Download Crayfish flash cards

Sperm
The male sex cell
Statocycts
Small pouch which contains grains of sand and
used for balance
Mandible
True jaws; move sideways
Maxillae
Little legs that act like jaws
Maxillipeds
First of three pair of legs on the thorax, used to
hold food
Cephalothorax
The head + chest region on a crayfish
Green glands
Organs that filter& excrete waste from blood;
located at base of antennae
Chelipeds
Scientific name for claws, largest appendage, 1
pair, used to capture food & for protection
Swimmerets
Small legs found on the abdomen; used for
swimming & moving water towards gills
Telson
The last segment of the abdomen
Sensory bristles
Small, hair-like structures used for touch
Antennae
Long organs used for touch and smell
Esophagus
The tube that connects the mouth to the stomach
Egg
Female sex cell
Chitin
Material that makes up the exoskeleton
Arthropoda
Phylum of the crayfish
Walking legs
4 pair; used to move; gills are attached to each
pair of walking legs
Gills
Organ used for breathing; exchange of oxygen
& cargon dioxide
Analogous organs
Organs in different animals that are similar in
structure and function (lungs & gills)
Homologous organs
Organs in different animals that are the same in
stucture & function (liver in frogs & humans)
Cardiac stomach
Stomach that has three chitinous teeth that grind
the food
Pyloric stomach
Stomach where enzymes are added to the food to
complete digestion
Digestive Gland
Make digestive enzymes & place where
nutrients are absorbed from food
Open circulatory system
Blood is not contained entirely within vessels
(arteries and veins)
Ventral nerve cord
Main nerve cord; runs along the ventral side of
animal
Molt
To shed the exoskeleton
Exoskeleton
Hard, external support structure, made of chitin
Compound eye
Eye made of many light detectors; located on the
end of eyestalks
Carapace
The part of the exoskeleton that protects the
cephalothorax
Antennules
Smaller than antennae, used for sense of touch
& smell; may be sensitive to sound; balance
Flippers or Uropods
Found at the very end of the abdomen; used for
swimming
External Fertilization
Eggs are fertilized outside of female's body &
stored on the last three abdominal sections
Regeneration
Animal able to regrow lost appendages
Tail fan
Made up or the telson + uropods (flippers);
crayfish uses it to swim backwards