Fish

Front 1

What does super gnathostomata refer too?

Back 1

Jaw mouthed fishes

Front 2

List 5 Major characteristics of sharks and rays

Back 2

Bone tissue totally absent. Skeleton is all cartilage. Gills are exposed as they have no operculum. Paired fins are broad based meaning they cant hover or back up. They have placoid scales. Mouth and nasal sacks are below head.

Front 3

List 3 more characteristics of sharks and rays

Back 3

No lung or swim bladder so they sink. Either oviparpus or viviparous. They have electronic receptors that are located in the pits in their snouts to locate prey.

Front 4

What does class achinopterygii refer to?

Back 4

Bony fishes

Front 5

List 5 major characteristics of bony fish

Back 5

At least some bone present in dermis or endoskeleton. Gills are covered by an operculum if bony plates. Paired fins (pectoral, pelvic) make them highly manouverable. They are usually laterally compressed. Teeth are fused to dermal bones around rim.of mouth rather than borne on primary jaws.

Front 6

List 2 reasons why fish have been so sucessful

Back 6

The evolution of an operculum greatly increases respiratory efficieny duebti ability to create negative pressure. Paired ventral fins allown them to be more manouverable.

Front 7

How do sharks stay afloat?

Back 7

To keep afloat sharks have to keep swimming because they dont have a swim bladder. To deal with this they have an assymetrical tail that provides natural upwars lift and also a very large fatty liver has a density lighter than water.

Front 8

How do bony fish stay afloat?

Back 8

Bony fish have a gas filled swim bladder. They adjust the gas in swim bladder to maintaim neutral buoyancy. They can do this by coming to the suface (bladder attached to eosophageus by a pneumatic duct) or through a gas gland that pumps gas from blood and is reabsorbed by reabsorbive area.

Front 9

2 Chsracteristics of orde dipnoi

Back 9

These are lung fishes. They have true lungs. Living sister group to tetrapods.