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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 Danish zoologist and mineralogist. Biography Brünnich was born in Copenhagen, the son of a portrait 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 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 Mediterranean Sea and publishing h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coelom
The coelom (or celom) is the main body cavity in many 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 () '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
A fish (: fish or fishes) is an aquatic, anamniotic, gill-bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits. Fish can be grouped into the more basal jawless fish and the more common jawed fish, the latter including all living cartilaginous and bony fish, as well as the extinct placoderms and acanthodians. In a break to the long tradition of grouping all fish into a single class (Pisces), modern phylogenetics views fish as a paraphyletic group. Most fish are cold-blooded, their body temperature varying with the surrounding water, though some large active swimmers like white shark and tuna can hold a higher core temperature. Many fish can communicate acoustically with each other, such as during courtship displays. The study of fish is known as ichthyology. The earliest fish appeared during the Cambrian as small filter feeders; they continued to evolve through the Paleozoic, diversifying into many forms. The earliest fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fish Of The Atlantic Ocean
A fish (: fish or fishes) is an aquatic animal, aquatic, Anamniotes, anamniotic, gill-bearing vertebrate animal with swimming fish fin, fins and craniate, a hard skull, but lacking limb (anatomy), limbs with digit (anatomy), digits. Fish can be grouped into the more basal (phylogenetics), basal jawless fish and the more common jawed fish, the latter including all extant taxon, living cartilaginous fish, cartilaginous and bony fish, as well as the extinct placoderms and acanthodians. In a break to the long tradition of grouping all fish into a single Class (biology), class (Pisces), modern phylogenetics views fish as a paraphyletic group. Most fish are ectotherm, cold-blooded, their body temperature varying with the surrounding water, though some large nekton, active swimmers like white shark and tuna can hold a higher core temperature. Many fish can communication in aquatic animals#Acoustic, communicate acoustically with each other, such as during courtship displays. The stud ... [...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, sea cucumbers, starfish, or sea squirts, and are simpl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metamorphosis
Metamorphosis is a biological process by which an animal physically develops including birth transformation or hatching, involving a conspicuous and relatively abrupt change in the animal's body structure through cell growth and differentiation. Some insects, jellyfish, 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"). Generally organisms with a larval stage undergo metamorphosis, and during metamorphosis the organism loses larval characteristics. Etymology The word ''metamorphosis'' derives from Ancient Greek , "transformation, transforming", from ('), "after" and ('), "form". Hormonal control In insects, growth and metamorphosis are controlled by hormones synthesized by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Juvenile Fish
Fish go through various life stages between fertilization and adulthood. The life of 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 m ... [...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 in bony fish that functions to modulate buoyancy, and thus allowing the fish to stay at desired water depth without having to maintain lift (force), lift via swimming, which expends more energy. Also, the Dorsum (biology), dorsal position of the swim bladder means that the expansion of the bladder moves the center of mass downwards, allowing it to act as a stabilizing apparatus. Additionally, the swim bladder functions as a resonating chamber (anatomy), resonating chamber to produce or receive sound. The swim bladder is evolutionarily homology (biology), homologous to the lungs of tetrapods and lungfish, and some ray-finned fish such as bowfins have also evolved similar respiratory functions in their swim bladders. Charles Darwin remarked upon this in ''On the Origin of Species'', and reasoned that the lung in air-breathing vertebrates had derived from a more primitive swim b ... [...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 which dwell on the ocean floor and are usually detritivores. They resemble a cucumber in form. The genus contains some species that are harvested and sold as food. Species The World Register of Marine Species recognizes 163 species in 19 subgenera of ''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 rigid ... [...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 Echinoderms described in 1823 Taxa named by Stefano delle Chiaje {{Holothuroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holothuria Arguinensis
''Holothuria arguinensis'' is a species of sea cucumber in the family Holothuriidae Holothuriidae is a Family (biology), family of sea cucumbers, a type of echinoderm. Description Members of the family Holothuriidae have thick fleshy bodies and several rows of tube feet which are used for moving around and for adhering to the s ... 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 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 sa ... [...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] |
