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- Eubostrychoceras is a genus of helically wound, corkscrew form, heteromorph ammonite which lived during the Upper Cretaceous (M Turonian - Campanian). The genus is included in the ancycleratid family Nostoceratidae. The shell of Eubostrychoceras is a loosely to tightly wound spiral forming a corkscrew with an open, empty umbilicus in the middle. coiling is commonly dextral (right hand). Coils are covered by moderately strong, straight transverse ribs. The aperture, or apertural end, reverses general direction and points upwards or back towards to apex. Sutures are moderately complex. The siphuncle is located mid flank. Eubostrychoceras has a widespread distribution in the Upper Createous and has been found in Antarctica, Japan, Spain, the far east of Russia, Alaska, Vancouver Island, U.S. western interior, Germany, and Madagascar. In 2001 it was reported from Alaska's Matanuska Formation as well. E. japonicum is Turonian, and likely confined to the middle Turonian. Related genera include Anaklinoceras, , Didymoceras, and Nostoceras (en)
- ユーボストリコセラス（学名：Eubostrychoceras）は、後期白亜紀のチューロニアン期からカンパニアン期にかけて生息していた異常巻きアンモナイトの属。北太平洋地域やヨーロッパおよび南極大陸から化石が産出している。バネに似た開いた螺旋状の殻を持つことを特徴とする。 (ja)
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- Fossil of Eubostrychoceras japonicum from Japan. Late Cretaceous. Exhibit in the National Museum of Nature and Science, Tokyo, Japan. (en)
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- * E. indopacificum
* E. japonica
* E. valdelaxum (en)
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- ユーボストリコセラス（学名：Eubostrychoceras）は、後期白亜紀のチューロニアン期からカンパニアン期にかけて生息していた異常巻きアンモナイトの属。北太平洋地域やヨーロッパおよび南極大陸から化石が産出している。バネに似た開いた螺旋状の殻を持つことを特徴とする。 (ja)
- Eubostrychoceras is a genus of helically wound, corkscrew form, heteromorph ammonite which lived during the Upper Cretaceous (M Turonian - Campanian). The genus is included in the ancycleratid family Nostoceratidae. Eubostrychoceras has a widespread distribution in the Upper Createous and has been found in Antarctica, Japan, Spain, the far east of Russia, Alaska, Vancouver Island, U.S. western interior, Germany, and Madagascar. In 2001 it was reported from Alaska's Matanuska Formation as well. E. japonicum is Turonian, and likely confined to the middle Turonian. (en)
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- Eubostrychoceras (en)
- ユーボストリコセラス (ja)
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