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Hemichordates, Chordates and Fishes



    Subkingdom
    Phylum
    Subphylum
      Class
      Subclass
        Order
        Suborder
          Infraorder
          Superfamily

From The
Zoological Record

The core information for this page is taken from the website of The Zoological Record. The original text has been abbreviated, some taxonomic groups are added, and links to further information have been expanded. For convenience the taxonomic list is distributed among several separate pages.
 

Hemichordata hemichordates, marine wormlike animals which live in u-shaped burrows in sand or mud, do have some chordate characteristics but not a notochord as once erroneously thought -- [ ucmp | ToL ]

    Enteropneusta acorn worms, tongue worms, solitary (Balanoglossus, Saccoglossus)

    Planctosphaeroidea only known from pelagic larval forms

    Pterobranchia pterobranchs, mostly colonial (Cephalodiscus Rhabdopleura)

    Graptolithina graptolites, a group of marine colonial animals that lived from the Cambrian to the mid-Carboniferous, most of them floated freely about in the ocean, but some lived attached to the bottom, most fossil graptolites look like nothing so much as tiny sawblades and they have a checkered history of classification -- Their affinities being very difficult make out (Mediograptus)

Phoronida phoronids, lophophorate marine worm like animals of uncertain affinities -- [ Emig ]

Chordata chordates, characterized by having a single dorsal nerve chord, a notochord and pharyngeal gill slits at some stage of their life cycle -- [ ToL | ummzADW | links | ucmp ]

Calcichordata calcichordates, fossil group of uncertain lineage

Urochordata (=Tunicata) urochordates, tunicates, mostly sessile marine organisms -- [ ucmp | ummzADW ]

    Ascidiacea sea squirts (Botryllus Ciona)

    Larvacea (=Appendicularia) appendicularians (Oikopleura)

    Thaliacea chain tunicates, salps (Salpa)

Cephalochordata (=Acrania) cephalochordates, acraniates, lancelets, amphioxus, small scaleless fish like animals (Branchiostoma) -- [ ucmp ]

Craniata craniates, have skulls (often subdivided into two groups -- The Agnatha lacking jaws & the Gnathostomata with jaws) -- [ ToL ]

    Myxini hagfishes, jawless eel shaped marine fish
      Myxiniformes

Vertebrata have backbones -- Lampreys and jawed vertebrates: -- [ ToL | ucmp | ummzADW | links ]

'Fish like' groups -- [ FishBase | links | Catalog of Fishes | austmus ]




Protozoa  |  Metazoa  |  Invertebrates  |  Arthropods  |  Hemichordates  |  Chordates  |  Craniates
Vertebrates  |  Unicellular-organisms  |  Sponges  |  Corals  |  Echinoderms  |  Worms  |  Mollusks
Crustaceans  |  Arachnids  |  Insects  |  Fish  |  Amphibians  |  Reptiles  |  Birds  |  Mammals

Back to: Evolution   |   Zoology




Send suggestions, additions, corrections to Richard White at R. White


fishes.htm 3/8/2001   Links verified 3/8/2001