What are Prechordates, their general characteristics and why Pterobranchian members are known as acorn worms
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The acorn worms or Enteropneusta are a hemichordate class of invertebrates consisting of one order of the same name. Their closest relatives are the echinoderms. There are 111 known species of acorn worm in the world, the main species ... One theory is that the three-part body originates from an early common ancestor ...
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An animal considered to represent an evolutionary stage ancestral to the chordates.
Pleurobrachia is a common genus of Ctenophora. Along with the genus Hormiphora, it generally has the common name sea gooseberry. Wikipedia
Phylum: Ctenophora
Scientific name: Pleurobrachia
Order: Cydippida
Rank: Genus
Higher classification: Pleurobrachiidae
Class: Tentaculata
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