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7 Science Chapter 9

fish aquatic vertebrates possessing gills, fins & scales
scale bony overlapping plates that protrude from the fish's skin
myomere W-shaped bands of muscle
gill An organ that removes oxygen from water.
gill filament a double row of thin projections that filters water in each gil
gill slit paired openings in the throat behind the mouth
operculum gill cover
lateral line a system of nerve endings that extend over a fish's head & sides
roe fish eggs
milt fluid a male fish releases over the roe; it contains sperm
fry young fish
livebearer fish that give birth to live young
photophore organs that produce light
reptile cold-blooded animals with lungs, scaly skin, and that are born of amniotic eggs.
aminion membrane that contains a developing embryo and its surrounding fluid
chromatophore Cells containing pigment that, through contraction and expansion, produce temporary color changes.
regenerate grows back
spectacle immovable transparent eye covering
dewlap Ornamental crests, frills, and throat fans of iguanids
molt To shed an old outer covering so that it can be replaced with a new one
Jacobson's organ sensing organ located in the mouth of a snake that is used for smelling
venom poisonous liquid containing enzymes & chemicals that destroy portions of a body
fang long hollow or grooved teeth of a snake
antivenin medicine designed to counteract snake venon
pit organ a depression on the side of a pit viper's head between the eyed and nostrils that can detect temperature changes
plastron The lower shell of a turtle
carapace hard outer covering or case of certain organisms such as turtles
scute plates made of keratin that cover the turtle's shell
tortoise turtles that live only on land & have elephantlike feet
amphibian cold-blooded four-legged vertebrates that are most terrestrial but live near water & spend an important part of their life cycle in it
metamorphosis A process in which an animal's body undergoes dramatic changes in form during its life cycle.
cold-blooded regulating body temperature by external means
ichthyologists scientists who study fish
ray-finned fish fish with fins made of webs of skin supported by rays or spines
lobe-finned fish fish with webbed rays attached to the body by a lobe
pectoral fins fins located on the sides of the fish behind its gills
pelvic fins fins located below the pectoral fins on the fish's underside
dorsal fin prominent fin on the top of a fish; used to stabilize the fish while swimming
anal fin fin behind the pelvic; used to stabilize the fish while swimming
caudal fin fin that sticks out from the fish's tail & is used as a propeller
spawning laying large quantities of eggs in the water
gas glands introduce a heavy gas(carbon dioxide) into the bladder to pressurize it so it does not collapse allows the fish to float at its new depth
electric organs organs that allow the fish to generate electricity
denticles The body covering found on sharks, made up of tiny tooth-like structures that give it a sandpaper-like texture.
spiracles A pair of large openings caudal to the eyes. One entry for water to move to gills
eye shine phenomenon in sharks caused by reflective plates in their eyes that helps them see better
bioluminescent capable of glowing
labyrinth organ treelike cavity in the center of the gill chamber of some air-breathing fish
swim bladder large, gas-filled organ tha allows a fish to stay suspended in any depth of water
electrocyte a current-generating cell from an electric organ
neutrally buoyant neither rising nor sinking but remaining at the current depth
cyclostomata class for cartilaginous fish with jaws
mermaid's purse protective case in which some sharks & skates lay their eggs
torpedo electric ray
whale shark largest known fish
chimaeras group containing ratfish, spookfish & elephant fish
rostrum a sawfish's nose
skates long-nosed oviparous batoids
pups baby shark
batoids cartilaginous fish with flattened bodies
hemotoxic venom that affects the circulatory system by causing the red blood cells to burst
lateral undulation the snake bends into a series of curves as it keeps its body flat on the ground
rectilinear movement the snake alternately stretches and shortens segments of its body in order to creep forward in a straight line
concertina movement the snake moves like an accordion
sidewinding movement The process in which a snake supports its body with its head, tail, and two or three other points of contact, it lifts the remainder of its body off the ground and moves it sideways.
brood to sit upon (eggs) to hatch
Created by: Mrs_CC