Sea stars or starfish are marine invertebrates belonging to Kingdom Animalia and phylum Echinodermata, class Asteroidea. The names sea star and starfish are also used for the closely related brittle stars, which make up the class Ophiuroidea. They exhibit a superficially radial symmetry. Starfish typically have five or more "arms" which radiate from an indistinct disk (pentaradial symmetry). In fact, their evolutionary ancestors are believed to have had bilateral symmetry, and sea stars do exhibit some superficial remnant of this body structure.

Sea stars do not have movable skeletons, but instead possess a hydraulic water vascular system. The water vascular system has many projections called tube feet, located on the ventral face of the sea star's arms, which function in locomotion and aid with feeding.

As these creatures are echinoderms and not actually fish, most marine biologists prefer to replace the term starfish with the less misleading term sea star.

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http://twitpic.com/wvgi6 - Wednesday Photo: Can you believe these starfish were shot in Kenya? Some of Africa's best beaches!
Go2Africa (Go2Africa) Wed, 06 Jan 2010 05:50:28 -0000
http://twitpic.com/wvgi6 - Wednesday Photo: Can you believe these starfish were shot in Kenya? Some of Africa's best beaches!
Being anyone other than my Starfish Syd #willgetyourejected
Firesoul89 (Gerard Yee) Wed, 06 Jan 2010 05:47:06 -0000
Being anyone other than my Starfish Syd #willgetyourejected
@TheAlexKlein who./wats Patrick?Are we talking a pink starfish?
INAHAM (Antonio Shanks) Wed, 06 Jan 2010 05:45:05 -0000
@TheAlexKlein who./wats Patrick?Are we talking a pink starfish?
@GalenGering yeah inquiring minds want to know! Starfish or no? LOL
GalenShawnGirl (Cyndi) Wed, 06 Jan 2010 05:29:41 -0000
@GalenGering yeah inquiring minds want to know! Starfish or no? LOL
Q:Favorite type of pet? (cats, dogs, e... A:Loved my dog Starfish for 16 years t... http://formspring.me/xDrewxDuhx/q/27129723 #formspringme
xDrewxDuhx (Drew Scott) Wed, 06 Jan 2010 05:24:21 -0000
Q:Favorite type of pet? (cats, dogs, e... A:Loved my dog Starfish for 16 years t... http://formspring.me/xDrewxDuhx/q/27129723 #formspringme
@Speakstinycat jellyfish loveS you starfish ILOVE YOU!! xD es genial, en serio amo a charlie XD
ixtabae (Caro) Wed, 06 Jan 2010 05:23:21 -0000
@Speakstinycat jellyfish loveS you starfish ILOVE YOU!! xD es genial, en serio amo a charlie XD

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