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Slate Pencil Urchin (other)
Slate pencil urchin (named after slate pencil) is a common name for several sea urchin species with blunt spines: * ''Eucidaris'', a genus with several tropical species, especially: ** ''Eucidaris thouarsii'', an East Pacific species ** ''Eucidaris tribuloides'', an Atlantic species * ''Heterocentrotus ''Heterocentrotus'' is a genus of the familia Echinometridae. They are mainly found in the Indo-Pacific basin, especially in Reunion or Hawaii. This genus appeared in the Miocene and spread throughout the warm Indo-Pacific. Description ''Hete ...'', a genus with two Indo-Pacific species {{disambiguation Animal common name disambiguation pages ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Slate Pencil
A slate is a thin piece of hard flat material, historically slate stone, which is used as a medium for writing on. Writing on a slate is impermanent and easily erased, and the same slate is then reused. Usage The writing slate consisted of a piece of slate, typically either 4x6 inches or 7x10 inches, encased in a wooden frame. Split slate was prepared by scraping with a steel edge, grinding with a flat stone and, finally, polishing with a mix of slate powder in water. Pencils were of a softer stone, such as shale, chalk or soapstone. In 1853 Charles Goodyear patented a compound of hard-vulcanised rubber with powdered porcelain, from which to make white pencils for writing on slates. Usually, a piece of cloth or slate sponge, sometimes attached with a string to the bottom of the writing slate, was used to erase it for reuse. History The exact origins of the writing slate remain unclear. References to its use can be found in the fourteenth century and evidence suggests that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eucidaris
''Eucidaris'' is a genus of cidaroid sea urchins known as slate pencil urchins (named after slate pencil). They are characterised by a moderately thick test, a usually monocyclic apical disc, perforate and non-crenulate tubercles and nearly straight ambulacra with horizontal pore pairs. The primary spines are few and widely spaced, stout with blunt flat tips and beaded ornamentation and the secondary spines are short and apressed. They originated in the Miocene and extant members of the genus are found in the tropical Indo-Pacific Ocean, East Pacific, Atlantic Ocean and Caribbean Sea. Species The World Register of Marine Species lists the following species: * '' Eucidaris australiae'' Mortensen, 1950 * † '' Eucidaris coralloides'' Fell, 1954 * '' Eucidaris galapagensis'' Döderlein, 1887 * '' Eucidaris metularia'' (Lamarck, 1816) * † '' Eucidaris strobilata'' Fell, 1954 * '' Eucidaris thouarsii'' (Agassiz & Desor, 1846) * '' Eucidaris tribuloides'' (Lamarck Jean-B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eucidaris Thouarsii
''Eucidaris thouarsii'', the slate pencil urchin (named after slate pencil), is a species of cidaroid sea urchins that inhabits littoral regions of the East Pacific Ocean. Distribution and habitat ''Eucidaris thouarsii'' is found in the East Pacific at depths of , ranging from Baja California to Panama, as well as Cocos Island, Clipperton Island and the Galápagos Islands. The Galápagos, Clipperton and Cocos populations are now often recognized as a separate species, '' E. galapagensis'', instead of a subspecies of ''E. thouarsii''. Diet Like all urchins these are primarily herbivores, but feed on a wide range of invertebrates. This species has a high nutrient absorption efficiency when it comes to the coral Pocillopora damicornis ''Pocillopora damicornis'', commonly known as the cauliflower coral or lace coral, is a species of stony coral in the family Pocilloporidae. It is native to tropical and subtropical parts of the Indian and Pacific Oceans. Description ''P. dami ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eucidaris Tribuloides
''Eucidaris tribuloides'', the slate pencil urchin (named after slate pencil), is a species of cidaroid sea urchins that inhabits littoral regions of the Atlantic Ocean. As a member of the basal echinoid order Cidaroida, its morphological, developmental and molecular genetic characteristics make it a phylogenetically interesting species. Taxonomy ''Eucidaris tribuloides'' was first described and classified by Jean Baptiste Lamarck in 1816 as ''Cidarites tribuloides''. The modern classification stems from the echinoid treatises by Pomel in 1883 and by Döderlein in 1887. Distribution and habitat The slate pencil urchin can be found on both sides of the Atlantic, and throughout the Caribbean. On the western side of the Atlantic, the slate pencil urchin has been found as far north as Cape Hatteras, North Carolina, and as far south as Rio de Janeiro. In the Gulf of Mexico, populations have been reported at Alacran Reef, Campeche Bank. On the eastern side of the Atlan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heterocentrotus
''Heterocentrotus'' is a genus of the familia Echinometridae. They are mainly found in the Indo-Pacific basin, especially in Reunion or Hawaii. This genus appeared in the Miocene and spread throughout the warm Indo-Pacific. Description ''Heterocentrotus'' are brightly colored tropical sea urchins with very thick spines that have given them the nickname "slate pencil urchin (other), slate pencil urchins", named after slate pencil.. The genus consists of sea urchins with rounded (but slightly elliptical) Test (biology), test, with the peristome (mouth) located in the center of the oral surface (lower) and the periproct at opposite, at the apex of the aboral (upper) face. The apical disc is dicyclic, with a reduced periproct. The peristome is also reduced and elliptical, with limited mouth notches. The Ambulacrum (anatomy), ambulacrum are polygeminate, with between 9 and 14 pairs of pores per plate, arranged in more or less regular arcs, sometimes almost in bands. All ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
