Vertebrates Flashcards
blocks of mesoderm that become muscles
somites
a hole in the lancelet where water exits
artiopore
organ rotation in a metamorphosing tunicate
90 degrees
chamber in tunicate
atrium
number of hox genes in tunicates and lancelets
1
a collection of cells that appears along the edges of the closing neural tube of an embryo
neural crest cells
superclass that includes hagfish and lancelets
cyclostomes
clade that includes jawed animals
gnathostomes
class that includes hagfish
myxini
class that includes lampreys
Petromyzontida
composition of tooth-like formations in hagfish
Keratin
number of hox gene sets in gnathostomes
4
organs that form a row along each side of the body and are sensitive to vibrations in the surrounding water
lateral line system
corkscrew-shaped ridge that increases surface area and prolongs the passage of food through the relatively short digestive tract in sharks
spiral valve
mother lays eggs that hatch outside the mother’s body
Oviparous
mother retain the fertilized eggs in the oviduct
Ovoviviparous
young develop within the uterus
Viviparous
skeleton composition of fish
calcium phosphate
number of pairs of fish gills
four or five
class of ray finned fish
actinopterygii
clade of lobe finned fish
sarcopterygii
origin of sarcopterygii
silurian
origin of actinopterygii
silurian
order of coelocanths
actinistia
