The planktonic organism <em>Oikopleura dioica</em>, an animal model in the study of evolution and embryonic development in our phylum (chordates), has lost most of ...

The Middle Cambrian chordate known as Pikaia gracilens was once thought to be humanity’s earliest known ancestor, and the earliest known member of the phylum Chordata. Now, a new study flips this ...

Researchers at Osaka University find that a tadpole-like tunicate with nonconventional left-right patterning lacks the Nodal gene found in other chordates and uses Ca 2+ oscillation and right-sided ...

What can the genome of a jawless worm-like marine animal tell us about vertebrate evolution? The publication in Nature of the amphioxus genome provides information on the genome duplications that have ...

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General animal biology: Frog as a representative animal -- Materials of the animal body -- Body covering, skeleton, and body muscles -- Digestive systems and metabolism -- Circulatory systems -- ...