|
Circeaster
''Circeaster'' is a genus of abyssal sea stars in the family Goniasteridae. Habitat and distribution These sea stars have a flattened and broad pentagonal central disc, with 5 tapering arm. The marginal plates are thick and well delimited. They live between 320 and 3000 meters deep, in the three main oceanic basins.Mah, C.L. (2006),Phylogenetic analysis and biogeography of the deep-sea goniasterid, ''Circeaster'' (Echinodermata: Asteroidea) including descriptions of six new species, ''Zoosystema'', 28(4): 917-954. Species list According to World Register of Marine Species:Mah, C. (2014), Circeaster' Koehler, 1909 In: Mah, C.L. (2014) World Asteroidea database. Accessed through: World Register of Marine Species. * ''Circeaster americanus'' (A.H. Clark, 1916) * ''Circeaster arandae'' Mah, 2006 * ''Circeaster helenae'' Mah, 2006 * ''Circeaster kristinae'' Mah, 2006 * ''Circeaster loisetteae'' Mah, 2006 * ''Circeaster magdalenae'' Koehler, 1909 * ''Circeaster marcelli'' Koehler, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Goniasteridae
Goniasteridae (the biscuit stars) constitute the largest family of sea stars, included in the order Valvatida. They are mostly deep-dwelling species, but the family also include several colorful shallow tropical species. Description Goniasteridae are usually middle-sized sea stars with a characteristic double range of marginal plates bordering the disk and arms. Most of them have five arms, often short and triangular, around a broad central disc; many species are pentagonal or subpentagonal, covered densely with granular, seed-like protuberances, hence the name of the family "seed-star" (''gonium+aster''). The aboral face is often covered with tiny spines looking like paxillae. Pedicellariae are often valvate, and the gonads are located at the interradius. Main identification keys for this group include the presence of paxillae, granules, teeth, spines, or the shape and dimensions of marginal plate. Location and habitat They occur predominantly on deep-water continenta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Star
Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea (). Common usage frequently finds these names being also applied to ophiuroids, which are correctly referred to as brittle stars or basket stars. Starfish are also known as asteroids due to being in the class Asteroidea. About 1,900 species of starfish live on the seabed in all the world's oceans, from warm, tropical zones to frigid, polar regions. They are found from the intertidal zone down to abyssal depths, at below the surface. Starfish are marine invertebrates. They typically have a central disc and usually five arms, though some species have a larger number of arms. The aboral or upper surface may be smooth, granular or spiny, and is covered with overlapping plates. Many species are brightly coloured in various shades of red or orange, while others are blue, grey or brown. Starfish have tube feet operated by a hydraulic system and a mouth at the centre of the oral or lower surface. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animal
Animals are multicellular, eukaryotic organisms in the Kingdom (biology), biological kingdom Animalia. With few exceptions, animals Heterotroph, consume organic material, Cellular respiration#Aerobic respiration, breathe oxygen, are Motility, able to move, can Sexual reproduction, reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of Cell (biology), cells, the blastula, during Embryogenesis, embryonic development. Over 1.5 million Extant taxon, living animal species have been Species description, described—of which around 1 million are Insecta, insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from to . They have Ecology, complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology. Most living animal species are in Bilateria, a clade whose members have a Symmetry in biology#Bilate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
