Sea Urchin: Difference between revisions
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==References== | |||
== References == | |||
=== 2024 === | === 2024 === | ||
* (Wikipedia, 2024) | * (Wikipedia, 2024) ⇒ https://en.wikipedia.org/wiki/sea_urchin Retrieved:2024-4-24. | ||
** '''[[Sea urchin]]s''' () are [[spine (zoology)|spiny]], globular [[echinoderm]]s in the class '''Echinoidea'''. About 950 species of sea urchin are distributed on the seabeds of every ocean and inhabit every depth zone from the [[intertidal]] seashore down to .<ref name=adw></ref> The spherical, hard shells ([[Test (biology)|tests]]) of sea urchins are round and covered in spines. Most urchin spines range in length from , with outliers such as the [[Diadema antillarum|black sea urchin]] possessing spines as long as . Sea urchins move slowly, crawling with [[tube feet]], and also propel themselves with their spines. Although [[algae]] are the primary diet, sea urchins also eat slow-moving ([[Sessility (motility)|sessile]]) animals. [[Predation|Predators]] that eat sea urchins include a wide variety of fish, [[starfish]], [[crabs]], [[marine mammals]], and humans. <P> Like all echinoderms, adult sea urchins have fivefold symmetry, but their [[Echinoderm#Larval development|pluteus larvae]] feature [[Bilateral symmetry|bilateral (mirror) symmetry]], indicating that the sea urchin belongs to the [[Bilateria]], along with [[chordate]]s, [[arthropod]]s, [[annelid]]s and [[mollusc]]s. Sea urchins are found in every ocean and in every climate, from the [[tropics]] to the [[polar regions]], and inhabit marine benthic (sea bed) habitats, from rocky shores to [[hadal zone]] depths. The fossil record of the ''Echinoids'' dates from the [[Ordovician]] period, some 450 million years ago. The closest echinoderm relatives of the sea urchin are the [[sea cucumber]]s (Holothuroidea), which like them are [[deuterostome]]s, a clade that includes the [[chordate]]s. ([[Sand dollar]]s are a separate order in the sea urchin class Echinoidea.) <P> The animals have been studied since the 19th century as [[model organism]]s in [[developmental biology]], as their embryos were easy to observe. That has continued with studies of their [[genome]]s because of their unusual fivefold symmetry and relationship to chordates. Species such as the [[Eucidaris tribuloides|slate pencil urchin]] are popular in aquaria, where they are useful for controlling algae. Fossil urchins have been used as protective [[amulet]]s. | ** '''[[Sea urchin]]s''' () are [[spine (zoology)|spiny]], globular [[echinoderm]]s in the class '''Echinoidea'''. About 950 species of sea urchin are distributed on the seabeds of every ocean and inhabit every depth zone from the [[intertidal]] seashore down to .<ref name=adw></ref> The spherical, hard shells ([[Test (biology)|tests]]) of sea urchins are round and covered in spines. Most urchin spines range in length from , with outliers such as the [[Diadema antillarum|black sea urchin]] possessing spines as long as . Sea urchins move slowly, crawling with [[tube feet]], and also propel themselves with their spines. Although [[algae]] are the primary diet, sea urchins also eat slow-moving ([[Sessility (motility)|sessile]]) animals. [[Predation|Predators]] that eat sea urchins include a wide variety of fish, [[starfish]], [[crabs]], [[marine mammals]], and humans. <P> Like all echinoderms, adult sea urchins have fivefold symmetry, but their [[Echinoderm#Larval development|pluteus larvae]] feature [[Bilateral symmetry|bilateral (mirror) symmetry]], indicating that the sea urchin belongs to the [[Bilateria]], along with [[chordate]]s, [[arthropod]]s, [[annelid]]s and [[mollusc]]s. Sea urchins are found in every ocean and in every climate, from the [[tropics]] to the [[polar regions]], and inhabit marine benthic (sea bed) habitats, from rocky shores to [[hadal zone]] depths. The fossil record of the ''Echinoids'' dates from the [[Ordovician]] period, some 450 million years ago. The closest echinoderm relatives of the sea urchin are the [[sea cucumber]]s (Holothuroidea), which like them are [[deuterostome]]s, a clade that includes the [[chordate]]s. ([[Sand dollar]]s are a separate order in the sea urchin class Echinoidea.) <P> The animals have been studied since the 19th century as [[model organism]]s in [[developmental biology]], as their embryos were easy to observe. That has continued with studies of their [[genome]]s because of their unusual fivefold symmetry and relationship to chordates. Species such as the [[Eucidaris tribuloides|slate pencil urchin]] are popular in aquaria, where they are useful for controlling algae. Fossil urchins have been used as protective [[amulet]]s. | ||
<references/> | <references/> | ||
Revision as of 02:36, 24 April 2024
A Sea Urchin is a spiny, globular echinoderm.
- See: [[]], Tripneustes Ventricosus, Echinometra Viridis, Perischoechinoidea, Cidaroida, Euechinoidea, Atelostomata, Cassiduloida, Spatangoida, Uni.
References
2024
- (Wikipedia, 2024) ⇒ https://en.wikipedia.org/wiki/sea_urchin Retrieved:2024-4-24.
- Sea urchins () are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin are distributed on the seabeds of every ocean and inhabit every depth zone from the intertidal seashore down to .[1] The spherical, hard shells (tests) of sea urchins are round and covered in spines. Most urchin spines range in length from , with outliers such as the black sea urchin possessing spines as long as . Sea urchins move slowly, crawling with tube feet, and also propel themselves with their spines. Although algae are the primary diet, sea urchins also eat slow-moving (sessile) animals. Predators that eat sea urchins include a wide variety of fish, starfish, crabs, marine mammals, and humans.
Like all echinoderms, adult sea urchins have fivefold symmetry, but their pluteus larvae feature bilateral (mirror) symmetry, indicating that the sea urchin belongs to the Bilateria, along with chordates, arthropods, annelids and molluscs. Sea urchins are found in every ocean and in every climate, from the tropics to the polar regions, and inhabit marine benthic (sea bed) habitats, from rocky shores to hadal zone depths. The fossil record of the Echinoids dates from the Ordovician period, some 450 million years ago. The closest echinoderm relatives of the sea urchin are the sea cucumbers (Holothuroidea), which like them are deuterostomes, a clade that includes the chordates. (Sand dollars are a separate order in the sea urchin class Echinoidea.)
The animals have been studied since the 19th century as model organisms in developmental biology, as their embryos were easy to observe. That has continued with studies of their genomes because of their unusual fivefold symmetry and relationship to chordates. Species such as the slate pencil urchin are popular in aquaria, where they are useful for controlling algae. Fossil urchins have been used as protective amulets.
- Sea urchins () are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin are distributed on the seabeds of every ocean and inhabit every depth zone from the intertidal seashore down to .[1] The spherical, hard shells (tests) of sea urchins are round and covered in spines. Most urchin spines range in length from , with outliers such as the black sea urchin possessing spines as long as . Sea urchins move slowly, crawling with tube feet, and also propel themselves with their spines. Although algae are the primary diet, sea urchins also eat slow-moving (sessile) animals. Predators that eat sea urchins include a wide variety of fish, starfish, crabs, marine mammals, and humans.
- ↑ Cite error: Invalid
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