Flashcards: zool lab no. 7

forms the mouth after the anus

Phylum Chordata germ layers

With fluid-filled cavity between the gut and the outer body wall

key features of Chordates

a dorsal longitudinal rod, supports the body in Chordates

brain and spinal cord (fish & other vertebrates)

slits - openings in the pharynx that extend to the outside environment in Chordates

appendage that extends posterior to the anus.

tunicates subphylum

Translucent, fish-shaped animals, 5 to 10 cm long and pointed at both ends

form of Urochordata that possess all key feature of Chordates

All 4 chordate features are well represented throughout the adult life, examples of this subphylum is the Lancelet

w/ bony or cartilaginous backbone (vertebrae) w/c surrounds the nerve cord

situated behind the anus of Vertebrata

w/o true jaws or paired appendages

class under the subphylum vertebrata, supercalss agnatha

Mouth w/ 4 pairs of tentacles; 5-15 pairs of gill pouches; slime glands; notochord persist all through out life & not replaced by vertebral column

example of class myxini

Suctorial mouth w/ horny teeth; 7 pairs of gill pouches;

example of Class Cephalaspidomorphi

jawed fishes (w/ jaws) and all tetrapods (4-limbed); paired appendages

▪ Streamlined body w/ heterocercal tail; ▪ Cartilaginous skeleton; ▪ 5-7 gills w/ separate openings, no operculum, no swimbladder

class chondrichthyes tail

▪ Primitively fusiform body; ▪ Ossified/BONY skeleton; ▪ Single gill opening on each side w/ operculum; ▪ Swim bladder (bouyancy) or lung present

• Live on land and water • Webbed feet • Breathe with lungs and gills • Cold-blooded animals • Moist smooth skin (No hair or fur) • 4 legs (sometimes none) • Lay many eggs

• Have scales (not fur) • Dry skin • Usually lay eggs or live young • Ear holes instead of ears • 4 legs or none • Cold-blooded

Have feathers and wings • Lay eggs • Have 2 legs • Ear holes instead of ears • Warm- blooded