Hemichordata is a phylum of bilaterally symmetrical marine deuterostome animals generally considered the sister group of the echinoderms, first appearing in the fossil record in the Lower or Middle Cambrian. It includes two main living classes, the worm-shaped acorn worms of Enteropneusta and the small, mostly colonial, tube-dwelling Pterobranchia, the latter of which now also encompasses the graptolites, once thought entirely extinct but represented today by the living genus Rhabdopleura.
Facts
Taxonomic Rank Scientific Name Member Species/Taxa Count Defining CharacteristicsBody divided into three parts: prosome, mesosome and metasome, with a pharynx perforated by gill slits 1 Identification
Distinguishing AppearanceAcorn worms are solitary, worm-shaped animals 1 Classification
Living or Extinct Connections
Parent Taxon Of
Source Wikidata: Enteropneusta
Source Wikipedia: Cephalodiscus
Sources
1. Hemichordate, Wikipedia
Introduction
Hemichordata ( HEM-ih-kor-DAY-tə) is a phylum which consists of triploblastic, eucoelomate, and bilaterally symmetrical marine deuterostome animals, generally considered the sister group of the echinoderms.
Classification
There are 130 described species of Hemichordata and many new species are being discovered, especially in the deep sea.
Anatomy, body axis
The anteroposterior axis is divided into three parts: the anterior prosome, the intermediate mesosome, and the posterior metasome.
Anatomy, acorn worms
Acorn worms are solitary worm-shaped organisms.
View the Source2. Wikidata (taxon extant/extinct status)
Wikimedia Foundation / Wikidata contributorsQ174301, descriptionView the Source Wikidata: Hemichordata
Wikidata Q174301, class allow-list match (w-wdresolver-0926)View the Source Wikidata: Enteropneusta
Parent Taxon Of: Acorn Worm, Wikidata P171 (parent taxon) claim, rank=normal, target=Q174301 (Hemichordata)View the Source Hemichordate (Wikipedia)
In Group: Minor Animal Phyla, LeadQuote, In Group: Minor Animal Phyla, Lead
Hemichordata ( HEM-ih-kor-DAY-tə) is a phylum which consists of triploblastic, eucoelomate, and bilaterally symmetrical marine deuterostome animals, generally considered the sister group of the echinoderms.
Wikipedia: Cephalodiscus
WikipediaParent Taxon Of: Cephalodiscus, LeadQuote, Parent Taxon Of: Cephalodiscus, Lead
Cephalodiscus is a genus of hemichordates in the family Cephalodiscidae of the order Cephalodiscida.
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