Chordates are animals which are either vertebrates or one of several closely related invertebrates. They are united by having,
for at least some period of their life cycle, a notochord, a hollow dorsal nerve cord, pharyngeal slits, an endostyle, and
a post-anal tail. The phylum Chordata consists of three subphyla: Urochordata, represented by tunicates; Cephalochordata,
represented by lancelets; and Craniata, which includes Vertebrata.
Echinoderm" there are seven main classes of Echinoderms which are brittle stars, basket stars, sea urchins, sand dollars,
sea lilies, feather stars, and sea cucumbers. They can be found at every ocean depth, from the intertidal zone to the abyssal
zone.
Hemichordata is a phylum of worm-shaped marine deuterostome animals, generally considered the sister group of the echinoderms.
They date back to the Lower or Middle Cambrian and include an important class of fossils called graptolites, most of which
became extinct in the Carboniferous.
Protacanthopterygii is a taxon superorder of bony ray-finned fish. Protacanthopterygii is composed of primitive teleosts.
Their common fish anatomy usually include: lack of specialization; greater than 24 vertebrae; adipose fin; mesocoracoid bone;
glossohyal teeth; non-protrusible upper jaw; proethmoid and several perichondral ethmoid bones commissural fibers; one supraorbital
foramen and no gular plate.
Clavelina ("little bottle") is genus of tunicates. List of Species: Clavelina dellavallei Clavelina flava Clavelina lepadiformis
Clavelina oblonga Clavelina huntsmani
