Question

What is the difference between Hemichordata and Chordata?

Answer 1

1. Hemichordata is a phylum of marine invertebrates that comprises acorn worms.
2. Chordates are the animals possessing all four characteristics i.e. notochord, pharyngeal gill slits, dorsal hollow nerve chord and tail.

Hemichordata	Chordata
1. The notochord is not present in the organisms belonging to this phylum.	1.Notochord is present in the organisms belonging to this phylum.
2. Central nervous system is ventral, solid and double.	2. The central nervous system is dorsal, hollow and single.
3. Gill slits are absent.	3. Pharynx perforated by the gill slits
4. The heart is dorsal ( if present ).	4. The heart is ventral.
5. A post-anal part ( tail ) is absent.	5. A post-anal part ( tail ) is present.