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Definition of the noun Acorn Worms
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Printed dictionaries and other books with definitions for Acorn Worms
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by Barbara Charton, John Tietjen
Acorn worms are the most common living organisms in this group. The name Hemichordata was first proposed because the protruding mouthpart was assumed to be a notochord. They are characterized by a three-part body plan: a preoral ...
The Encyclopedia of Animals (2004)
A Complete Visual Guide by Fred Cooke
Phylum Hemichcdata Hemicnordates (acorn worms) Phyhim Chaetognatha A/ row worms Phylum Oastrotncha Gastrotnchs Phylum Kmorttyncha Spiny<rown worms ...
Choice Dictionary of Biology (2010)
by Sanjay Yadav
Hemichordata: A phylum of soft-bodied marine invertebrates that comprises two classes: the Enteropneusta (acorn worms), which are cylindrical burrowing animals; and the Pterobranchia, which are colonial forms with vaseshaped bodies.
by Michael Allaby
Hemichordata (acorn worms) Phylum first encountered in the Middle 'Cambrian ' Burgess Shale, British Columbia, Canada. The acorn worms are related to the ' chordates, for although they lack a 'notochord, the gill slits are very similar to those ...
A Dictionary of Zoology (2014)
by Michael Allaby
acorn worms See ENTEROPNEUSTA. acousticolateralis system The innerear region and * lateralline organs located in the skin, forming a sensory system that conveys environmental information to ...
A Dictionary of Genetics (2006)
by Robert C. King, William D. Stansfield, Pamela Khipple Mulligan
branch Hemichordata ( acorn worms and pterobranchs) branch Urochordata (tunicates) branch Ct- phalochordata (lancelets, Branchiostoma) subphylum Craniata (q.v.) branch Agnatha ...
by Scott Dowding
angiotensin converting enzyme, acorn worms—n. 1. any of the worrnlike marine animals that belong to the phylum Hemichordata, possessing gill slits and an acorn-shaped proboscis and collar, active continental margin—n. 1. a continental ...
by John W. Blunt, Murray H. G. Munro
consisting of two surviving types of organism; the acorn worms (Enteropneusts) inhabiting temperate and tropical waters, and the ...
Encyclopedia of Biology (2009)
by Don Rittner, Timothy Lee McCabe
hemichordates Consisting of only a few hundred species, the hemichordates include the acorn worms 160 hemochromatosis (e.g., Saccoglossus), which burrow in sand and mud,
by The University of Chicago Press, Leszek Kołakowski
and Hemichordata (acorn worms). chorion Outermost of the protective membranes of the embryonic system of birds, reptiles or ...
by Hanneke(J.)G. Baretta-Bekker, Egbert K. Duursma, Bouwe R. Kuipers
Wormlike marine animals subdivided into Enteropneusta (acorn worms) and Pterobranchia. Enteropneusta have ...
Jawed vertebrates Vertebrata Agnathostomata Jawless vertebrates Tunicata Cephalochordata Amphioxus Ciona Hemichordata Acorn worms Echinodermata Arthropoda Insects Crustaceans Nematoda Roundworms Annelida Earthworms ...
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Ancient Fossil looks like Today's Acorn Worms
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