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Carapus Acus
''Carapus acus'' is a species of bony fish in the family Carapidae, the pearlfishes, and is native to the Mediterranean Sea and the Atlantic Ocean. It lives as a commensal in association with a sea cucumber, spending the day inside its host and emerging at night to feed. Description ''Carapus acus'' is a laterally-compressed, elongated fish growing to a length of about . The head measures about one eighth of the total length and there are 84 to 92 vertebrae, which gives the fish great flexibility. The continuous dorsal fin and the anal fin run the whole length of the body. There is no caudal fin and the tail ends with a point. The gut loops back and the anus is located just behind the head, in front of the pectoral fins. This fish is translucent, with a number of silvery or reddish-gold iridescent spots on the operculum and the thoracic region. The peritoneum lining the body cavity is an opaque silvery colour. Distribution ''Carapus acus'' is native to the Mediterranean Sea and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Morten Thrane Brünnich
Morten Thrane Brünnich (30 September 1737 – 19 September 1827) was a Denmark, Danish zoologist and mineralogist. Biography Brünnich was born in Copenhagen, the son of a portrait Painting, painter. He studied oriental languages and theology, but soon became interested in natural history. He contributed his observations of insects to Erik Pontoppidan's ''Danske Atlas'' (1763–81). After being put in charge of the natural history collection of Christian Fleischer he became interested in ornithology, and in 1764 he published ''Ornithologia Borealis'', which included the details of many Scandinavian birds, some described for the first time. The publication of ''Ornithologia Borealis'' was aided by his insight in the collection. Brünnich corresponded with many foreign naturalists including Carl Linnaeus, Linnaeus, Peter Simon Pallas and Thomas Pennant. He published his ''Entomologia'' in 1764. He then embarked on a long tour of Europe, spending time studying the fish of the Medi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coelom
The coelom (or celom) is the main body cavity in most animals and is positioned inside the body to surround and contain the digestive tract and other organs. In some animals, it is lined with mesothelium. In other animals, such as molluscs, it remains undifferentiated. In the past, and for practical purposes, coelom characteristics have been used to classify bilaterian animal phyla into informal groups. Etymology The term ''coelom'' derives from the Ancient Greek word (), meaning 'cavity'. Structure Development The coelom is the mesodermally lined cavity between the gut and the outer body wall. During the development of the embryo, coelom formation begins in the gastrulation stage. The developing digestive tube of an embryo forms as a blind pouch called the archenteron. In Protostomes, the coelom forms by a process known as schizocoely. The archenteron initially forms, and the mesoderm splits into two layers: the first attaches to the body wall or ectoderm, forming ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fish Of The Mediterranean Sea
Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of living fish species are ray-finned fish, belonging to the class Actinopterygii, with around 99% of those being teleosts. The earliest organisms that can be classified as fish were soft-bodied chordates that first appeared during the Cambrian period. Although they lacked a true spine, they possessed notochords which allowed them to be more agile than their invertebrate counterparts. Fish would continue to evolve through the Paleozoic era, diversifying into a wide variety of forms. Many fish of the Paleozoic developed external armor that protected them from predators. The first fish with jaws appeared in the Silurian period, after which many (such as sharks) became formidable marine predators rather than just the prey of arthropods. Mos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fish Of The Atlantic Ocean
Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of living fish species are ray-finned fish, belonging to the class Actinopterygii, with around 99% of those being teleosts. The earliest organisms that can be classified as fish were soft-bodied chordates that first appeared during the Cambrian period. Although they lacked a true spine, they possessed notochords which allowed them to be more agile than their invertebrate counterparts. Fish would continue to evolve through the Paleozoic era, diversifying into a wide variety of forms. Many fish of the Paleozoic developed external armor that protected them from predators. The first fish with jaws appeared in the Silurian period, after which many (such as sharks) became formidable marine predators rather than just the prey of arthropods. Most ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carapidae
Pearlfish are marine fish in the ray-finned fish family Carapidae. Pearlfishes inhabit the tropical waters of the Atlantic, Indian, and Pacific Oceans at depths to , along oceanic shelves and slopes. They are slender, elongated fish with no scales, translucent bodies, and dorsal fin rays which are shorter than their anal fin rays. Adults of most species live symbiotically inside various invertebrate hosts, and some live parasitically inside sea cucumbers. The larvae are free living. Characteristics Pearlfishes are slender, distinguished by having dorsal fin rays that are shorter than their anal fin rays. They have translucent, scaleless bodies reminiscent of eels. The largest pearlfish are about in length. They reproduce by laying oval-shaped eggs, about 1 mm in length. Ecology Pearlfishes are unusual in that the adults of most species live inside various types of invertebrates. They typically live inside clams, starfish, or sea squirts, and are simply commensal, not h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metamorphosis
