Phylum Chordata

Question 1

Defining characteristics

Answer 1

Dorsal hollow nerve cord, notochord, pharyngeal gill slits, post-anal tail, endostyle

Question 2

What animal is in class myxin

Answer 2

Hagfish

Question 3

What class are lampreys a part of

Answer 3

Petromyzontida

Question 4

What animals are part of class chondrichthyes

Answer 4

Sharks, skates, rays

Question 5

Characteristics of class myxin

Answer 5

Naked skin with slime glands, two rows of teeth on tongue, osmoconformers, 5-16 pairs of gills, degenerated eyes, primary heart with three accessory hearts

Question 6

Characteristics of class petromyzontida

Answer 6

Naked skin, sucker-luke oral disk, tongue with teeth, seven pairs of gills, stomach and spiral folds in intestine, well developed eyes, ammocoete larvae, anadromous or freshwater

Question 7

Characteristics of class chondrichthyes

Answer 7

Heterocercal tail-lobes on tail are different sizes, claspers, placoid scales, cartilaginous endoskeleton, intestine with spiral valve, exposed gill slits

Question 8

Which two subclasses are under class chondrichthyes

Answer 8

Elasmobranchii-sharks, skates, rays
Holocephal-chimeras

Question 9

Heterocercal tail

Answer 9

Lobes are different sizes, primarily on sharks

Question 10

Diphyceral tail

Answer 10

Single fin, primarily on lungfish

Question 11

Homocercal tail

Answer 11

Lobes are same size, primarily on perch

Question 12

Placoid scales

Answer 12

Looks like a bird

Question 13

Ganoid scales

Answer 13

Diamond shaped

Question 14

Cycloid scales

Answer 14

Looks like a dinosaur foot

Question 15

Ctenoid scales

Answer 15

Has pointy edges

Question 16

How do sharked maintain buoyancy

Answer 16

They keep moving forward

Question 17

What are weberian ossicles

Answer 17

Small bones that allows them to hear further