Question

what is hemichordata??????​

Answer 1

Hemichordata is a phylum of marine deuterostome animals, generally considered the sister group of the echinoderms. They appear in the Lower or Middle Cambrian and include two main classes: Enteropneusta, and Pterobranchia.

Phylum: Hemichordata; Bateson, 1885

Scientific name: Hemichordata

Higher classification: Deuterostome

Kingdom: Animalia

Rank: Phylum

Subkingdom: Eumetazoa

Unique characteristics

Characteristic Features of Phylum Hemichordata

1.Hemichordata is bilaterally symmetrical and triploblastic animal.

2.They are exclusively marine animals.

3.They can be solitary or in colonies.

4.Hemichordata have a true body cavity or coelom.

Number

There are 130 described species of Hemichordata and many new species are being discovered, especially in the deep sea.

Family

The extant members of the phylum Hemichordata (formerly called Stomochordata) number about 92 and are typically divided into three classes:

1.Enteropneusta or acorn worms: four families;

2.Pterobranchia or pterobranchs: three families; and.

3.Planctosphaeroidea: one family.

Answer 2

Hemichordata /ˌhɛmikɔːrˈdeɪtə/ is a phylum of marine deuterostome animals, generally considered the sister group of the echinoderms. They appear in the Lower or Middle Cambrian and include two main classes: Enteropneusta (acorn worms), and Pterobranchia. ... Acorn worms are solitary worm-shaped organisms.

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