Section 20.4- Crustaceans: Aquatic Arthropods Flashcards
aquatic arthropods that range in size from woodlice to giant crabs
crustaceans
strengthens the crustaceans crusty exoskeleton
calcium carbonate
crustaceans that people often call crawfish or crawdads
crayfish
two major regions of the crayfish
cephalothorax
abdomen
an especially hard outer shell that provides the vital organs with added protection from predators
carapace
a forward extension of the carapace the protects the well-defined head
rostrum
two _____________eyes are attached to the head by flexible stalks
compound
the shorter feelers attached to a crayfish’s head
antennules
the sense of touch, taste, and smell come from the large
antennae
the chewing appendages located near the opening of the mouth
mandibles and maxillae
set of appendages designed to help crayfish keep a firm grip on its food
jaw feet
maxillipeds
a large pair of appendages with pincers which the crayfish uses to seize its prey and for self-defense
chelipeds
the crayfish’s abdominal appendages are known as
swimmerets
formed by the swimmerets on the sixth segment
used for swimming
uropod
flat triangular projection terminating the sixth segment
telson
serves as a gizzard, grinding food into small particles for digestion
gastric mill
crayfish breathe through
gills
crayfish have an ____________ circulatory system
open
an open area surrounding the heart in which collects before it reenters the heart through the ostia
pericardial sinus
special excretory glands which lie in front of the stomach and open to the outside near the base of the antennae
functions like a kidney to remove wastes from the blood
green glands
located at the base of the antennules and contain sensory hairs and grains of sand
enables crayfish to adjust position and maintain equilibrium
statocysts
most crustaceans are
small or microscopic
crustacean that rolls into a ball whenever it is disturbed
often called sowbug, pillbug, or roly-polys
woodlouse
found in salt lakes and marshes and are commonly used as living food in aquariums
brine shrimps
marine crustaceans that attach themselves to rocks etc
barnacles
some of the most familiar of the extinct arthropods
small aquatic arthropods similar in some ways to horseshoe crabs
trilobites
one of the most bizarre arthropods that has become extinct was
Anomalocaris
