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About: Lancelet     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : umbel-rc:EukaryoticCell, within Data Space : dbpedia.org associated with source document(s)

Type: Thinginsectumbel-rc:Animalumbel-rc:BiologicalLivingObjectumbel-rc:EukaryoticCell New Facet based on Instances of this Class

The lancelets (/ˈlænslɪts/ or /ˈlɑːnslɪts/), also known as amphioxi (singular: amphioxus /æmfiˈɒksəs/), consist of some 30 to 35 species of "fish-like" benthic filter feeding chordates in the order Amphioxiformes. They are the modern representatives of the subphylum Cephalochordata. Lancelets closely resemble 530-million-year-old Pikaia, fossils of which are known from the Burgess Shale. Zoologists are interested in them because they provide evolutionary insight into the origins of vertebrates. Lancelets contain many organs and organ systems that are closely related to those of modern fish, but in more primitive form. Therefore, they provide a number of examples of possible evolutionary exaptation. For example, the gill-slits of lancelets are used for feeding only, and not for respiration.