Osteichthyes Flashcards
what does Osteichthyes mean?
bony fish
what are the 2 types of osteichthyes
- sarcoterigii
- actinoperygii
what are the general features of actinopertygii
THERES LOTS OF EXPECTIONS
- gas bladder
- terminal mouth
- ossified skeleton
- more advanced lateral line
- scale covered skin
- poikilothermic
- fins have spiny and soft part
explain the ossified skeleton
the meckels cartilage is now the pre maxilla, maxilla and mandible
they now have vertebrae and support ribs
what kind of lungs do actinopertygii have?
primitive lung that is out of the pharyngeal region
what are the 2 types of gas bladders
physotymus
- connected to gut
- can gulp air
phyoclistous
- transport gas in bladder through circulation
why do some fish have lungs and others don’t
buoyancy is more important than oxygen
what does poikilothermic mean?
they don’t regulate their own body temp
what type of fertilization do most fish use?
ovoparitous with external fertilization
types of gender growth fish can have
- gonochorism
- protandrous hermaphrothrodism
- hermaphroditism
- protogynous hermaphroditism
explain gonochorism
being either male or female
explain protandrous hermaphrothrodism
male turns into female when needed
explain protogynous hermaphroditism
female turning into male
explain hermaphroditism
being both male and female at the same time
what is a sense that sharks have that fish lack
electroreception
how do fish fins differ from sharks
fish can move their tails due to heterocercal tail that regulate their buoyancy
what are some examples of actinopertygii
- polypteriformes: ganoid scales
- acipenseriformes
-amiiforms: cycloid scales - teleost :spiny finned
what are the general features of sacrcoterygii general features
- two dorsal fins
- dual lobed tail
- fleshy fin stalks
what’s key differences between sacrcoterygii and actinperygii
- 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
explain the lungfish heart in detail
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
how does fin anatomy differ in sacrcoterygii and actinoperygii
sacrcotergyii have more bones then fin rays
what the differences between bony fish and sharks
bony fish have
- gas bladder
- terminal mouth
- ossified skeleton
- more advanced lateral line
- scale covered skin
