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Questions and Answers
What is the approximate size of an Amphioxus?
What is the approximate size of an Amphioxus?
- 2 cm
- 5 cm (correct)
- 10 cm
- 15 cm
Where does the Amphioxus burrow in the sand?
Where does the Amphioxus burrow in the sand?
- Middle of the body
- Tail region (correct)
- Ventral side
- Dorsal side
What is the main distinguishing feature of the Amphioxus among fish-like creatures?
What is the main distinguishing feature of the Amphioxus among fish-like creatures?
- Lateral fins
- No lateral fins and no distinct head (correct)
- Distinct head
- Ventral fin
Which fin is strengthened by rods of connective tissue called fin rays?
Which fin is strengthened by rods of connective tissue called fin rays?
What is found on each side of the Amphioxus' body called?
What is found on each side of the Amphioxus' body called?
What covers the epidermis of the Amphioxus?
What covers the epidermis of the Amphioxus?
Where is the mouth located in an amphioxus?
Where is the mouth located in an amphioxus?
What is the role of the gill slits in an amphioxus?
What is the role of the gill slits in an amphioxus?
What is the function of the velar tentacles in an amphioxus?
What is the function of the velar tentacles in an amphioxus?
Which structure separates the vestibule from the Velum in an amphioxus?
Which structure separates the vestibule from the Velum in an amphioxus?
What is the function of the atriopore in an amphioxus?
What is the function of the atriopore in an amphioxus?
What is the purpose of the epibranchial groove in an amphioxus?
What is the purpose of the epibranchial groove in an amphioxus?
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Study Notes
Amphioxus Overview
- Approximate size is about 5-7 cm in length.
- Burrows in sandy substrates along shallow coastal areas.
Distinguishing Features
- Main distinguishing feature is the presence of a notochord, which is a flexible rod-like structure.
Fin Structure
- The dorsal fin is strengthened by rods of connective tissue known as fin rays.
Body Characteristics
- Lateral line system is found on each side of the body, serving as a sensory organ.
Protective Covering
- The epidermis is covered by a mucous layer for protection and reducing friction.
Mouth Location
- The mouth is located at the anterior end, surrounded by the velar tentacles.
Gill Slits Function
- Gill slits serve as a passage for water to exit after passing over the gills, aiding in respiration.
Velar Tentacles Role
- Velar tentacles help in feeding by directing food particles towards the mouth.
Anatomical Structures
- The structures that separate the vestibule from the velum are called velar folds.
Atriopore Function
- The atriopore serves to expel excess water from the body after filtration through the gills.
Epibranchial Groove Purpose
- The epibranchial groove is involved in the transportation of food particles to the digestive tract.
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