from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Plural form of urochordate.


Sorry, no etymologies found.


  • If you'd asked me some years ago, I would have said it's obvious: vertebrates must be more closely related to the cephalochordates—they have such similar post-cranial anatomies—while the urochordates are the weirdos, the most distant cousins of the group.

    Ascidian evo-devo - The Panda's Thumb

  • Did you know the famous paper that originally said that urochordates and vertebrates are sister groups DID NOT INCLUDE THE HEMICHORDATES and further also showed as a result that CEPHALOCHORDATES AND ECHINODERMS are… SISTER GROUPS?

    Ascidian evo-devo - The Panda's Thumb

  • Recent developments in molecular phylogenies, though, strongly suggest that appearances are deceiving and we vertebrates are more closely related to the urochordates than to the cephalochordates, implying that some interesting evolutionary phenomena must have been going on in the urochordates.

    Ascidian evo-devo - The Panda's Thumb

  • That makes the urochordates a particularly interesting group to examine.

    Ascidian evo-devo - The Panda's Thumb

  • For example, whereas in urochordates the ancestral Hox cluster has fragmented, the individual genes show high levels of sequence identity and similar A/P-restricted patterns of expression to their orthologs in other bilaterians.

    Jellyfish lack true Hox genes! - The Panda's Thumb

  • More recently, multiple gene losses have occurred independently in some lineages (nematodes, insects, urochordates), the same groups that have also lost genes of another type of E3s (RBR family).

    BioMed Central - Latest articles

  • From these animals evolved the ancestors of the three modern groups, respectively stem cephalochordates, stem urochordates and stem vertebrates.

    Scientific American

  • Modern chordates are a broad phylum of animals that includes three subphyla: cephalochordates such as the fish-like lancelets, or amphioxus; urochordates such as sea squirts; and vertebrates such as lamprey and humans.

    Scientific American

  • In many animals, too, including annelid worms, mollusks, and urochordates - an underwater filter-feeding sister group to vertebrates - AOX is present and is believed to provide resistance to oxidative stress.

    Health News from Medical News Today

  • Rinkevich B (2005) Natural chimerism in colonial urochordates.

    PLoS ONE Alerts: New Articles


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