Kingdom Animalia — Biology STD 11 Science — Question
Maharashtra BoardEnglish MediumSTD 11 ScienceBiologyKingdom Animalia2 Marks
Question
Why was phylum Elemichordata earlier considered as a sub phylum of Chordata?
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Answer
Hemiehordata was earlier considered as sub phylum of Chordata because the buccal diverticulum was considered a 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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