“Coelenterata”的意思、由来-开放百科全书

Coelenterata is an obsolete term encompassing the animal phyla Cnidaria (coral animals, true jellies, sea anemones, sea pens, and their allies) and Ctenophora (comb jellies). The name comes from {{lang-grc|κοῖλος|koilos|hollow}} and {{lang|grc|ἔντερον}}, enteron, 'intestine', referring to the hollow body cavity common to these two phyla.^[1]^[2] They have very simple tissue organization, with only two layers of cells (external and internal), and radial symmetry. Some examples are corals, which are typically colonial, and hydra, jelly fish and sea anemones which are solitary. Coelenterata lack a specialized circulatory system relying instead on diffusion across the tissue layers.

Characteristics

All coelenterates are aquatic, mostly marine. The bodyform is radially symmetrical, diploblastic and does not have a coelom. The body has a single opening, the hypostome, surrounded by sensory tentacles equipped with either nematocysts or colloblasts to capture mostly planktonic prey. These tentacles are surrounded by a spacious cavity called the gastrovascular cavity or coelenteron. Digestion is both intracellular and extracellular. Respiration and excretion are accomplished by simple diffusion. A network of nerves is spread throughout the body. Many Cnidaria exhibit polymorphism, wherein different types of individuals are present in a colony for different functions. These individuals are called Zooids. These animals generally reproduce asexually by budding, though sexual reproduction does occur in some groups.

History of classification

The scientific validity of the term coelenterate is currently disputed, as the Cnidaria and Ctenophora have less in common than previously assumed.^[3] Coelentera may only be monophyletic if both Placozoa and Bilateria are included.^[4] In particular, the phylogenetic position of Ctenophora is controversial; it was first considered a sub-group of coelenterata but Hyman regarded it as a separate phylum.^[4]^[5] Some researchers suggest that Coelenterata is not monophyletic, and therefore any group containing Cnidaria and Ctenophora but excluding other phyla would be paraphyletic. However, some genomic studies have found support for monophyletic coelenterates.^[6]^[7] Despite this uncertainty, the term coelenterate is still used in informal settings to refer to the Cnidaria and Ctenophora.

Complicating the issue is the 1997 work of Lynn Margulis (revising an earlier model by Thomas Cavalier-Smith) that placed the Cnidaria and Ctenophora alone in the branch Radiata within Eumetazoa.^[8] (The latter refers to all the animals except the sponges, Trichoplax, and the still poorly understood Mesozoa.) Neither grouping is accepted universally;^[9] however, both are commonly encountered in taxonomic literature.^[3]^[6]

References

1. ^{{cite web|title=coelenterate - definition of coelenterate in English {{!}} Oxford Dictionaries|url=https://en.oxforddictionaries.com/definition/coelenterate|website=Oxford Dictionaries {{!}} English|accessdate=25 February 2017}}
2. ^{{cite web|title=Definition of COELENTERATE|url=https://www.merriam-webster.com/dictionary/coelenterate|website=www.merriam-webster.com|publisher=Merriam-Webster|accessdate=25 February 2017|language=en}}
3. ^¹{{cite journal|last1=Dunn|first1=Casey W.|last2=Leys|first2=Sally P.|last3=Haddock|first3=Steven H.D.|title=The hidden biology of sponges and ctenophores|journal=Trends in Ecology & Evolution|date=May 2015|volume=30|issue=5|pages=282–291|doi=10.1016/j.tree.2015.03.003}}
4. ^¹{{Cite journal|last=Pisani|first=Davide|last2=Pett|first2=Walker|last3=Dohrmann|first3=Martin|last4=Feuda|first4=Roberto|last5=Rota-Stabelli|first5=Omar|last6=Philippe|first6=Hervé|last7=Lartillot|first7=Nicolas|last8=Wörheide|first8=Gert|date=2015-12-15|title=Genomic data do not support comb jellies as the sister group to all other animals|url=http://www.pnas.org/content/112/50/15402|journal=Proceedings of the National Academy of Sciences|language=en|volume=112|issue=50|pages=15402–15407|doi=10.1073/pnas.1518127112|issn=0027-8424|pmc=4687580|pmid=26621703|bibcode=2015PNAS..11215402P}}
5. ^{{Cite journal|title = Error, signal, and the placement of Ctenophora sister to all other animals|url = http://www.pnas.org/content/112/18/5773|journal = Proceedings of the National Academy of Sciences|date = 2015-05-05|issn = 0027-8424|pmc = 4426464|pmid = 25902535|pages = 5773–5778|volume = 112|issue = 18|doi = 10.1073/pnas.1503453112|first = Nathan V.|last = Whelan|first2 = Kevin M.|last2 = Kocot|first3 = Leonid L.|last3 = Moroz|first4 = Kenneth M.|last4 = Halanych|bibcode = 2015PNAS..112.5773W}}
6. ^¹{{Cite journal|title = Phylogenomics Revives Traditional Views on Deep Animal Relationships|url = http://www.cell.com/article/S0960982209008057/abstract|journal = Current Biology|issn = 0960-9822|pmid = 19345102|pages = 706–712|volume = 19|issue = 8|doi = 10.1016/j.cub.2009.02.052|first = Hervé|last = Philippe|first2 = Romain|last2 = Derelle|first3 = Philippe|last3 = Lopez|first4 = Kerstin|last4 = Pick|first5 = Carole|last5 = Borchiellini|first6 = Nicole|last6 = Boury-Esnault|first7 = Jean|last7 = Vacelet|first8 = Emmanuelle|last8 = Renard|first9 = Evelyn|last9 = Houliston|date=April 2009}}
7. ^{{Cite journal|title = Deep metazoan phylogeny: When different genes tell different stories|url = http://www.sciencedirect.com/science/article/pii/S1055790313000298|journal = Molecular Phylogenetics and Evolution|date = 2013-04-01|pages = 223–233|volume = 67|issue = 1|doi = 10.1016/j.ympev.2013.01.010|first = Tetyana|last = Nosenko|first2 = Fabian|last2 = Schreiber|first3 = Maja|last3 = Adamska|first4 = Marcin|last4 = Adamski|first5 = Michael|last5 = Eitel|first6 = Jörg|last6 = Hammel|first7 = Manuel|last7 = Maldonado|first8 = Werner E. G.|last8 = Müller|first9 = Michael|last9 = Nickel|pmid=23353073}}
8. ^Margulis, Lynn and Karlene V. Schwartz, 1997, Five Kingdoms: An Illustrated Guide to the Phyla of Life on Earth, W.H. Freeman & Company, {{ISBN|0-613-92338-3}}
9. ^[https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Tree&id=6072&lvl=3&p=mapview&p=has_linkout&p=blast_url&p=genome_blast&lin=f&keep=1&srchmode=1&unlock NCBI Taxonomy Browser]