Biodiversity 7 Flashcards
Chordates
notochord that runs the length of the body below the nerve cord
post anal tail, extension of the body that propels the animal forward
A dorsal hollow nerve cord
Helps resist compression and aids in propulsion
Cephalochordates
including a notochord that extends to the end of the post anal tail. We can infer that it did because of the prescence of the notochord
Cephalochordates
they have dorsal hollow nerve cord. They have a notochord and post anal tail that they ise in concert to propel them through the water
Urochordates
have hollow nerve cord, notochord, post anal tail
Vertebrates
synapormorhies for vertebrates are having a skull and vertebraw even if these are cartilgenous
Lampreys
jawless cyclostomes circular. toothy mouth for attaching to live fish as parasites to suck their blood. No paired lateral fins
Hagfish
jawless cyclostomes, eat mostly dead fish, no paired lateral fins
Gnathostomes
jaws evolve from the pharyngeal gill arches that we saw in the basal chordates. They also evolve paired lateral fins
Chondrichthyans
meaning cartilage which defines this group of sharks.
Osteichthyes
group of sbony fish that include the ray finnned fish and the lobe finned vertebrates
Mandibular cartilage
froms the lower jaw, connects with the palatoquadrate
palatoquadrate
bone forms the upper jaw, is mobile, nit fused to the braincase
hyomanidbula
is a large strut like cartilage that articulates with otic (ear) region and supports the jaw joint
Articular
articular becomes the malleus or hammer, bone in the middle ear
quadrate
becomes the incus, or anvil, bone in the middle ear
