An amphioxus is a lancelet, particularly of the genus Branchiostoma.
Cephalochordata
An amphioxus is a lancelet, particularly of the genus Branchiostoma.
Amphioxus has a wheel organ which creates a current. This current carries water into the mouth, where food is trapped in the pharynx by cilia and mucus. Excess water is filtered through the pharyngeal slits to the atrium and out the atriopore.
The whole body of Pandocia corresponds to the trunk region of the amphioxus. This region encompasses the main body segment, which is responsible for locomotion and contains the essential organs. Pandocia, being a genus of extinct jawless fish, shares this anatomical organization, reflecting the evolutionary relationships between these organisms.
Cephalochordates e.g. Amphioxus ,; tunicates , acorn worms etc. are nonvertebrate chordates , they are collctively called protochordates .
There are three surviving subphylums of Chordata. The first, which branches off earliest, is called Urochordata and contains tunicates. The other two branches fork later, and are the Cephalochordata (amphioxus/lancelets) and Craniata (all vertebrates).
Examples of protochordata are Balanoglossus,Herdmania and Amphioxus.
The lancelets, also known as amphioxus, are a group of 32 species of marine creatures in shallow waters. Despite giving good insight into the origination of vertebrate life, they are not themselves vertebrates, because their 'spine' is not a true spine.
Lancelets, also known as amphioxus, are chordates that exhibit characteristics such as a notochord, dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail. These features are present at some stage in their life cycle, distinguishing them as chordates.
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J. E. Webb has written: 'The erosion of Victoria Beach' -- subject(s): Beach erosion, Shore protection 'Cephalochordata' -- subject(s): Amphioxus, Marine animals 'Guide to invertebrate animals' -- subject(s): Animals, Classification, Invertebrates
1 . The animals are bilaterallysymmetrical , triploblastic and have coelem .2 . They have a notochord , at least some stages during their lives . The notochord run along the back of the animal separating the nervous tissue from the gut . It provides support and a place for muscles to attach .3 . Protochordates are marine animals . Examples are Balanglossus , Herdemania , Amphioxus , etc