Metamorphosis is a biological process by which an animal physically develops including birth or hatching, involving a conspicuous and relatively abrupt change in the animal's body structure through cell growth and differentiation. Some insects, fish, amphibians, mollusks, crustaceans, cnidarians, echinoderms, and tunicates undergo metamorphosis, which is often accompanied by a change of nutrition source or behavior. Animals can be divided into species that undergo complete metamorphosis (" holometaboly"), incomplete metamorphosis ("hemimetaboly"), or no metamorphosis (" ametaboly"). Scientific usage of the term is technically precise, and it is not applied to general aspects of cell growth, including rapid growth spurts. Generally organisms with a larva stage undergo metamorphosis, and during metamorphosis the organism loses larval characteristics. References to "metamorphosis" in mammals are imprecise and only colloquial, but historically idealist ideas of transformation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Juvenile Fish
Fish go through various life stages between fertilization and adulthood. The life of a fish start as spawned eggs which hatch into immotile larvae. These larval hatchlings are not yet capable of feeding themselves and carry a yolk sac which provides stored nutrition. Before the yolk sac completely disappears, the young fish must mature enough to be able to forage independently. When they have developed to the point where they are capable of feeding by themselves, the fish are called fry. When, in addition, they have developed scales and working fins, the transition to a juvenile fish is complete and it is called a fingerling, so called as they are typically about the size of human fingers. The juvenile stage lasts until the fish is fully grown, sexually mature and interacting with other adult fish. Growth stages Ichthyoplankton ''(planktonic or drifting fish)'' are the eggs and larvae of fish. They are usually found in the sunlit zone of the water column, less than 200 met ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swim Bladder
The swim bladder, gas bladder, fish maw, or air bladder is an internal gas-filled Organ (anatomy), organ that contributes to the ability of many bony fish (but not cartilaginous fish) to control their buoyancy, and thus to stay at their current water depth without having to expend energy in swimming. Also, the Dorsum (biology), dorsal position of the swim bladder means the center of mass is below the centroid, center of volume, allowing it to act as a stabilizing agent. Additionally, the swim bladder functions as a resonator, resonating chamber, to produce or receive sound. The swim bladder is evolutionarily Homology (biology), homologous to the lungs. Charles Darwin remarked upon this in ''On the Origin of Species''.Darwin, Charles (1859''Origin of Species''Page 190, reprinted 1872 by D. Appleton. Darwin reasoned that the lung in air-breathing vertebrates had derived from a more primitive swim bladder. In the embryonic stages, some species, such as Ophioblennius atlanticus, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holothuria Mammata
''Holothuria'' is the type genus of the marine animal family Holothuriidae, part of the class Holothuroidea, commonly known as sea cucumbers. Members of the genus are found in coastal waters in tropical and temperate regions. They are soft bodied, limbless invertebrates that dwell on the ocean floor and are usually detritivore. They resemble a cucumber in form. The genus contains some species that are harvested and sold as food. Species The following species are recognised in the genus ''Holothuria'': * Subgenus ''Acanthotrapeza'' ** '' Holothuria coluber'' ** ''Holothuria kubaryi'' ** ''Holothuria pyxis'' ** ''Holothuria tripilata'' * Subgenus ''Cystipus'' ** ''Holothuria casoae'' ** ''Holothuria cubana'' ** ''Holothuria dura'' ** ''Holothuria hartmeyeri'' ** ''Holothuria inhabilis'' ** ''Holothuria jousseaumei'' ** ''Holothuria mammosa'' ** ''Holothuria occidentalis'' ** ''Holothuria pseudofossor'' ** ''Holothuria rigida'' ** ''Holothuria sucosa'' ** ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holothuria Sanctori
''Holothuria sanctori'' is a species of sea cucumber in the genus ''Holothuria ''Holothuria'' is the type genus of the marine animal family Holothuriidae, part of the class Holothuroidea, commonly known as sea cucumbers. Members of the genus are found in coastal waters in tropical and temperate regions. They are soft bodied ...''. References Holothuriidae Animals described in 1823 {{Holothuroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holothuria Arguinensis
''Holothuria arguinensis'' is a species of sea cucumber in the family Holothuriidae and subgenus ''Roweothuria''. It is found in waters off the northeast Atlantic Ocean and Mediterranean Sea. According to some scholarly research, the species is actively expanding its range and colonizing the south-eastern coast of Spain. The species lives on sandy and seagrass beds A seagrass meadow or seagrass bed is an underwater ecosystem formed by seagrasses. Seagrasses are marine (saltwater) plants found in shallow coastal waters and in the brackish waters of estuaries. Seagrasses are flowering plants with stems and ... in shallow waters and up to depths of 52 meters. It has a rigid and somewhat cylindrical body. A mature specimen can be 35 cm long and weigh 270 grams. Spawning is in summer to autumn. Reproduction success depends on environmental factors, primarily availability of daylight and water temperature – other likely factors include abundance of food, tidal flow and water sal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holothuria Poli
''Holothuria (Roweothuria) poli'', also known as the white spot cucumber, is a species of sea cucumber in the family Holothuridae and the subgenus ''Roweothuria.'' The species was first described by the Italian doctor and naturalist Stefano delle Chiaje in 1824. The species' range has been documented as being in the Mediterranean Sea, Red Sea, and the Bay of Biscay. Description ''Holothuria poli'' is cylindrical and grows to a length of about and a width of . At the anterior end is a crown of retractable tentacles surrounding the mouth; at the posterior end is the cloacal opening. The thick leathery skin contains embedded calcareous sclerites and has blackish spots on a mottled background of brown and grey. The ventral surface is somewhat paler than the dorsal surface, which has numerous low tubercles tipped with white. The longitudinal rows of tube feet exude mucus to which sand and detritus adhere, often concealing the animal's appearance. This species is often confused with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
