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Epiactis Japonica
''Epiactis'' is a genus of sea anemones in the family Actiniidae. There are about nineteen recognised species and the type species is ''Epiactis prolifera''. Taxonomy A revision in 1989 determined that the genus ''Cnidopus'' was a synonym of ''Epiactis''. At this time, two new species, ''E. lisbethae'' and ''E. fernaldi'' were described and ''E. ritteri'' was restored to the genus in which it was originally placed. Four species of ''Epiactis'' are known from the Pacific coast of North America, the external brooders ''E. prolifera'' and ''E. lisbethae'' which differ in sexuality and brooding periodicity, and the internal brooders ''E. ritteri'' and ''E. fernaldi'', which differ in their cnidocyte armoury, sexuality and histology. Species * ''Epiactis adeliana'' Carlgren & Stephenson, 1929 * '' Epiactis arctica'' (Verrill, 1868) * ''Epiactis australiensis'' Carlgren, 1950 * '' Epiactis brucei'' Carlgren, 1939 * '' Epiactis fecunda'' (Verrill, 1899) * '' Epiactis fernaldi'' F ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Addison Emery Verrill
Addison Emery Verrill (February 9, 1839 – December 10, 1926) was an American invertebrate zoologist, museum curator and university professor. Life Verrill was born on February 9, 1839 in Greenwood, Maine, the son of George Washington Verrill and Lucy (Hillborn) Verrill. As a boy he showed an early interest in natural history, building collections of rocks and minerals, plants, shells, insects and other animals. When he moved with his family to Norway, Maine at age fourteen he attended secondary school at the Norway Liberal Institute. Verrill started college in 1859 at Harvard University and studied under Louis Agassiz. He graduated in 1862 with a B.A. He went on scientific collecting trips with Alpheus Hyatt and Nathaniel Shaler in the summer of 1860 to Trenton Point, Maine and Mount Desert Island and in the summer of 1861 to Anticosti Island and Labrador. In 1864 Verrill made reports on mining, or prospective mining, properties in New Hampshire, New York, and Pennsylvania. Tw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epiactis Irregularis
''Epiactis'' is a genus of sea anemones in the family Actiniidae. There are about nineteen recognised species and the type species is ''Epiactis prolifera''. Taxonomy A revision in 1989 determined that the genus ''Cnidopus'' was a synonym of ''Epiactis''. At this time, two new species, ''E. lisbethae'' and ''E. fernaldi'' were described and ''E. ritteri'' was restored to the genus in which it was originally placed. Four species of ''Epiactis'' are known from the Pacific coast of North America, the external brooders ''E. prolifera'' and ''E. lisbethae'' which differ in sexuality and brooding periodicity, and the internal brooders ''E. ritteri'' and ''E. fernaldi'', which differ in their cnidocyte armoury, sexuality and histology. Species * '' Epiactis adeliana'' Carlgren & Stephenson, 1929 * '' Epiactis arctica'' (Verrill, 1868) * ''Epiactis australiensis'' Carlgren, 1950 * '' Epiactis brucei'' Carlgren, 1939 * '' Epiactis fecunda'' (Verrill, 1899) * '' Epiactis fernaldi'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mesentery (zoology)
In zoology, a mesentery is a membrane inside the body cavity of an animal. The term identifies different structures in different phylum, phyla: in vertebrates it is a double fold of the peritoneum enclosing the intestines; in other organisms it forms complete or incomplete partitions of the body cavity, whether that is the coelom or, as in the Anthozoa, the gastrovascular cavity. The word "mesentery" is derived from the Greek ''mesos'', "in the middle" and ''enteron'', an "intestine". Vertebrates In vertebrates, a mesentery is a membrane consisting of a double fold of peritoneum that encloses the intestines and their associated organs and connect them with the dorsal wall of the abdominal cavity. In invertebrates, a mesentery is a support or partition in a body cavity serving a similar function to the mesenteries of vertebrates. Bilateria In Bilateria, bilaterally symmetrical organisms there is often a major mesentery separating the two halves of the coelom. In segmented orga ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tentacle
