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Dicyema Shimantoense
''Dicyema shimantoense'' is a parasitic worm of the phylum Dicyemida. It is a vermiform mesozoan parasite that infects the renal appendages of the cephalopod ''Octopus sasakii''. The name is derived from the Shimanto River, which is the longest river in Shikoku, and flows into Tosa Bay Tosa Bay () is a bay north of the line connecting Cape Muroto and Cape Ashizuri in Kochi Prefecture, Japan. Tosa Bay is better fishing grounds in Japan, which is strongly affected by the Kuroshio Current The , also known as the Black or or t .... A study from 2000-06 used 59 specimens obtained from fishermen at Tosa Bay and Kii Strait Japan. '' O. sasakii'' is a cephalopod found mainly in the shallow-water of Southern Japan. Research found that only those of certain sizes and geographical locations can be infected by ''D.shimantoense''. There are many species of dicyemids. Examination of the calotte (the anterior ends of dicyemids ) is required to distinguish them. ''D. shimantoense'' in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parasitic
Parasitism is a close relationship between species, where one organism, the parasite, lives on or inside another organism, the host, causing it some harm, and is adapted structurally to this way of life. The entomologist E. O. Wilson has characterised parasites as "predators that eat prey in units of less than one". Parasites include single-celled protozoans such as the agents of malaria, sleeping sickness, and amoebic dysentery; animals such as hookworms, lice, mosquitoes, and vampire bats; fungi such as honey fungus and the agents of ringworm; and plants such as mistletoe, dodder, and the broomrapes. There are six major parasitic strategies of exploitation of animal hosts, namely parasitic castration, directly transmitted parasitism (by contact), trophicallytransmitted parasitism (by being eaten), vector-transmitted parasitism, parasitoidism, and micropredation. One major axis of classification concerns invasiveness: an endoparasite lives inside the host's body; an e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vermiform
Vermiform (ˈvərməˌfôrm) describes something shaped like a worm. The expression is often employed in biology and anatomy to describe usually soft body parts or animals that are more or less tubular or cylindrical. The word root is Latin, ''vermes'' (worms) and ''formes'' (shaped). A well known example is the vermiform appendix, a small, blind section of the gut in humans and a number of other mammals. A number of soft-bodied animal phyla are typically described as vermiform. The better-known ones are undoubtedly the annelids (earthworm and relatives) and the roundworms (a very common, mainly parasitic group), but a number of less-well-known phyla answer to the same description. Examples range from the minute parasitic mesozoans to the larger-bodied free-living phyla like ribbon worms, peanut worms, and priapulids Priapulida (priapulid worms, from Gr. πριάπος, ''priāpos'' ' Priapus' + Lat. ''-ul-'', diminutive), sometimes referred to as penis worms, is a phylum o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Octopus Sasakii
''Octopus sasakii'' is a species of octopus found only in salt water. This species is a taxon inquirendum. Physical description It is able to change its color. It moves forward by vigorously squeezing water in its cloak and pumping it through the siphon. Diet It is carnivorous with a diet consisting mainly of fish, crabs, lobsters and molluscs, which it catches with the suction cups on its tentacles. Parasitism It is parasitized by '' Dicyema shimantoense'', which infects its renal appendages. Name The specific name honors the Japanese zoologist Madoka Sasaki was a Japanese zoologist, who is known for his work on the cephalopods of Japan, as well as other groups such as salamanders. Sasaki was Professor of Zoology in the Fishery Department of the College of Agriculture at Tohoku Imperial University, Sap ... who died in 1927. References External links ITIS Report: ''Octopus sasakii''— ''the Island Sea of Japan''. Octopodidae Molluscs of Japan Molluscs of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shimanto River
The is a river in western Kōchi Prefecture, Japan. 196 km in length, it has a watershed of 2,270 km². Its name is written with kanji meaning "forty thousand and ten". Since the river is remote from major cities and does not have any dams, it is sometimes referred to as "the last clear stream of Japan". Fishing and production of nori is a thriving industry along the river. It has been named one of the "Three Free-Flowing Rivers in Japan", along with the Nagara River in Gifu Prefecture and the Kakita River (柿田川 ''Kakita-gawa'') in Shizuoka Prefecture. The river also has 47 ''chinkabashi'' (沈下橋 lit. 'sinking bridge'), including those of tributaries. Chinkabashi are low water crossings constructed without parapets in order not to be washed away by floods. The prefecture decided to preserve them as cultural heritage. See also *Yoshino River The Yoshino River (吉野川 ''Yoshino-gawa'') is a river on the island of Shikoku, Japan. It is long and has a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shikoku
