Deuterostomes (from Greek: lit. 'mouth second') are bilaterian animals of the superphylum Deuterostomia (/ˌdjuːtərəˈstoʊmi.ə/), typically characterized...
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of triploblastic, enterocoelomate, and bilaterally symmetrical marine deuterostome animals, generally considered the sister group of the echinoderms. They...
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lineages, but are not part of the formal definition: All chordates are deuterostomes. This means that, during embryonic development, the anus forms before...
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Animal (section Protostomes and deuterostomes)
the arthropods, molluscs, flatworms, annelids and nematodes; and the deuterostomes, which include the echinoderms, hemichordates and chordates, the latter...
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become its digestive tube (the archenteron). In the sister-clade, the deuterostomes (lit. 'second-mouth'), the original dent becomes the anus while the...
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happened at least twice, following different paths in protostomes and deuterostomes. This accompanied or facilitated other important evolutionary developments:...
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stem- and crown-group arthropods, stem-group vertebrates, and early deuterostomes (a group which as a whole includes the vertebrates, other invertebrate...
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ago in the beginning of the Cambrian period. Initially proposed as a deuterostome, which would make it the oldest known species of this superphylum, it...
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Seta (section Deuterostomes)
shown by the foot pads. In 2017, a description of a new species of basal deuterostome called Saccorhytus was published. This animal appears to have seta in...
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Pharyngeal slits are filter-feeding organs found among deuterostomes. Pharyngeal slits are repeated openings that appear along the pharynx caudal to the...
9 KB (1,096 words) - 09:38, 3 July 2024