In zoology, a tentacle is a flexible, mobile, and elongated organ present in some species of animals, most of them invertebrates. In animal anatomy, tentacles usually occur in one or more pairs. Anatomically, the tentacles of animals work mainly like muscular hydrostats. Most forms of tentacles are used for grasping and feeding. Many are sensory organs, variously receptive to touch, vision, or to the smell or taste of particular foods or threats. Examples of such tentacles are the eyestalks of various kinds of snails. Some kinds of tentacles have both sensory and manipulatory functions. A tentacle is similar to a cirrus, but a cirrus is an organ that usually lacks the tentacle's strength, size, flexibility, or sensitivity. A nautilus has cirri, but a squid has tentacles. Invertebrates Molluscs Many molluscs have tentacles of one form or another. The most familiar are those of the pulmonate land snails, which usually have two sets of tentacles on the head: when extended ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sphincter
A sphincter is a circular muscle that normally maintains constriction of a natural body passage or orifice and which relaxes as required by normal physiological functioning. Sphincters are found in many animals. There are over 60 types in the human body, some microscopically small, in particular the millions of precapillary sphincters. Sphincters relax at death, often releasing fluids and faeces. Functioning Each sphincter is associated with the lumen (opening) it surrounds. As long as the sphincter muscle is contracted, its length is shortened and the lumen is constricted (closed). Relaxation of the muscle causes it to lengthen, opening the lumen and allowing the passage of liquids, solids, or gases. This is evident, for example, in the blowholes of numerous marine mammals. Many sphincters are used every day in the normal course of digestion. For example, the lower oesophageal sphincter (or cardiac sphincter), which resides at the top of the stomach, is closed most of the time ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epiactis Vincentina
''Epiactis'' is a genus of sea anemones in the family Actiniidae. There are about nineteen recognised species and the type species is ''Epiactis prolifera''. Taxonomy A revision in 1989 determined that the genus ''Cnidopus'' was a synonym of ''Epiactis''. At this time, two new species, ''E. lisbethae'' and ''E. fernaldi'' were described and ''E. ritteri'' was restored to the genus in which it was originally placed. Four species of ''Epiactis'' are known from the Pacific coast of North America, the external brooders ''E. prolifera'' and ''E. lisbethae'' which differ in sexuality and brooding periodicity, and the internal brooders ''E. ritteri'' and ''E. fernaldi'', which differ in their cnidocyte armoury, sexuality and histology. Species * '' Epiactis adeliana'' Carlgren & Stephenson, 1929 * '' Epiactis arctica'' (Verrill, 1868) * ''Epiactis australiensis'' Carlgren, 1950 * '' Epiactis brucei'' Carlgren, 1939 * '' Epiactis fecunda'' (Verrill, 1899) * '' Epiactis fernaldi'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epiactis Thompsoni
''Epiactis thompsoni'', the red-striped anemone, is a species of marine invertebrate in the family Actiniidae, found in New Zealand and South Australia. They are commonly found in the rocky intertidal zone. Description and habitat The red-striped anemone is relatively large, up to 75 mm. The pedal disc protrudes at the base, diameter of the disc is up to 45 mm. Red and white stripes run vertically up the body, the white sometimes turning a strong yellow or even lime green near the elevated mouth. 60 or so tentacles are arranged in 3 whorls A whorl ( or ) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs). Whorls in nature File:Photograph and axial plane floral ..., are usually white with a mauve tip and can be up to 25 mm long. Habits rock pools around the low tide mark, adhering to stones and boulders. Broods its young. Reproduction ''Epiactis thompso ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epiactis Ritteri
''Epiactis ritteri'', the sandy anemone or Ritter's brooding anemone, is a species of sea anemone in the family Actiniidae. It is found in the Pacific Ocean on the western coast of North America in the shallow sub-littoral zone. Description ''Epiactis ritteri'' is very flat when retracted with a wide, flared pedal base, and can measure wide and high. The column is unarmed with acontia and has no tubercles, but has some small adhesive warts to which sand or other fragments may stick. There may be radiating lines on the pedal disc at the base of the column. There are broad white markings on the oral disc near the base of the tentacles but these do not extend as far as the mouth, a fact which distinguishes it from the rather similar ''Epiactis prolifera''. The general colour of this anemone is reddish-brown to brown. Biology It is likely that this species is largely inbred because it does not have a planktonic stage in its life history. It is a simultaneous hermaphrodite, produci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epiactis Novozealandica
