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Glenisteroceras : ウィキペディア英語版 | Glenisteroceras
''Glenesteroceras'', which is of questionable validity, is based on a single specimen from the Lower Ordovician of New York state, described by Rousseau Flower, 1957. ''Glenestoceras'' is described as being a weakly annulate orthocone with a circular cross section and large central siphuncle with slightly divergent necks, thick connecting rings, and expanded segments. Description is based on an incomplete immature phragmocone with a 5mm cross section. ==References== * Walter A Sweet, 1964. Nautiloidea - Orthocerida, ''Treatise on Invertebrate Paleontology'', Part K, ''incl'' Nautiloidea. Geological Society of America and University of Kansas Press.
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