The cephalochordates share the following characteristics:Group of answer choicesVertebral column, digestive system, respiratory system, nervous systemProtostome development, dorsal hollow nerve cord, notochord, pharyngeal gill slitsDeuterostome development, Coelomate, post-anal tail, notochordTrochophore larva, notochord, post-anal tail, filter-feeders
Question
The cephalochordates share the following characteristics:Group of answer choicesVertebral column, digestive system, respiratory system, nervous systemProtostome development, dorsal hollow nerve cord, notochord, pharyngeal gill slitsDeuterostome development, Coelomate, post-anal tail, notochordTrochophore larva, notochord, post-anal tail, filter-feeders
Solution
The correct answer is "Deuterostome development, Coelomate, post-anal tail, notochord".
Cephalochordates, which include the lancelets, are characterized by the following features:
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Deuterostome development: This is a characteristic of all chordates, including cephalochordates. Deuterostome development refers to the pattern of embryonic development, which includes radial cleavage and the formation of the anus from the blastopore.
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Coelomate: Cephalochordates, like all chordates, are coelomates. This means they have a true coelom, or body cavity, that is lined with mesoderm.
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Post-anal tail: This is another characteristic of all chordates. The post-anal tail is an extension of the body that runs past the anal opening.
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Notochord: The notochord is a flexible rod that provides support in all chordates at some stage of their life. In cephalochordates, the notochord extends along the length of the body, from the head to the post-anal tail.
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