''Epiactis'' is a genus of sea anemones in the family Actiniidae. There are about nineteen recognised species and the type species is ''Epiactis prolifera''. Taxonomy A revision in 1989 determined that the genus ''Cnidopus'' was a synonym of ''Epiactis''. At this time, two new species, ''E. lisbethae'' and ''E. fernaldi'' were described and ''E. ritteri'' was restored to the genus in which it was originally placed. Four species of ''Epiactis'' are known from the Pacific coast of North America, the external brooders ''E. prolifera'' and ''E. lisbethae'' which differ in sexuality and brooding periodicity, and the internal brooders ''E. ritteri'' and ''E. fernaldi'', which differ in their cnidocyte armoury, sexuality and histology. Species * '' Epiactis adeliana'' Carlgren & Stephenson, 1929 * '' Epiactis arctica'' (Verrill, 1868) * ''Epiactis australiensis'' Carlgren, 1950 * '' Epiactis brucei'' Carlgren, 1939 * '' Epiactis fecunda'' (Verrill, 1899) * '' Epiactis fernaldi'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epiactis Nordmanni
''Epiactis'' is a genus of sea anemones in the family Actiniidae. There are about nineteen recognised species and the type species is ''Epiactis prolifera''. Taxonomy A revision in 1989 determined that the genus ''Cnidopus'' was a synonym of ''Epiactis''. At this time, two new species, ''E. lisbethae'' and ''E. fernaldi'' were described and ''E. ritteri'' was restored to the genus in which it was originally placed. Four species of ''Epiactis'' are known from the Pacific coast of North America, the external brooders ''E. prolifera'' and ''E. lisbethae'' which differ in sexuality and brooding periodicity, and the internal brooders ''E. ritteri'' and ''E. fernaldi'', which differ in their cnidocyte armoury, sexuality and histology. Species * '' Epiactis adeliana'' Carlgren & Stephenson, 1929 * '' Epiactis arctica'' (Verrill, 1868) * ''Epiactis australiensis'' Carlgren, 1950 * '' Epiactis brucei'' Carlgren, 1939 * '' Epiactis fecunda'' (Verrill, 1899) * '' Epiactis fernaldi'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epiactis Neozealandica
''Epiactis'' is a genus of sea anemones in the family Actiniidae. There are about nineteen recognised species and the type species is ''Epiactis prolifera''. Taxonomy A revision in 1989 determined that the genus ''Cnidopus'' was a synonym of ''Epiactis''. At this time, two new species, ''E. lisbethae'' and ''E. fernaldi'' were described and ''E. ritteri'' was restored to the genus in which it was originally placed. Four species of ''Epiactis'' are known from the Pacific coast of North America, the external brooders ''E. prolifera'' and ''E. lisbethae'' which differ in sexuality and brooding periodicity, and the internal brooders ''E. ritteri'' and ''E. fernaldi'', which differ in their cnidocyte armoury, sexuality and histology. Species * '' Epiactis adeliana'' Carlgren & Stephenson, 1929 * '' Epiactis arctica'' (Verrill, 1868) * ''Epiactis australiensis'' Carlgren, 1950 * '' Epiactis brucei'' Carlgren, 1939 * '' Epiactis fecunda'' (Verrill, 1899) * '' Epiactis fernaldi'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epiactis Marsupialis
''Epiactis'' is a genus of sea anemones in the family Actiniidae. There are about nineteen recognised species and the type species is ''Epiactis prolifera''. Taxonomy A revision in 1989 determined that the genus ''Cnidopus'' was a synonym of ''Epiactis''. At this time, two new species, ''E. lisbethae'' and ''E. fernaldi'' were described and ''E. ritteri'' was restored to the genus in which it was originally placed. Four species of ''Epiactis'' are known from the Pacific coast of North America, the external brooders ''E. prolifera'' and ''E. lisbethae'' which differ in sexuality and brooding periodicity, and the internal brooders ''E. ritteri'' and ''E. fernaldi'', which differ in their cnidocyte armoury, sexuality and histology. Species * '' Epiactis adeliana'' Carlgren & Stephenson, 1929 * '' Epiactis arctica'' (Verrill, 1868) * ''Epiactis australiensis'' Carlgren, 1950 * '' Epiactis brucei'' Carlgren, 1939 * '' Epiactis fecunda'' (Verrill, 1899) * '' Epiactis fernaldi'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
