What is the habitat for crayfish?
Surface-dwelling crayfish live in streams, creeks, rivers and lakes. It only digs shallow holes under rocks or water-filled tunnels along a streambank. Crayfish are a vital link in the food chain of an aquatic ecosystem and serve as a main food item for many fish, birds, mammals, reptiles and amphibians.
Where is the anterior on a crayfish?
Directional term used to indicate “toward the animal’s head”, or anterior. Indicating the portion of the body containing the head and thorax, anterior to the abdomen.
What is the dorsal of a crayfish?
The carapace, a shield of chitin, covers the dorsal surface of the Crayfish Dissection 1 Page 2 cephalothorax. On the carapace, observe an indentation, the cervical groove, that extends across the midregion and separates the head and thoracic regions.
What is the abdomen of a crayfish?
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.
Where do crayfish hide?
Crawfish typically like to hide under rocks and plants in the shallow parts of the water. To catch a crawfish, wade into the water and look for rocks that seem likely to be hiding a crawfish.
What are the body parts of a crayfish?
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.
Do crayfish have tentacles?
Also land snails have tentacles and crayfish have antennae. 1.
Do crayfish have a dorsal heart and ventral nerve cord?
Crayfish have – a dorsal heart and ventral nerve cord, a ventral heart and dorsal nerve cord, an exoskeleton, an endoskeleton.
What does the ventral nerve cord do in a crayfish?
The ventral nerve cord of crayfish contains axons of five pairs of excitatory interneurons, each of which can activate the swimmeret system. Perfusion of the ventral nerve cord with the neuropeptide proctolin also activates the swimmeret system.
Do crayfish have body segments?
What are the internal organs of a crayfish?
Stomach: part of the digestive tract between the esophagus and the intestine. Heart: blood-pumping organ of the crayfish. Gonad: sex gland of a crayfish. Extensor muscles: muscle that extends the tail of the crayfish.
What is the anatomy of a crayfish?
Crayfish have two body segments, the cephalothorax, which is the fused head and thorax, and the abdomen. The cephalothorax is protected by a carapace and is where you’ll find the eyes, antennae, and antennules. You’ll also find the mouth parts: mandibles, two pairs of maxillae, and the maxillipeds.