What does the oval body do in bony fish?
Releases gases from the bladder into the blood
What is a gas gland? What class uses them?
Osteicthyes use them. They secrete gases N2 and O2 into swim bladder.
What is a swim bladder?
Gas filled sac that regulates
Describe the appendage structure of acanthodians?
Fins with spines
Fins with spines
Anterior gill arches made of cartilage
What did teeth evolve from?
Scales on the skin that lined the mouth
Placoderms are commonly known as?
Describe the hea
Describe the head structure of octracoderms?
Had bony head shields
Describe the skeletal structure of octracoderms?
Acanthodians are commonly known as?
What replaced ostracoderms?
Describe the mouth and hea
What kind of blood enters and leaves the heart in fish?
Deoxygenated blood enters and leaves the heart
What organs do bony fish use in their excretory system?
Paired kidneys, urinary ducts, and urinary bladder.
What do kidneys do?
Regulate water blance,
Describe the relation between fish and amphibians in an evolutionary context?
Fish provided the evolutionary base for amphibians to develop and go on land.
What fish lack vertebral columns?
Jawless hagfishes and lampreys
Class Agnatha lack what general c
Describe the appendage structure of chondrichthyes?
What were the first vertebrate to develop teeth?
What are lateral line systems?
Sensory organ for detecting changes in H2O pressure to alert an animal about a
What does viviparous imply?
Birthing live young
Describe how sharks are birthed?
Some are oviparous but most are viviparous
Describe shark gestation periods and their quantity of offspring?
Long gestation periods with relatively few offspring
Bony fish b
T/F First vertebrates had jaws.
False, first vertebrates in oceans lacked jaws.
What type of fish mouth structure became dominant?
Jawed fish became dominant
What kind of animals invaded land first?
What replaced the first land animals as the
What paired appendages do most fish have?
Pectoral and pelvic fins
What are internal gills and which fish have them?
Most fish have them. They are fine filaments of tissue that are rich in blood
What type of circulatory system do most fish have?
What group of fish are the ancestors to amphibians?
What characteristics define lobe finned fish?
Paired fins that have long fleshy muscular lobe, supported by core of articulated
Coelacanths and lungfish belong to what group?