Question

Give classification of hemichordate with suitable.

Answer 1

Hemichordate, any of a group of wormlike marine invertebrates closely related to both chordates and echinoderms and usually considered to constitute a phylum, the Hemichordata. The term Hemichordata—from the Greek hemi, meaning “half,” and chorde, meaning “string,” thus, “half-chordate”—was first proposed because the buccal diverticulum, a tubular outgrowth from the mouth cavity forward into the proboscis, or “snout,” resembled a rudimentary notochord—the dorsal, or back-side, supporting axis of the more primitive vertebrates. This theory has since been rejected, however, because it has been determined that the diverticulum bears little resemblance in origin and function to the vertebrate notochord. Molecular studies indicate that hemichordates are more closely related to echinoderms than to chordates. About 90 species have been described.

Answer 2

hemicordates are worm like animals.
they are included in group deutrostomes.
odd is soft and worm like and is divided into three regions 1. anterior protosome 2. middle mesosome 3. posterior mesosome or proboscis
body wall is made up of unicellular epidermis with mucus secreting cells.
circulatory system is composed of dorsal and ventral vessel
brain occurs in the mesosome
notochord is absent
cleavage is holoblastic and radial
larva is formed during life cycle called tonoria larva
examples of hemicordates are
1. saccoglossus kowalevskii(acorn worm )
2. balanglossus sp.

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