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Molicola Horridus
''Molicola horridus'' is a species of tapeworm. The adult worm is found in the spiral valve in the lower part of the intestine of the blue shark (''Prionace glauca''). The larvae are found infesting the livers and muscles of ray-finned fishes such as the ocean sunfish (''Mola mola''), and the spot-fin porcupinefish The spot-fin porcupinefish (''Diodon hystrix''), also known as the spotted porcupinefish, black-spotted porcupinefish or simply porcupinefish, is a member of the family Diodontidae. Description The spot-fin porcupinefish is a medium-sized fish ... (''Diodon hystrix''). This tapeworm has been found parasitising sharks from France, the Mediterranean region, Brazil, Canada, India, Japan and New Zealand. References Cestoda Animals described in 1841 {{Cestoda-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diodon Hystrix
Porcupinefishes or balloonfishes, are any of the various species of the genus ''Diodon'', the type genus of Diodontidae. Distinguishing features Fish of the genus ''Diodon'' have: * two-rooted, movable spines (which are derived from modified scales) distributed over their bodies. * beak-like jaws, used to crush their hard-shelled prey (crustaceans and molluscs). They differ from the swelltoads and burrfishes (genera '' Cyclichthys'' and '' Chilomycterus'', respectively), which, in contrast, have fixed, rigid spines. Defense mechanisms * Like true pufferfishes of the related family Tetraodontidae, porcupinefishes can inflate themselves. Once inflated, a porcupinefish's erected spines stand perpendicular to the skin, whereupon they then pose a major difficulty to their predators: a large porcupinefish that is fully inflated can choke a shark to death. According to Charles Darwin in ''The Voyage Of the Beagle'' (1845), Darwin was told by a Doctor Allen of Forres, UK that the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animal
Animals are multicellular, eukaryotic organisms in the Kingdom (biology), biological kingdom Animalia. With few exceptions, animals Heterotroph, consume organic material, Cellular respiration#Aerobic respiration, breathe oxygen, are Motility, able to move, can Sexual reproduction, reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of Cell (biology), cells, the blastula, during Embryogenesis, embryonic development. Over 1.5 million Extant taxon, living animal species have been Species description, described—of which around 1 million are Insecta, insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from to . They have Ecology, complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology. Most living animal species are in Bilateria, a clade whose members have a Symmetry in biology#Bilate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Platyhelminthes
The flatworms, flat worms, Platyhelminthes, or platyhelminths (from the Greek language, Greek πλατύ, ''platy'', meaning "flat" and ἕλμινς (root: ἑλμινθ-), ''helminth-'', meaning "worm") are a Phylum (biology), phylum of relatively simple bilaterian, Segmentation (biology), unsegmented, soft-bodied invertebrates. Unlike other bilaterians, they are acoelomates (having no coelom, body cavity), and have no specialized circulatory system, circulatory and respiratory system, respiratory organ (anatomy), organs, which restricts them to having flattened shapes that allow oxygen and nutrients to pass through their bodies by diffusion. The digestive cavity has only one opening for both ingestion (intake of nutrients) and egestion (removal of undigested wastes); as a result, the food cannot be processed continuously. In traditional medicinal texts, Platyhelminthes are divided into Turbellaria, which are mostly non-parasitic animals such as planarians, and three entirely p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cestoda
Cestoda is a class of parasitic worms in the flatworm phylum (Platyhelminthes). Most of the species—and the best-known—are those in the subclass Eucestoda; they are ribbon-like worms as adults, known as tapeworms. Their bodies consist of many similar units known as proglottids—essentially packages of eggs which are regularly shed into the environment to infect other organisms. Species of the other subclass, Cestodaria, are mainly fish infecting parasites. All cestodes are parasitic; many have complex life histories, including a stage in a definitive (main) host in which the adults grow and reproduce, often for years, and one or two intermediate stages in which the larvae develop in other hosts. Typically the adults live in the digestive tracts of vertebrates, while the larvae often live in the bodies of other animals, either vertebrates or invertebrates. For example, '' Diphyllobothrium'' has at least two intermediate hosts, a crustacean and then one or more freshwater fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eucestoda
Eucestoda, commonly referred to as tapeworms, is the larger of the two Class (biology), subclasses of flatworms in the class Cestoda (the other subclass is Cestodaria). Larvae have six posterior hooks on the scolex (head), in contrast to the ten-hooked Cestodaria. All tapeworms are Parasitism, endoparasites of vertebrates, living in the digestive tract or related ducts. Examples are the pork tapeworm (''Taenia solium'') with a human Host (biology)#Definitive and secondary hosts, definitive host, and pigs as the Host (biology)#Definitive and secondary hosts, secondary host, and ''Moniezia expansa'', the definitive hosts of which are ruminants. Body structure Adult Eucestoda have a white-opaque dorso-ventrally flattened appearance, and are elongated, ranging in length from a few millimeters to 25 meters. Almost all members, except members of the orders Caryophyllidea and Spathebothriidea, are polyzoism, polyzoic with repeated sets of reproductive organs down the body length, and al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trypanorhyncha
