Osteichthyes

Question 1

what does Osteichthyes mean?

Answer 1

bony fish

Question 2

what are the 2 types of osteichthyes

Answer 2

• sarcoterigii
• actinoperygii

Question 3

what are the general features of actinopertygii

Answer 3

THERES LOTS OF EXPECTIONS
- gas bladder
- terminal mouth
- ossified skeleton
- more advanced lateral line
- scale covered skin
- poikilothermic
- fins have spiny and soft part

Question 4

explain the ossified skeleton

Answer 4

the meckels cartilage is now the pre maxilla, maxilla and mandible
they now have vertebrae and support ribs

Question 5

what kind of lungs do actinopertygii have?

Answer 5

primitive lung that is out of the pharyngeal region

Question 6

what are the 2 types of gas bladders

Answer 6

physotymus
- connected to gut
- can gulp air
phyoclistous
- transport gas in bladder through circulation

Question 7

why do some fish have lungs and others don’t

Answer 7

buoyancy is more important than oxygen

Question 8

what does poikilothermic mean?

Answer 8

they don’t regulate their own body temp

Question 9

what type of fertilization do most fish use?

Answer 9

ovoparitous with external fertilization

Question 10

types of gender growth fish can have

Answer 10

• gonochorism
• protandrous hermaphrothrodism
• hermaphroditism
• protogynous hermaphroditism

Question 11

explain gonochorism

Answer 11

being either male or female

Question 12

explain protandrous hermaphrothrodism

Answer 12

male turns into female when needed

Question 13

explain protogynous hermaphroditism

Answer 13

female turning into male

Question 14

explain hermaphroditism

Answer 14

being both male and female at the same time

Question 15

what is a sense that sharks have that fish lack

Answer 15

electroreception

Question 16

how do fish fins differ from sharks

Answer 16

fish can move their tails due to heterocercal tail that regulate their buoyancy

Question 17

what are some examples of actinopertygii

Answer 17

• polypteriformes: ganoid scales
• acipenseriformes
  -amiiforms: cycloid scales
• teleost :spiny finned

Question 18

what are the general features of sacrcoterygii general features

Answer 18

• two dorsal fins
• dual lobed tail
• fleshy fin stalks

Question 19

what’s key differences between sacrcoterygii and actinperygii

Answer 19

• the lung was retained in sacrcotergii so they more active and the helped them get onto land
• fins in sacrcotergyii have more bones and less fin rays

Question 20

explain the lungfish heart in detail

Answer 20

the heart has 2 atriums
- blood comes from lungs to gills then to body
- blood can go to lungs bypass the gills if in hypoxic environment then go to body so oxygen isn’t taken from dexygenated water in gills

Question 21

how does fin anatomy differ in sacrcoterygii and actinoperygii

Answer 21

sacrcotergyii have more bones then fin rays

Question 22

what the differences between bony fish and sharks

Answer 22

bony fish have
- gas bladder
- terminal mouth
- ossified skeleton
- more advanced lateral line
- scale covered skin