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Cephalochordata

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amphioxus

Overview page. Subjects: Biological Sciences.

Another name for the lancelet: see Cephalochordata.

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atrium

Overview page. Subjects: Medicine and Health — Science and Mathematics.

n. ( pl. atria) 1. either of the two upper chambers of the heart. Their muscular walls are thinner than those of the ventricles; the left atrium receives oxygenated...

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Branchiostomidae

Overview page. Subjects: Zoology and Animal Sciences.

; order Amphioxiformes)

A family of small, fish-like, marine, coastal animals. Lancelets are the only living representatives of the subphylum Cephalochordata. Although definitely...

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Chordata

Overview page. Subjects: Biological Sciences.

A phylum of animals characterized by a hollow dorsal nerve cord and, at some stage in their development, a flexible skeletal rod (the notochord) and gill slits opening from the pharynx....

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endostyle

Overview page. Subjects: Zoology and Animal Sciences.

A ciliated groove in the wall of the pharynx of lancelets (Cephalochordata), some tunicates, and larval lampreys that contains mucus-secreting glands. Mucus secreted by the endostyle traps...

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notochord

Overview page. Subjects: Biological Sciences.

An elastic skeletal rod lying lengthwise beneath the nerve cord and above the alimentary canal in the embryos or adults of all chordate animals (see Chordata). Its function is to strengthen...

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oligolecithal

Overview page. Subjects: Zoology and Animal Sciences.

Applied to an egg that has a little yolk, typical of Cephalochordata. Compare macrolecithal; mesolecithal. See also isolecithal; telolecithal.

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protochordate

Overview page. Subjects: Zoology and Animal Sciences.

A member of the invertebrate Chordata; the name is applied informally to all living and fossil chordates that lack skulls and vertebrae (including Cephalochordata and Urochordata).

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