Knowra Vetulicolia Vetulicolia Vetulicolia is an extinct group of Cambrian marine animals with a carapace-like anterior body and a segmented posterior region. Their evolutionary affinities remain debated.
Cambrian : The first period of the Paleozoic Era, spanning about 539 to 485 million years ago. Vetulicolians are known from Cambrian deposits, especially exceptionally preserved marine fossils.
Filter feeding : Feeding by straining small food particles from water. Gill-like openings in some vetulicolians have been interpreted as part of a suspension-feeding system.
Yunnan : A province in southwestern China with major Cambrian fossil deposits. Several key vetulicolian fossils come from Yunnan's Early Cambrian strata.
Deuterostome : An animal belonging to a major lineage that includes echinoderms and chordates. Some analyses place vetulicolians near or within deuterostomes, while other evidence challenges that placement.
Burgess Shale : A fossil-rich Middle Cambrian deposit in British Columbia, Canada. Its fossils include several important vetulicolian specimens.
Pharyngeal slits : Openings in the pharynx that allow water to pass through the throat region. Their presence in some proposed reconstructions supports comparisons with chordates and filter feeding.
Maotianshan Shales : Early Cambrian fossil-bearing rocks in Yunnan, China, famous for exceptional preservation. They preserve early vetulicolians, including specimens central to taxonomic debate.
Urochordata : A chordate subphylum comprising tunicates, including sea squirts and salps. A proposed tunicate relationship offers one explanation for vetulicolian pharyngeal openings.
Chengjiang biota : An exceptionally preserved Early Cambrian fossil community from Yunnan, China. Chengjiang fossils preserve early vetulicolians and details of their body form.
Swimming : Movement through water by generating thrust with body parts or appendages. The segmented posterior could have provided propulsion, although its precise motion is uncertain.
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