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 are the two main sections of the body 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 are the white feathery structures when the carapace shell was removed?
Note the exposed gills (feathery structures just under the carapace you removed). 8. Remove the exposed gills and legs attached to the thorax. Carefully separate the dorsal layer of the muscles in the thorax and not the light colored heart just underneath.
How does a crayfish digestive system work?
Digestive System: Crayfish are carnivorous scavengers lending to the fact that their digestive systems are relatively simple. As seen in the external anatomy, crayfish of complex mouthparts to aid in the feeding process. Upon entering the mouth, the food travels down the short esophagus into the stomach.
Is fertilization in crayfish external or internal?
Crayfish have external fertilization (Hamr, 2002). As is well known, there are differences between the crayfish families in their genital morphology (e.g. summarized in Reynolds and Souty-Grosset, 2012).
What structures on a crayfish are used for capturing prey?
The chelipeds are the large claws that the crayfish uses for defense and to capture prey.
What is the crayfish circulatory system?
The circulatory system of the crayfish is an open system where the blood is contained in vessels for only part of the system. The heart is located in a pericardial sinus located in the upper part of the thorax (a sinus is a sac or cavity). The heart pumps the blood into the arteries.
What does the cephalothorax do in a crayfish?
Learning > Species > Crustaceans > Crayfish Glossary
| Term | Definition |
|---|---|
| cephalic | Directional term used to indicate “toward the animal’s head”, or anterior. |
| cephalothorax | Indicating the portion of the body containing the head and thorax, anterior to the abdomen. |
What is the function of the testes in a crayfish?
The elongated H-shaped testis is responsible for spermatogenesis and is composed of follicles, a common collecting duct with interlaced scattered striated muscles, and a serosa as an external wall.
What are the structures of a crayfish?
The body of the crayfish consists of a fused head and thorax: the cephalothorax. The cephalothorax is covered by a thick armor called a carapace. Extending from the carapace is a pointy structure called the rostrum. Locate the cephalothorax and rostrum.
What is the function of the stomach in a crayfish?
Crayfish have a two-part stomach, with each stomach breaking apart food in a different manner. They also possess a digestive gland, sometimes called a liver, and an intestine that finishes the digestive process and excretes waste as the organ travels from the second stomach to the anus.
What is the cephalothorax 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.
What is the anatomy of a crayfish?
Internal anatomy of a crayfish: edible freshwater crustacean, with pincers on the two forelegs. Encephalon: site of the mental functions of a crayfish. Stomach: part of the digestive tract between the esophagus and the intestine.