Pisces Flashcards
Lobe finned fishes are called
Sacopterigii
Ray finned fish are termed
Actinopterigii
Sharks, rays and skates are termed
Chondchthyes
Lampreys are termed
Cephalospidomorphi
Hag fishes are called
Myxini
List the external features of fishes
Bone
Cartilage
Scale or bony scale plates
Fin rays
Connective tissue
List the internal skeleton of fishes
Skull bones ( except the roofing bones of the head).
Fin support (fin rays).
Vertebral column
What are the major kind muscles in fishes
Smooth, cardiac and skeletal muscle
The circulation of fishes differs from the reptiles, birds, and mammals in that;?
The oxygenated blood does not return to the heart prior to distribution to the other parts of the body
List the extinct classes of pisces
Ans: Placodermi
Acanthoidii
Ostracoderms
Hag fishes ( mixini) are sometimes known
Slime eels
One distinctive feature btw hag fishes and lampreys is____??
The hag fishes have vestigial eyes and the eyes are covered by a thin opaque membrane. Meaning they’re mostly blind
While the lampreys have well developed eyes
The larvae form of lampreys are called ___?
Ammocoetes
Another name for chondrichthyes is ______?
Selachi
The opening behind each eye in most sharks is called—-?
Spiracles
The chondrichthyes have 2 extant subclasses which are ________?
Holocephali and elasmobranchii
What are claspers
They’re male copulatory organ ( intromittent organ)
What are holocephalians?
They’re the chimaeras ( ratfish)
What is the difference between holocephali and elasmobranchii.
In holocephali an operculum covers the Gill slits and the teeth is replaced by bony plates.
List the subclasses of actinopterygii
Teleostei
Chondrostei
Neopterigii
List one distinctive feature of the subclass teleostei…
The subclass teleostei have a homoceral tail.
Meaning the upper and lower tips of its tail are equal
Representatives of the subclass chondrostei are___?
Sturgeons and paddlefish
A distinctive feature of the subclass neopterigii is_____?
Is that their scales are ganoid scales
Sacopterigii have internal nares that open internally into the _____?
Oropharyngeal cavity
The 2 order of sacopterigii are______?
Actinistia or crossopterygii and
Rhipidistia( lung fishes)
Air breathing fishes are called____???
Rhipidistia