is the smallest of the four main islands of Japan. It is long and between wide. It has a population of 3.8 million (, 3.1%). It is south of Honshu and northeast of Kyushu. Shikoku's ancient names include ''Iyo-no-futana-shima'' (), ''Iyo-shima'' (), and ''Futana-shima'' (), and its current name refers to the four former provinces that made up the island: Awa, Tosa, Sanuki, and Iyo. Geography Shikoku Island, comprising Shikoku and its surrounding islets, covers about and consists of four prefectures: Ehime, Kagawa, Kōchi, and Tokushima. Across the Seto Inland Sea lie Wakayama, Osaka, Hyōgo, Okayama, Hiroshima, and Yamaguchi Prefectures on Honshu. To the west lie Ōita and Miyazaki Prefectures on Kyushu. Shikoku is ranked as the 50th largest island by area in the world. Additionally, it is ranked as the 23rd most populated island in the world, with a population density of 193 inhabitants per square kilometre (500/sq mi). Mountains running east and west d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tosa Bay
Tosa Bay () is a bay north of the line connecting Cape Muroto and Cape Ashizuri in Kochi Prefecture, Japan. Tosa Bay is better fishing grounds in Japan, which is strongly affected by the Kuroshio Current The , also known as the Black or or the is a north-flowing, warm ocean current on the west side of the North Pacific Ocean basin. It was named for the deep blue appearance of its waters. Similar to the Gulf Stream in the North Atlantic, the Ku .... References Bays of Japan Landforms of Kōchi Prefecture {{Kochi-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kii Strait
The , also called the Kii Strait, is a strait separating the Japanese island of Shikoku from the Kii Peninsula on the main island of Honshū. This strait connects the Inland Sea with the Pacific Ocean. The name of the strait derives from Kii Province, a former province on the Kii Peninsula. The strait is surrounded by Tokushima Prefecture on Shikoku, Wakayama Prefecture on Honshū, and the southern coast of Awaji Island in Hyōgo Prefecture. It is connected to Osaka Bay via the Kitan Strait and to Harima Nada Harima Sea () is the eastern part of the Seto Inland Sea in Japan. Located on the south side of the southwestern part of Hyogo Prefecture (formerly Harima Province), it is bounded by Awaji Island to the east, Shodoshima to the west, and Shikoku i ... (the eastern part of the Inland Sea) by the Naruto Strait. Western maps from the 19th century also refer to this waterway as the Linschoten Strait.Taylor, Bayard. ''Japan, In Our Day''. New York: Scribner, Armstrong, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cephalopod
A cephalopod is any member of the molluscan class Cephalopoda (Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles (muscular hydrostats) modified from the primitive molluscan foot. Fishers sometimes call cephalopods "inkfish", referring to their common ability to squirt ink. The study of cephalopods is a branch of malacology known as teuthology. Cephalopods became dominant during the Ordovician period, represented by primitive nautiloids. The class now contains two, only distantly related, extant subclasses: Coleoidea, which includes octopuses, squid, and cuttlefish; and Nautiloidea, represented by ''Nautilus'' and ''Allonautilus''. In the Coleoidea, the molluscan shell has been internalized or is absent, whereas in the Nautiloidea, the external shell remains. About 800 living species of cephalopods have been ident ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dicyemida
Dicyemida, also known as Rhombozoa, is a phylum of tiny parasites that live in the renal appendages of cephalopods. Taxonomy Classification is controversial. Traditionally, dicyemids have been grouped with the Orthonectida in the Mesozoa, and, as of 2017, molecular evidence appears to confirm this. However, other molecular phylogenies have placed the dicyemids more closely related to the roundworms. Additional molecular evidence suggests that this phylum is derived from the ''Lophotrochozoa. The phylum is not divided in classes or orders, but contains three families, Conocyemidae, Dicyemidae, and Kantharellidae. Anatomy Adult dicyemids range in length from , and they can be easily viewed through a light microscope. They display eutely, a condition in which each adult individual of a given species has the same number of cells, making cell number a useful identifying character. Dicyemida lack respiratory, circulatory, excretory, digestive, and nervous systems. The organism' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nematogens
Dicyemida, also known as Rhombozoa, is a phylum of tiny parasites that live in the renal appendages of cephalopods. Taxonomy Classification is controversial. Traditionally, dicyemids have been grouped with the Orthonectida in the phylum Mesozoa and, from 2017, molecular evidence appears to confirm this. However, other molecular phylogenies have placed the dicyemids more closely related to the roundworms. Additional molecular evidence suggests that this phylum is derived from the Lophotrochozoa. The phylum (or class if retained within Mesozoa) contains three families, Conocyemidae, Dicyemidae and Kantharellidae, which have sometimes been further grouped into orders. Authors who treat Dicyemida as an order and separate the family Conocyemidae into a different order ( Heterocyemida) prefer 'Rhombozoa' as a more inclusive name for the phylum or class. Anatomy Adult dicyemids range in length from , and they can be easily viewed through a light microscope. They display eute ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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