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脊索動物（せきさくどうぶつ、学名:Chordata）は、新口動物に属する動物の一群である。 概要 [ 編集 ] 魚類 ・ 両生類 ・ 爬虫類 ・ 鳥類 ・ 哺乳類 など背骨（ 脊椎 ）をもつ動物を含んだ 脊椎動物 と、それと近縁な動物群である 頭索動物 （ ナメクジウオ ...
Category. : Chordates. Wikimedia Commons has media related to Chordata. This category consists all articles on taxa at the subphyla and class levels in the Chordata phylum.
Cetacea ( / sɪˈteɪʃə /; from Latin cetus ' whale ', from Ancient Greek κῆτος ( kêtos) ' huge fish, sea monster ') [3] is an infraorder of aquatic mammals belonging to the order Artiodactyla that includes whales, dolphins, and porpoises. Key characteristics are their fully aquatic lifestyle, streamlined body shape, often large size ...
The blue whale (Balaenoptera musculus) is the largest animal that has ever lived, weighing up to 190 tonnes and measuring up to 33.6 metres (110 ft) long. The largest extant terrestrial animal is the African bush elephant (Loxodonta africana), weighing up to 12.25 tonnes and measuring up to 10.67 metres (35.0 ft) long.
Agnatha ( / ˈæɡnəθə, æɡˈneɪθə /; [3] from Ancient Greek ἀ- (a-) 'without', and γνάθος (gnáthos) 'jaws') is an infraphylum [4] of jawless fish in the phylum Chordata, subphylum Vertebrata, consisting of both living ( cyclostomes) and extinct ( conodonts, anaspids, and ostracoderms) species. Among recent animals, cyclostomes ...
The lancelets ( / ˈlænslɪts, ˈlɑːn -/ LA (H)N-slits ), also known as amphioxi ( sg.: amphioxus / ˌæmfiˈɒksəs / AM-fee-OK-səs ), consist of some 30 to 35 species of "fish-like" benthic filter feeding chordates [9] in the subphylum Cephalochordata, class Leptocardii, and family Branchiostomatidae . Lancelets diverged from other ...
The word "invertebrate" comes from the Latin word vertebra, which means a joint in general, and sometimes specifically a joint from the spinal column of a vertebrate. The jointed aspect of vertebra is derived from the concept of turning, expressed in the root verto or vorto, to turn. [5] The prefix in- means "not" or "without".
