Question
Name the phylum that forms connecting link between Chordates and Non-chordates.
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Answer
- Hemiehordata was earlier considered as sub phylum of Chordata because the buccal diverticulum was considered as notochord. It is now placed as a separate phylum under Non-Chordata.
- It possesses certain characteristics of both Chordates and Non-chordates.
- Absence of notochord worm-like body, heart located on the dorsal side are the Non-chordate like characteristics seen in Hemiehordata.
- Presence of nerve chord, pharyngeal gill slits are some of the Chordate-like characters seen in Hemiehordata.
- Hence, Hemiehordata is considered as a connecting link between Non-chordata and Chordata.
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