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15 Cards in this Set
- Front
- Back
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Protochordates
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hemichordates
cephalochordates urochordates |
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Pelagic
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living in open water between surface and bottom
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planktonic
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being moved from place to place by currents and tides
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Benthic
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living on or within a bottom marine substrate
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dioecious
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male and female gonads are in separate individuals
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monoecous
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both female and male gonads in one individual
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Chordate characteristics of Hemichordata
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pharyngeal slits
dorsal nerve cord |
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Enteropneusta-3 parts of body
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acorn worm
1. proboscis 2. collar 3. trunk |
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Cephalochordata
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Amphioxus
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Ventral Channel
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endostyle
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dorsal channel
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epibranchial groove
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Parts of the oral hood in the amphioxus
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buccal cirri (prevent entrance of large particles)
wheel organ (ciliated tracts that move the food) Velum (partial diaphragm) Velar tentacles (sensory for sorting food) |
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Parts of the amphioxus pharynx
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Endostyle (ventral channel)
Epibranchial groove (dorsal channel) Hatschek's groove (secretes mucus for collecting food particles) |
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Why is the notochord of the Amphioxus different?
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contraction of the muscles cells of the notochord cause the notochord to stiffen due to the tough notochordal sheath
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Urochordata
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Tunicates
(body walls made of tunicin to form a tunic) |
