Crayfish have two main body areas: the cephalothorax, which consists of the head and upper body, and then the abdomen, which is clearly segmented. You can find appendages on both areas.
What are the two main regions of the crayfish?
Like all crustaceans, a crayfish has a fairly hard exoskeleton that covers its body. As shown in the diagram on the next page, its body is divided into two main parts, the cephalothorax and the abdomen. The cephalothorax consists of the cephalic (or head) region and the thoracic region.
What is the difference in structure of the antennae and antennules?
Locate the large antennae just behind antennules. The antennules are organs used for balance, touch, and taste. Long antennae are organs used for touch, taste, and smell.
Which appendages in the cephalic region are related to eating?
The head (or cephalic) region has five pairs of appendages. The antennules are organs of balance, touch, and taste. Long antennae are organs for touch, taste, and smell. The mandibles, or jaws, crush food by moving from side to side.
What is the main difference between the cephalothorax and the abdomen of crayfish?
The abdomen is located behind the cephalothorax and consists of six clearly divided segments. The cephalothorax consists of 3 segments. Each segment of both the cephalothorax and the abdomen contains a pair of appendages. The head (or cephalic) region has five pairs of appendages.
What is the abdomen?
The abdomen (commonly called the belly) is the body space between the thorax (chest) and pelvis. The diaphragm forms the upper surface of the abdomen. At the level of the pelvic bones, the abdomen ends and the pelvis begins.
How can you distinguish the cephalothorax of your specimen from its abdomen?
The abdomen is located behind the cephalothorax and consists of six clearly divided segments. The cephalothorax consists of 13 segments. Each segment of both the cephalothorax and the abdomen contains a pair of appendages. The head (or cephalic) region has five pairs of appendages.
What are the 6 main structures observed when the exoskeleton of the abdomen is removed?
Antennules, mandibles, maxillipeds, eye, antennae, maxillae, chilipeds. What are the main structures you could have observed when you removed the exoskeleton of the abdomen and tell the function of each? is the crayfish most vulnerable to its enemies from the dorsal or ventral side? Why?
What are the functions of the appendages that are found on the cephalothorax?
…often referred to as the cephalothorax. A pair of appendages is attached to each somite. The first two pairs, the first and second antennae, consist of a segmented stalk and flagella, and serve such sensory functions as olfaction, touch, and balance. The remaining three head appendages are either the crushing…
What are maxillipeds used for?
Thorax / pereon
Maxillipeds are appendages modified to function as mouthparts. Particularly in the less advanced decapods, these can be very similar to the pereiopods. Pereiopods are primarily walking legs and are also used for gathering food. They are also the ten legs from which decapods take their name.
How are the antennae chelipeds and swimmerets related?
How are the antennae, chelipeds, other walking legs, and swimmerets related? They are all used to help sense the environment and help it move. What are the main structures you could have observed when you removed the exoskeleton of the abdomen?
Which of these appendages are cephalic?
The cephalic region contains six basic paired appendages: (1) compound eyes; (2) first antennae, which are biramous in the malacostracans; (3) second antennae; (4) mandibles; (5) first maxillae; and (6) second maxillae.
What is the name of the shell that covers the cephalothorax?
In horseshoe crabs and many crustaceans, a hard shell called the carapace covers the cephalothorax.
What are the appendages found near the rostrum?
Below the rostrum are two pairs of mandibles (the jaws) and three pairs of maxillipeds, which are small appendages that direct food to the mouth.
What is the function of Chitinous teeth?
Chitinous teeth aid in food digestion by helping to further break down food to smaller particles.
How do you distinguish between a male and a female crayfish?
Determining Crawfish Gender
Crawfish tails host small appendages, including swimmerets. Male crawfish carry an extra set of these swimmerets, which are enlarged and hardened. Females possess a small hole just behind their swimmerets. The female’s broader abdomen provides an ideal place to carry her brood.
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