Valvatida is an order of sea stars (Asteroidea), which contains 7 families. The order encompasses both tiny species, which are only a few milimeters large, like those in the genusAsterina, and sea stars, which can reach up to 75 centimeters like those species in the genus Thromidia. Almost all species in this order have 5 arms with tube feet. Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms. ... Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria (coral, jellyfish, anemones) Placozoa (trichoplax) Subregnum Bilateria (bilateral symmetry) Acoelomorpha (basal) Orthonectida (parasitic to flatworms, echinoderms, etc. ... Phyla Subkingdom Parazoa Porifera (sponges) Subkingdom Agnotozoa Placozoa Orthonectida Rhombozoa Subkingdom Metazoa Radiata Cnidaria Ctenophora - Comb jellies Bilateria Protostomia Acoelomorpha Platyhelminthes - Flatworms Nemertina - Ribbon worms Gastrotricha Gnathostomulida - Jawed worms Micrognathozoa Rotifera - Rotifers Acanthocephala Priapulida Kinorhyncha Loricifera Entoprocta Nematoda - Roundworms Nematomorpha - Horsehair worms Cycliophora Mollusca - Mollusks Sipuncula - Peanut worms Annelida - Segmented... Classes Asteroidea Concentricycloidea Crinoidea Echinoidea Holothuroidea Ophiuroidea Echinoderms (Echinodermata) is a phylum of marine animals found in the ocean at all depths. ... A database query syntax error has occurred. ... Scientific classification or biological classification refers to how biologists group and categorize extinct and living species of organisms. ... Orders Forcipulatida Paxillosida Platyasterida Spinulosida Valvatida For the band see Starfish (band). ... Scientific classification or biological classification refers to how biologists group and categorize extinct and living species of organisms. ... See genus (mathematics) for the use of the term in mathematics. ... Wikipedia does not have an article with this exact name. ...
Cushion star (Culcita novaeguineae)
Crown-of-thorns starfish (Acanthaster planci) Binomial name Acanthaster planci [[]], [[]] A Crown-of-Thorns starfish on a reef in Fiji. ... Binomial name Acanthaster planci (Linnaeus, 1758) The crown-of-thorns starfish (Acanthaster planci) is a red-colored starfish with thorn-like spines sprouting all over its body for protection. ...
Red-knobbed Starfish (Protoreaster linckii) Image File history File links Download high resolution version (1800x1286, 744 KB) Red-knobbed Starfish Protoreaster linckii at Bristol Zoo Aquarium, Bristol, England. ...
References
This article is based on a translation of an article from the German Wikipedia.
The slightly younger Triassic genus Noriaster barberoi, diagnosed to the extant family Poraniidae (Valvatida), is the oldest-known fossil species belonging to a surviving family (Blake et al.
In addition, the Valvatida is not monophyletic and a forcipulatid clade falls within a group of valvatids, a velatid and spinulosids, a relationship in stark contrast to that proposed by Blake (1987).
The proposed phylogeny is similar to Blake (1987) in that two lineages (one largely of forcipulatids and the other largely of valvatids) are recovered, but Valvatida and Velatida are not monophyletic and some velatids plus the Spinulosida fall in the forcipulatid clade.
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