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  2. Chordate - Wikipedia

    en.wikipedia.org/wiki/Chordate

    A chordate (/ ˈ k ɔːr d eɪ t / KOR-dayt) is a deuterostomal bilaterian animal belonging to the phylum Chordata (/ k ɔːr ˈ d eɪ t ə / kor-DAY-tə).All chordates possess, at some point during their larval or adult stages, five distinctive physical characteristics (synapomorphies) that distinguish them from other taxa.

  3. List of chordate orders - Wikipedia

    en.wikipedia.org/wiki/List_of_chordate_orders

    This article contains a list of all of the classes and orders that are located in the Phylum Chordata. The subphyla Tunicata and Vertebrata are in the unranked Olfactores clade, while the subphylum Cephalochordata is not. Animals in Olfactores are characterized as having a more advanced olfactory system than animals not in it.

  4. Mammal classification - Wikipedia

    en.wikipedia.org/wiki/Mammal_classification

    Mammalia is a class of animal within the phylum Chordata. Mammal classification has been through several iterations since Carl Linnaeus initially defined the class. No classification system is universally accepted; McKenna & Bell (1997) and Wilson & Reader (2005) provide useful recent compendiums. [1]

  5. Bilateria - Wikipedia

    en.wikipedia.org/wiki/Bilateria

    Xenambulacraria may be sister to Chordata or to Centroneuralia (corresponding to Nephrozoa without Ambulacraria, or, as shown here, to Chordata + Protostomia). [36] The cladogram indicates approximately when some clades radiated into newer clades, in millions of years ago (Mya). [37]

  6. Deuterostome - Wikipedia

    en.wikipedia.org/wiki/Deuterostome

    Another feature present in both the Hemichordata and Chordata is pharyngotremy — the presence of spiracles or gill slits into the pharynx, which is also found in some primitive fossil echinoderms . [17] [18] A hollow nerve cord is found in all chordates, including tunicates (in the larval stage). Some hemichordates also have a tubular nerve cord.

  7. Cladogram - Wikipedia

    en.wikipedia.org/wiki/Cladogram

    A cladogram is the diagrammatic result of an analysis, which groups taxa on the basis of synapomorphies alone. There are many other phylogenetic algorithms that treat data somewhat differently, and result in phylogenetic trees that look like cladograms but are not cladograms.

  8. Clade - Wikipedia

    en.wikipedia.org/wiki/Clade

    The results of phylogenetic/cladistic analyses are tree-shaped diagrams called cladograms; they, and all their branches, are phylogenetic hypotheses. [ 12 ] Three methods of defining clades are featured in phylogenetic nomenclature : node-, stem-, and apomorphy-based (see Phylogenetic nomenclature§Phylogenetic definitions of clade names for ...

  9. Evolution of fish - Wikipedia

    en.wikipedia.org/wiki/Evolution_of_fish

    Earlier chordates used their gills for both respiration and feeding, ... The cladogram for jawed vertebrates is a continuation of the cladogram in the section above.