fused segments may form a head, thorax, and abdomen, or a cephalothorax and abdomen, or a head and trunk.

From Textbooks • Apr. 25, 2013

The abdomen fits closely over the cephalothorax, and the epidermis, which has usually a metallic lustre, is sometimes coriaceous.

From A Book of Natural History Young Folks' Library Volume XIV. by Jordan, David Starr