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 (acorn worms), and Pterobranchia. Acorn worms are solitary worm-shaped organisms.

Phylum: Hemichordata; Bateson, 1885

Scientific name: Hemichordata

Higher classification: Deuterostome

Kingdom: Animalia

Rank: Phylum

Subkingdom: Eumetazoa

Unique characteristics

.Characteristic Features of Phylum Hemichordata

Hemichordata is bilaterally symmetrical and triploblastic animal.

.They are exclusively marine animals.

They can be solitary or in colonies.

Hemichordata have a true body cavity or coelom..

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. A third class, Planctosphaeroidea, is known only from the larva of a single species, Planctosphaera pelagica. The extinct class Graptolithina is closely related to the pterobranchs.[1]

Hemichordate

Temporal range: Miaolingian–Recent

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Eichelwurm (cropped).jpg

Acorn worm, a hemichordate.

Scientific classificatione

Kingdom:

Animalia

Subkingdom:

Eumetazoa

Clade:

ParaHoxozoa

Clade:

Bilateria

Clade:

Nephrozoa

Superphylum:

Deuterostomia

Clade:

Ambulacraria

Phylum:

Hemichordata

Bateson, 1885

Classes

Planctosphaeroidea

Enteropneusta

Pterobranchia

Acorn worms are solitary worm-shaped organisms. They generally live in burrows (the earliest secreted tubes)[2] and are deposit feeders, but some species are pharyngeal filter feeders, while the family Torquaratoridae are free living detritivores. Many are well known for their production and accumulation of various halogenated phenols and pyrroles.[3] Pterobranchs are filter-feeders, mostly colonial, living in a collagenous tubular structure called a coenecium.[4]

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