Is there any sign of a structure that you would call a brain? Describe your observation. 4 pts. d. Why is it called a lancelet? e. Does Amphioxus have a distinctive head?
Added by Vanesa E.
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You will see only a simple dorsal nerve cord with an anterior enlargement (a cerebral ganglion) rather than a true, centralized brain. Show more…
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a. First Characteristic: b. Second Characteristic: c. What structures developed from the dorsal hollow nerve cord that led to the formation of the above characteristics? d. First structure: e. Second structure: 2. Corrected_texts: a. Ammocoetes larva (what is it): b. How does it demonstrate a link to ancestral chordates like the lancelet? c. What advances are evident to link it to the vertebrates?
Adi S.
2.1 Discuss the habitat and feeding of Lancelets. (2) 2.2 What is the similarity between the human brain and that of lancelets? (2) 2.3 Describe the nerve cord in lancelets
Chordates Part 1 1) Observe prepared slides of lancelets (Amphioxus). Refer to Chordates I specimens document. Label the following structures: pharyngeal slits, notochord, dorsal hollow nerve cord, post-anal tail a) Classify to subphylum. b) Why is this animal considered a chordate? 2) Lamprey: Observe the preserved Lamprey and refer to the specimens document. a) Who do you think is a more efficient swimmer, the lamprey or a shark, and why? b) Classify to class. 3) Hagfish: Observe the preserved Hagfish and refer to the specimens document. a) Notice the mouths of these vertebrates. Do they have jaws? How do they feed? b) What is the hagfish's ecological role (niche)? c) Classify to class.
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