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. A study from 2000-06 used 59 specimens obtained from fishermen at Tosa Bay and Kii Strait in 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 inserts the conical calottes into intracellular folds of renal appendages.
The body length of D. shimantoense can reach up to 3000μm. Peripheral cells consist of 4 propolars, 5 metapolars, 2-4 parapolars, and 10-12 trunk cells. There are infusoriform embryos of up to 37 cells. There are 2 nuclei in each cell, and 22 peripheral cells.
Life cycleedit
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1. The nematogen is the asexual stage of dicyemids which produce vermiform larvae in the axial cells
2. Nematogens continue to reproduce in the kidneys until the vermiform matures into rhombogens
3. Rhombogens contain hermaphroditic gonads within the axial cell called the infusorigens (gonads which produce gametes of various sizes)
Transmissionedit
This section needs expansion. You can help by adding to it. (July 2011)
The infection of the parasite are found in the kidneys (there is an independent infection of each kidney). In O. sasakii, however, the mode of transmission is currently unknown.
Referencesedit
^Furuya, H (2008). "Three new dicyemids from Octopus sasakii (Mollusca: Cephalopoda: Octopoda)". The Journal of Parasitology. 94 (5): 1071–81. doi:10.1645/GE-1580.1. PMID 18576860.
Furuya, H.; F. G. Hochberg & K. Tsuneki (2001). "Developmental patterns and cell lineages of vermiform embryos in dicyemid mesozoans". Biological Bulletin. 201 (3): 405–416. doi:10.2307/1543618. PMID 11751252.
dicyema, shimantoense, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, july. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Dicyema shimantoense news newspapers books scholar JSTOR July 2011 Learn how and when to remove this template message 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 A study from 2000 06 used 59 specimens obtained from fishermen at Tosa Bay and Kii Strait in 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 Dicyema shimantoenseScientific classificationDomain EukaryotaKingdom AnimaliaPhylum DicyemidaClass RhombozoaFamily DicyemidaeGenus DicyemaSpecies D shimantoenseBinomial nameDicyema shimantoenseFuruya 2008 1 There are many species of dicyemids Examination of the calotte the anterior ends of dicyemids is required to distinguish them D shimantoense inserts the conical calottes into intracellular folds of renal appendages Contents 1 Characteristics 2 Life cycle 3 Transmission 4 ReferencesCharacteristics editThe body length of D shimantoense can reach up to 3000mm Peripheral cells consist of 4 propolars 5 metapolars 2 4 parapolars and 10 12 trunk cells There are infusoriform embryos of up to 37 cells There are 2 nuclei in each cell and 22 peripheral cells Life cycle editThis section is in list format but may read better as prose You can help by converting this section if appropriate Editing help is available July 2011 The Dicyemids have three stages of life 1 The nematogen is the asexual stage of dicyemids which produce vermiform larvae in the axial cells2 Nematogens continue to reproduce in the kidneys until the vermiform matures into rhombogens3 Rhombogens contain hermaphroditic gonads within the axial cell called the infusorigens gonads which produce gametes of various sizes Transmission editThis section needs expansion You can help by adding to it July 2011 The infection of the parasite are found in the kidneys there is an independent infection of each kidney In O sasakii however the mode of transmission is currently unknown References edit Furuya H 2008 Three new dicyemids from Octopus sasakii Mollusca Cephalopoda Octopoda The Journal of Parasitology 94 5 1071 81 doi 10 1645 GE 1580 1 PMID 18576860 Furuya H F G Hochberg amp K Tsuneki 2001 Developmental patterns and cell lineages of vermiform embryos in dicyemid mesozoans Biological Bulletin 201 3 405 416 doi 10 2307 1543618 PMID 11751252 Furuya Hidetaka Tsuneki Kazuhiko 2003 Biology of Dicyemid Mesozoans Zoological Science 20 5 519 32 doi 10 2108 zsj 20 519 PMID 12777824 Retrieved from https en wikipedia org w index php title Dicyema shimantoense amp oldid 1192243458, wikipedia, wiki, book, books, library,
