1.

Why Balanoglossus is considered as connecting link between Non-chordates and chordates?

Answer»

Balanoglossus belongs to phylum Hemiehordata.

For Explanation:

1. 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. 

2. It possesses certain characteristics of both Chordates and Non-chordates. 

3. Absence of notochord worm-like body, heart located on the dorsal side are the Non-chordate like characteristics seen in Hemiehordata. 

4. 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 Nonchordata and Chordata.


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