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- Proterovaginoceras (Ancient Greek for "earlier shield horn") is a medium to large sized endocerid (endocone-bearing orthoconic nautiliod) from the Early and Middle Ordovician included in the family Endoceratidae. Proterovaginoceras has a straight shell with a circular cross section, straight sutures, and a ventral to central, nanno-type, siphuncle which fills the entire apical part of the shell. Septal necks are macrochoanitic, up to two camerae (chambers) long; connecting rings, one chamber in length line the inside of the necks. Endocones are long and slender, fill the entire bulbous, nanno-end, of the siphuncle. