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Bilateria
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Bilateria is a large clade of animals characterised by bilateral symmetry during embryonic development. This means their body plans are laid around a longitudinal axis with a front and a rear end, as
EB1911 Crustacea Fig. 12.—Nauplius of a Prawn
EB1911 Crustacea Fig. 12.—Nauplius of a Prawn
One view is that the original bilaterian was a marine worm somewhat like Xenoturbella.
One view is that the original bilaterian was a marine worm somewhat like Xenoturbella.
Ikaria wariootia, living 571–539 million years ago, is one of the oldest bilaterians identified.
Ikaria wariootia, living 571–539 million years ago, is one of the oldest bilaterians identified.
Chordate
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A chordate is a bilaterian animal belonging to the phylum Chordata. All chordates possess, at some point during their larval or adult stages, five distinctive physical characteristics that distinguish
Bilateria
…The group has traditionally been divided into two main lineages or superphyla. The deuterostomes traditionally include the echinoderms, hemichordates, chordates, and the extinct Vetulicolia. The protostomes include most of the rest, such as arthropods, annelids, molluscs, and flatworms. There are several…
The glass catfish (Kryptopterus vitreolus) is one of the few chordates with a visible backbone. The spinal cord is housed within its backbone.
The glass catfish (Kryptopterus vitreolus) is one of the few chordates with a visible backbone. The spinal cord is housed within its backbone.
Cephalochordate: lancelet. Pictured species: Branchiostoma lanceolatum
Cephalochordate: lancelet. Pictured species: Branchiostoma lanceolatum
sea squirts
sea squirts
A skeleton of the blue whale, the largest animal, extant or extinct, ever discovered. Mounted outside the Long Marine Laboratory at the University of
A skeleton of the blue whale, the largest animal, extant or extinct, ever discovered. Mounted outside the Long Marine Laboratory at the University of California, Santa Cruz. The largest blue whale ever reliably recorded measured 98ft (30m) long.