''Trypanorhyncha'' is an order of cestodes, a type of flatworm. Some species infect gamefish, such as sciaenids, during the parasitic worm's plerocercoid stage, and are commonly called spaghetti worm because of their appearance, approximating cooked spaghetti. Such species include '' Poecilancistrium caryophyllum'' and '' Pseudogrillotia pleistacantha''. Their scolex, or head region, has 2 to 4 bothria, or sucking grooves that cling onto the host. They have four retractable tentacles. Gallery FIG11 Nybelinia basimegacantha Tentacle.png, Tentacle of '' Nybelinia basimegacantha'', parasitic in the fish '' Neoniphon sammara'' Parasite140092-fig2 FIG 2 Cestoda Trypanorhyncha Callitetrarhynchus gracilis in Scomberomorus commerson.JPG, Plerocerci of '' Callitetrarhynchus gracilis'' in the body cavity of the fish ''Scomberomorus commerson'' Parasite140092-fig2 FIG 3 Cestoda Trypanorhyncha melanized plerocerci in Epinephelus sp.JPG, melanized plerocerci in the bodycavity of a grou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gymnorhynchidae
''Trypanorhyncha'' is an order of cestodes, a type of flatworm. Some species infect gamefish, such as sciaenids, during the parasitic worm's plerocercoid stage, and are commonly called spaghetti worm because of their appearance, approximating cooked spaghetti. Such species include '' Poecilancistrium caryophyllum'' and '' Pseudogrillotia pleistacantha''. Their scolex, or head region, has 2 to 4 bothria, or sucking grooves that cling onto the host. They have four retractable tentacles. Gallery FIG11 Nybelinia basimegacantha Tentacle.png, Tentacle of '' Nybelinia basimegacantha'', parasitic in the fish ''Neoniphon sammara'' Parasite140092-fig2 FIG 2 Cestoda Trypanorhyncha Callitetrarhynchus gracilis in Scomberomorus commerson.JPG, Plerocerci of ''Callitetrarhynchus gracilis'' in the body cavity of the fish '' Scomberomorus commerson'' Parasite140092-fig2 FIG 3 Cestoda Trypanorhyncha melanized plerocerci in Epinephelus sp.JPG, melanized plerocerci in the bodycavity of a grou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Robert-Philippe Dollfus
Robert-Philippe Dollfus (20 July 1887 in Paris, France – 19 February 1976 in Paris, France) was a French zoologist and parasitologist. Stunkard, H.W. 1977. In Memoriam Robert-Philippe Dollfus (1887–1976). Journal of Parasitology 63: 706 & 727. Grabda, E. 1977. Robert Ph. Dollfus (1887–1976) Wspomnienie Pośmiertne. ''Wiadomości Parazytologiczne'' 23: 463–465. Career Robert-Philippe Dollfus was born in Paris on July 20, 1887, in a family of Protestant tradition. His father was Gustave Frédéric Dollfus, famous French geologist and malacologist. Very early on, he attended the laboratories of Alfred Giard and that of Alfred Blanchard. As early as 1912, at the age of 25, he established the notion of metacercaria, a stage of the lifecycle of Digenea. In 1914, he was on an oceanographic mission aboard the Research Vessel "Pourquoi Pas?" under the orders of Jean-Baptiste Charcot. During the Second World War, he was a stretcher bearer and auxiliary doctor. Between the wars, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cestoda
Cestoda is a class of parasitic worms in the flatworm phylum (Platyhelminthes). Most of the species—and the best-known—are those in the subclass Eucestoda; they are ribbon-like worms as adults, known as tapeworms. Their bodies consist of many similar units known as proglottids—essentially packages of eggs which are regularly shed into the environment to infect other organisms. Species of the other subclass, Cestodaria, are mainly fish infecting parasites. All cestodes are parasitic; many have complex life histories, including a stage in a definitive (main) host in which the adults grow and reproduce, often for years, and one or two intermediate stages in which the larvae develop in other hosts. Typically the adults live in the digestive tracts of vertebrates, while the larvae often live in the bodies of other animals, either vertebrates or invertebrates. For example, '' Diphyllobothrium'' has at least two intermediate hosts, a crustacean and then one or more freshwater fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spiral Valve
A spiral valve or scroll valve is the corkscrew-shaped lower portion of the intestine of some sharks, Acipenseriformes (sturgeon and paddlefish), rays, skates, bichirs, Lepisosteiformes (gars), and lungfishes. A modification of the ileum, the spiral valve is internally twisted or coiled to increase the surface area of the intestine which increases nutrient absorption.Campbell Reece, ''Biology'', 9th edition, p. 752 Description The intestines of a shark are much shorter than those of mammals. Sharks have compensated for this problem by having a spiral valve, or a scroll valve, inside the intestine to increase the absorbent surface of the intestine. By keeping digestible material in the ileum for an extended period maximum nutrient absorption is ensured. For this reason, many sharks and related fish feed very infrequently. The food passes into the comparatively short colon of the shark almost fully digested, and then out the cloaca and vent. A consequence of the spiral valve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blue Shark
The blue shark (''Prionace glauca''), also known as the great blue shark, is a species of requiem shark, in the family Carcharhinidae, which inhabits deep waters in the world's temperate and tropical oceans. Averaging around and preferring cooler waters, the blue shark migrates long distances, such as from New England to South America. It is listed as Near Threatened by the IUCN. Although generally lethargic, they can move very quickly. Blue sharks are viviparous and are noted for large litters of 25 to over 100 pups. They feed primarily on small fish and squid, although they can take larger prey. Maximum lifespan is still unknown, but it is believed that they can live up to 20 years. Anatomy and appearance Blue sharks are light-bodied with long pectoral fins. Like many other sharks, blue sharks are countershaded: the top of the body is deep blue, lighter on the sides, and the underside is white. The male blue shark commonly grows to at maturity, whereas the larger females ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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