What 4 tools are necessary for a crayfish dissection?
Materials needed for the lab activity: Preserved Crayfish; Dissection Pan; Dissection kit; Scalpel; Forceps; Scissors; Dissecting Pins; Probes.
What structures are used for capturing prey and securing and eating food crayfish?
The chelipeds are the large claws that the crayfish uses for defense and to capture prey.
How many segments are on your crayfish?
The part of the exoskeleton that covers the cephalothorax is called the carapace. The abdomen is located behind the cephalothorax and consists of six clearly divided segments.
What is the phylum of a crayfish?
crayfish, also called crawfish or crawdad, any of numerous crustaceans (order Decapoda, phylum Arthropoda) constituting the families Astacidae (Northern Hemisphere), Parastacidae, and Austroastracidae (Southern Hemisphere).
How do you dissect a frog?
Frog Internal Anatomy – Dissection Guide Lay the frog on its back, spread out its limbs, and pin them to the tray. Use forceps to lift the skin between the hind legs and make a small incision with a scalpel. Continue the cut up the center of the frog’s body with scissors, being careful to cut through the skin only.
What structures and behaviors allow crayfish to defend and protect themselves in their environment?
The large pincers grab and hold prey, and they help ward off predators. When threatened, crayfish often raise their pincers high and wave them around. Some also use their front pincers to help dig burrows.
How many mandibles do crayfish have?
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.
How many mandibles does a crayfish have?
What are the appendages of a crayfish?
The appendages of the crayfish attach to both the cephalothorax and the abdomen. The appendages that attach to the thorax are called WALKING LEGS and you can see how they are jointed in the figure below. The smaller appendages attached to the segments of the abdomen are called SWIMMERETS.
What are three structures of a crayfish?
Nearly all live in fresh water, although a few species occur in brackish water or salt water. Crayfish are characterized by a joined head and thorax, or midsection, and a segmented body, which is sandy yellow, green, red, or dark brown in colour. The head has a sharp snout, and the compound eyes are on movable stalks.