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• Protoreaster_nodosus abstract "Protoreaster nodosus is a species of sea star found in the warm, shallow waters of the Indo-Pacific region. Also known as "horned" or "Chocolate Chip" sea stars, they possess rows of spines or "horns"; black conical points arranged in a single row, radially on the dorsal side, which may erode and become blunt. These dark protrusions are used to scare away possible predators, by looking frightening or dangerous. On the ventral side, tube feet, purple in color (or pale, transparent pink), are arranged in rows on each arm. Most horned sea stars found are a roughly rigid five-pointed star-shape with tapering arms to the end, although there are anomalies like four or six-armed specimens; they may grow up to 30 centimetres in diameter. The sea stars are usually colored in shades of red or brown, but can be light tan, the color of cookie dough. This appearance, combined with the small horns on its dorsal side, give the sea star a look similar to that of a bumpy cookie. Horned sea stars prefer sheltered, sandy or slightly muddy bottoms more than hard substrata such as coral reef, and are frequently sighted conspicuously between the leaves of seagrasses on sea grass meadows or on blank stretch of coral sand. In shallow water, this species can be seen intertidally, occasionally exposed to the low tide. they do not withstand rapid changes well, however, and usually keep themselves underwater. In aquariums, these sea stars like to climb around on glass and also filters, which they can disrupt. Sometimes, many individuals of this species can be seen gathering on soft bottom with reason not very well known, probably to increase the chance of fertilization when spawning or simply a suitable feeding ground.Horned sea stars seem to be opportunistic carnivores; adults are known to predate on most sessile life forms including hard corals and sponges in aquarium. In this same setting, they will hunt down snails and eat them. An individual of horned sea star also has been observed eating a sea urchin in their natural habitat. In public aquariums, these stars are sometimes target-fed with chopped squids, clams or shrimps, and are popular animals for touch pools as it is moderately large in number in some undisturbed areas. Horned sea stars need perfect water condition, suitable diet and proper acclimatization to thrive - thus, these sea stars did not fare very well, caused by several factors mentioned before in many home aquariums. In reef aquariums, they are regarded as undesirable as they have destructive tendencies of toppling decors and digesting patches of corals and sessile organisms; they are reasonably safe if kept in a fish-only aquarium. However, the sea stars are desirable for their cute appearance and relatively non-aggressive behavior. In many tropical Asian and Pacific countries, horned sea stars are collected for sea shell trade for their ornate skeletons. In some areas overharvesting is an issue and reduces greatly the population of the echinoderms. A related species, the Atlantic Oreaster reticulatus, commonly known as Bahama Sea Star, is also a once-abundant species reduced in number due to the continuous harvesting by the industry and tourists alike. As with other tropical echinoderms, commensal animals like shrimps (of genus Periclimenes), tiny brittle stars and even juvenile filefish can be found on the surfaces of a horned sea star. This may be attributed to its protective nature, as there are few predators that would dare to eat this echinoderm.".
• Protoreaster_nodosus binomialAuthority Carl_Linnaeus.
• Protoreaster_nodosus class Starfish.
• Protoreaster_nodosus family Oreasteridae.
• Protoreaster_nodosus genus Protoreaster.
• Protoreaster_nodosus kingdom Animal.
• Protoreaster_nodosus order Valvatida.
• Protoreaster_nodosus phylum Echinoderm.
• Protoreaster_nodosus thumbnail Protoreaster_nodosus.jpg?width=300.
• Protoreaster_nodosus wikiPageExternalLink protoreaster.htm.
• Protoreaster_nodosus wikiPageID "5810988".
• Protoreaster_nodosus wikiPageRevisionID "596187104".
• Protoreaster_nodosus binomial "Protoreaster nodosus".
• Protoreaster_nodosus classis Starfish.
• Protoreaster_nodosus familia Oreasteridae.
• Protoreaster_nodosus genus Protoreaster.
• Protoreaster_nodosus hasPhotoCollection Protoreaster_nodosus.
• Protoreaster_nodosus name "Horned Sea Star".
• Protoreaster_nodosus ordo Valvatida.
• Protoreaster_nodosus phylum Echinoderm.
• Protoreaster_nodosus regnum "Animalia".
• Protoreaster_nodosus species "P. nodosus".
• Protoreaster_nodosus subject Category:Animals_described_in_1758.
• Protoreaster_nodosus subject Category:Asteroidea.
• Protoreaster_nodosus type Animal100015388.
• Protoreaster_nodosus type AnimalsDescribedIn1758.
• Protoreaster_nodosus type LivingThing100004258.
• Protoreaster_nodosus type Object100002684.
• Protoreaster_nodosus type Organism100004475.
• Protoreaster_nodosus type PhysicalEntity100001930.
• Protoreaster_nodosus type Whole100003553.
• Protoreaster_nodosus type Animal.
• Protoreaster_nodosus type Eukaryote.
• Protoreaster_nodosus type Species.
• Protoreaster_nodosus type Organism.
• Protoreaster_nodosus comment "Protoreaster nodosus is a species of sea star found in the warm, shallow waters of the Indo-Pacific region. Also known as "horned" or "Chocolate Chip" sea stars, they possess rows of spines or "horns"; black conical points arranged in a single row, radially on the dorsal side, which may erode and become blunt. These dark protrusions are used to scare away possible predators, by looking frightening or dangerous.".
• Protoreaster_nodosus label "Knotiger Walzenseestern".
• Protoreaster_nodosus label "Protoreaster nodosus".
• Protoreaster_nodosus label "Protoreaster nodosus".
• Protoreaster_nodosus label "Protoreaster nodosus".
• Protoreaster_nodosus sameAs Knotiger_Walzenseestern.
• Protoreaster_nodosus sameAs Protoreaster_nodosus.
• Protoreaster_nodosus sameAs Protoreaster_nodosus.
• Protoreaster_nodosus sameAs m.0f6fm1.
• Protoreaster_nodosus sameAs Q1777525.
• Protoreaster_nodosus sameAs Q1777525.
• Protoreaster_nodosus sameAs Protoreaster_nodosus.
• Protoreaster_nodosus wasDerivedFrom Protoreaster_nodosus?oldid=596187104.
• Protoreaster_nodosus depiction Protoreaster_nodosus.jpg.
• Protoreaster_nodosus isPrimaryTopicOf Protoreaster_nodosus.
• Protoreaster_nodosus name "Horned Sea Star".