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Nahihiagian an salabay sa natanan na kadagatan, mapahibababaw o hilarum. Mayaon pipira na bokya na mahihiagian sa matapsi na tubig. Komon an salabay sa mga baybay sa bug'os na kalibutan. Nagkinalangoy na an salabay sa kadagatan sin diri mahabubo 500 milyones katuig.<ref>[http://www.sciencedaily.com/releases/2007/10/071030211210.htm Fossil Record Reveals Elusive Jellyfish More Than 500 Million Years Old]. ScienceDaily (2007-11-02).</ref> ug posible 700 milyones katuig o malahos pa, ngan sira an pinakaagap na ''multi-organ'' na hayop.<ref name=angier2dec>{{cite news|last=ANGIER|first=NATALIE|title=So Much More Than Plasma and Poison|url=http://www.nytimes.com/2011/06/07/science/07jellyfish.html?_r=1|accessdate=2 December 2011|newspaper=[[The New York Times]]|date=June 6, 2011}}</ref>
 
== Taxonomiya ==
[[File:Largelionsmanejellyfish.jpg|thumb|An lion's mane jellyfish (''Cyanea capillata''), usa na darako na specie san salabay.]]
[[File:Sea Nettle Jelly 1.jpg|thumb|''purple-striped jellyfish'']]
 
Sakob san '''Medusozoa''' an salabay, an clade san mga cnidarian na diri gin'api an [[Anthozoa]] (hal., ''coral'' ngan ''anemone''). Nagsusuwestyon ini na an porma-medusa nag-''evolve'' tikang sa ''polyp''.<ref name="treeoflife">[http://tolweb.org/Cnidaria/ Cnidaria], Tree of Life. ''A comprehensive morphological cladistic analysis by Schuchert (1993) supports the basal position of Anthozoa with the Scyphozoa and Cubozoa being more closely related to each other than to Hydrozoa. Morphological, mtDNA, and 18S rDNA data separately and together also support the basal position of Anthozoa but do not resolve the relationships among Scyphozoa, Cubozoa and Hydrozoa (Bridge et al. 1995).''</ref>
 
An upat na mayor na klase san medusozoa na Cnidaria amo an:
*[[Scyphozoa]],an ginsesering na ungud na salabay.
*[[Cubozoa]], ( o ''bokya'') korte kahon an ''bell'', ngan may ''velarium'' na naayuda para mas malaksi lumangoy.
*[[Hydrozoa]]
*[[Staurozoa]], (''stalked jellyfish'') wara ini ''polyp stage''
 
mga hayop na pirmi naaalahan na medusa na salabay.
*[[Siphonophorae]], sakob sa hydrozoa na ordo. halimbawa an ''[[Portuguese Man o' War]]''.
*[[Ctenophora|Ctenophores]], (''comb jellies'') may ada kalugaringun na phylum sa Cnidaria.
*[[Salp]], myembro san [[chordata]], ngan mas harani na uropod san tawo kaysa san mga cnidaria ngan ''comb jellies''.<ref>[http://www.antarctica.gov.au/about-antarctica/wildlife/animals/salps Salps] (wildlife), Antarctic Division, Australian Government website.</ref>
 
Malahos 200 na specie may'ada an Scyphozoa, harani 50 na specie may'ada an Staurozoa, 20 specie san Cubozoa, ngan an Hydrozoa maabot 1000–1500 na specie na nagproprodyus medusae (ngan mas damo pa na hydrozoa an diri na prodyus medusae).<ref>{{Cite journal|doi=10.1111/j.1744-7410.2004.tb00139.x|last=Marques|first=A.C.|author2=A. G. Collins|year=2004|title=Cladistic analysis of Medusozoa and cnidarian evolution|journal=Invertebrate Biology|volume=123|pages=23–42}}</ref><ref>{{Cite journal|last=Kramp|first=P.L.|year=1961|title=Synopsis of the Medusae of the World|journal=Journal of the Marine Biological Association of the United Kingdom|volume=40|pages=1–469}}</ref>
==mga kasarigan==
{{reflist}}
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