TOPIC 28: osteichythyans (bony fish)

Question 1

osteichthyans

Answer 1

bony fish

Question 2

shared derived traits of osteichthyans

Answer 2

• lung/lung derivatives
• operculum (dermal bone plate)
• manueverable fins

Question 3

instead of lungs, extant bony fish have what?

Answer 3

a swim bladder

Question 4

swim bladder of fish is ___ to lungs of tetrapods

Answer 4

homologous

Question 5

function of the opercolumns

Answer 5

protects the gills , help draw in water for breathing, functions as a buccal pump

Question 6

function of bony scales in fish

Answer 6

they act as protecting and provide flexibility

Question 7

common method for reproduction in fihs

Answer 7

external fertilization

Question 8

two groups of extant bony fish

Answer 8

1. ray fish
2. lobe-finned fish

Question 9

difference in fins with ray fish and lobe fins

Answer 9

ray fish have long flexible bones and lobes have fleshy fins

Question 10

what is a shared derived trait of clade lobe fins

Answer 10

lobe fins

Question 11

three lineages of lobe fins

Answer 11

coelacanths, lung fish, and tetrapods

Question 12

what are the two modes of gas echange in a lungfish

Answer 12

gills and lungs

Question 13

the lungs of lungfish are ____ to the lungs of tetrapods

Answer 13

homologous