Questions and Answers
What is the part of the crayfish that consists of the cephalic region and the thorax?
What is the location of the abdomen in a crayfish?
Located behind the cephalothorax
What covers the cephalothorax of a crayfish?
Carapace
What is the purpose of the cervical groove?
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What is the pointed extension at the head of the crayfish called?
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Where are the compound eyes located in a crayfish?
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What are mandibles in crayfish?
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What are the long extensions off the head used for touch, taste, and smell called?
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What is the function of the maxillae?
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What are antennules used for?
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What is the function of maxillipeds?
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What are chelipeds?
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How many pairs of walking legs do crayfish have?
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Where is the genital pore located in female crayfish?
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Where can the sperm duct opening be found in male crayfish?
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What are swimmerets used for?
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What are uropods?
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What is the telson's function?
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Where is the ovary located in female crayfish?
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What is the location and purpose of the testis in male crayfish?
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What is the function of the esophagus in crayfish?
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What happens to food in the stomach of a crayfish?
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What is the gastric mill?
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What is the digestive gland's role?
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What occurs in the intestine of a crayfish?
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What is the function of the anus in crayfish?
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Where is the dorsal tubular heart located?
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What are sinuses in a crayfish?
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What is the function of arteries in crayfish?
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Where are gills located in a crayfish?
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What do green glands do?
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What is the structure of the dorsal brain in crayfish?
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What does the ventral nerve cord do?
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What are ganglia?
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Study Notes
Crayfish Anatomy Overview
- Crayfish body consists of two main parts: the cephalothorax (head and thorax, 13 segments) and the abdomen (tail, 6 segments).
- Carapace is the protective exoskeleton covering the cephalothorax.
- Cervical groove is an indentation on the carapace, separating the head from the thorax.
Head Structure
- Rostrum is the pointed extension at the front of the head.
- Compound eyes are positioned beneath the rostrum, located at the ends of stalks.
- Mandibles function as "true jaws" for biting and crushing food.
- Antennae serve as sensory organs for touch, taste, and smell.
- Maxillae assist in handling food, tearing it, and directing it to the mouth.
- Antennules are for balance, touch, and taste, located at the foremost segment.
Appendages and Locomotion
- Maxillipeds are three pairs that hold food during consumption.
- Chelipeds are the largest appendages (claws) used for defense and food manipulation.
- Walking legs are four pairs aiding in movement, one on each thoracic segment.
- Swimmerets (first five abdominal segments) are used for slow movement and reproduction.
Reproductive Structures
- Genital pore (female) is located on the base of the second pair of walking legs as a crescent-shaped slit.
- Sperm duct opening (male) is found at the base segment of the fourth walking legs.
Body Parts in the Abdomen
- Uropods are pointed appendages on the last abdominal segment, contributing to movement.
- Telson is triangular, central to the uropods, bears the anus, and forms the tail fan.
Internal Organs and Digestive System
- Ovary appears as a large, pinkish mass under the heart for reproduction.
- Testis is a long, whitish organ located under the heart.
- Esophagus transports food from the mouth to the stomach.
- Stomach processes food using gastric mill (chitinous teeth) for grinding.
- Digestive gland produces digestive substances and absorbs nutrients.
- Intestine conducts undigested material away from the stomach to the anus, where waste is expelled.
Circulatory and Excretory Systems
- Dorsal tubular heart lies beneath the dorsal carapace, anterior to the abdomen, part of the open circulatory system.
- Sinuses allow blood to flow into tissues, creating spaces for nutrient and waste exchange.
- Arteries transport blood throughout the body.
- Gills, feather-like structures, facilitate oxygen absorption and carbon dioxide removal.
Nervous System
- Dorsal brain consists of two lobes located behind the compound eyes.
- Ventral nerve cord runs from the brain, encircling the esophagus, branching out to ganglia.
- Ganglia are segmental enlargements of the ventral nerve cord, responsible for processing sensory and motor information.
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Description
Explore the fascinating anatomy of crayfish in this quiz. Learn about their body structure, specialized appendages, and key features such as the cephalothorax and abdomen. Test your knowledge on how these adaptations help crayfish thrive in their aquatic environments.
