A nine-armed sea star (Luidia senegalensis) in Indian River Lagoon, Florida, USA
by Arthur Anker
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A nine-armed sea star (Luidia senegalensis) in Indian River Lagoon, Florida, USA
by Arthur Anker

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Uncharismatic Fact of the Day
Most animals need blood to survive, but not starfish! None of the over 2,000 species of sea star have blood, although they do have a circulatory system. To transport oxygen and nutrients through their body, starfish pump seawater through an opening called the madreporite into their bodies. Starfish also use this system to move by contracting various muscles and forcing water into or out of their limbs.
(Image: A cluster of ochre sea stars (Pisaster ochraceus) by David Job)
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Eight-armed sea star (Luidia maculata)
Photo by Loh Kok Sheng
Royal Starfish Astropecten articulatus Source: Here
Plain sand star (Astropecten indicus)
Photo by Loh Kok Sheng

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Southern Sand Star (Luidia australiae)
...a species of Luidiid sea star, which occurs in the waters around southern Australia and New Zealand where it occurs on reefs, seagrass meadows, and sands at depths of ~110 m.Southern sand stars are opportunist predators and will conceal themselves in sand and feed on a range of passing invertebrates.
Classification
Animalia-Echinodermata-Asterozoa-Asteroidea-Paxillosida-Luidiidae-Luidia-L. australiae
Image: Richard Ling
Astropecten articulatus, Paxillosida, Asteroidea, Echinodermata
Astropecten articulatus, Paxillosida, Asteroidea, Echinodermata kaynak: http://bit.ly/1nNUUlW
Astropecten scoparius / モミジガイ
Astropecten scoparius
Astropecten scoparius
モミジガイ
Animalia Echinodermata Asteroidea Paxillosida Astropectinidae 動物界 棘皮動物門 ヒトデ綱 モミジガイ目 モミジガイ科 The picture was taken at Awashima Marine Park, Shizuoka, Japan.