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Chordata

(Encyclopedia)CE5 Common features in representative groups of the phylum Chordata Chordata kôrdāˈtə, –däˈ– [key], phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal ...

ascidian

(Encyclopedia)ascidian: see Chordata; tunicate. ...

bandicoot rat

(Encyclopedia)bandicoot rat, giant rat of southern Asia, unrelated to true bandicoots. It is an agricultural pest in the grain crops and gardens of India and Sri Lanka and is known for the piglike grunts it emits w...

paradise fish

(Encyclopedia)paradise fish, brilliantly colored freshwater Asian fish, Macropodus opercularis, often kept in aquariums. The males reach a length of 3 in. (7.6 cm) and turn reddish with blue bars during mating seas...

rudderfish

(Encyclopedia)rudderfish or sea chub, common name for members of the family Kyphosidae, small-mouthed fishes of warm seas throughout the world. Rudderfishes commonly follow vessels (whence their name), scavenging o...

hyrax

(Encyclopedia)hyrax hīˈrăks [key], name for rabbit-sized mammals of Africa and SW Asia comprising the family Procavidae. Although rodentlike in appearance, hyraxes are hoofed mammals, or ungulates (see Chordata)...

notochord

(Encyclopedia)notochord nōˈtəkôrdˌ [key], in biology, supporting rod running most of the length of animals of the phylum Chordata and present at varying times in the life cycle. Composed of large cells packed ...

cyclostome

(Encyclopedia)cyclostome sīˈkləstōmˌ [key], jawless fish, member of the vertebrate superclass Cyclostomata (see Chordata). This group includes the hagfish and the lamprey. ...

rook

(Encyclopedia)rook, term used for a common Eurasian bird (genus Corvus) of the family Corvidae (Crow family), smaller than the American crow. The jackdaw is a European species of the genus. Rooks nest in large colo...

elasmobranch

(Encyclopedia)elasmobranch ĭlăsˈməbrăngk [key], cartilaginous fish, member of the subclass Elasmobranchii of the vertebrate class Chondrichthyes (see Chordata). This group includes sharks, skates, and rays. ...