Identify structure #3

The first pair of walking legs, bearing large

claws used in defense, offense, and predatory

feeding.

Identify structure #7

Fused head and thorax, covered by the

carapace.

Crayfish use ____ to grab food and protect themselves

What is the structure labeled 2

Pair of biramous (two-branched) sensory

appendages on the head that function in taste,

touch, balance, and equilibrium.

What is the structure labeled 6

The clearly segmented body region of a

crayfish, located posterior to the cephalothorax.

What is the structure labeled 4

Stalked, compound organ of

vision, on each side of the head.

What is the structure labeled 10

One of the paired lateral appendages that,

together with the telson, form the tail. Along

with the telson, they allow rapid and directed

movement.

How many Chilapeds do Crayfish have?

How many pair of swimmerets do crayfish have?

Muscles that extend longitudinally down the abdomen.

External covering that functions in protection, support, and muscle attachment. Chitin and calcium carbonate are two major components

of the crayfish exoskeleton.

Thickened portion of exoskeleton that

covers the cephalothorax.

Five pairs of abdominal appendages. In females, they hold and protect eggs before hatching. In males, the two anterior pairs are specialized for the transfer of sperm.

Five pairs of locomotory appendages that include the large chelipeds; the second and third pairs are tipped with small pincers.

Hard, jawlike pair of mouthparts that bite food into smaller pieces.

Posterior projection forming the central part of

the tail fin; contains the anus.

Exit opening for digestive waste.

Anterior projection of the carapace over the eyes.

Paired excretory organs found near the head that release waste out of the crawfish along the ventral body wall.

Respiratory organs of gas exchange.

Opening between a pouch of the carapace and an inner body wall; water passes through for oxygen exchange.

Sac that surrounds the heart.

circulatory pump in pericardial sinus; pumps blood into arteries, and blood returns through sinuses.

digestive tube that carries waste to anus

Digestive organ consisting of an anterior cardiac chamber, a grinding, gastric mill, and a pyloric chamber.

Three of the six pairs of mouthparts, including the longest.

two pairs of mouthparts; one pair pulls water through the gill chambers

two large muscles that operate the mandibles.

Muscles that flex the abdomen of the

crayfish, rapidly propelling the crayfish backward to escape predators.

produces digestive enzymes and functions in food

nutrient absorption. It is sometimes called the

hepatopancreas.

female structure on which male deposits sperm.

testis in males, and ovary in females.

where eggs or sperm exit the body; in females, found at the base of the third walking leg.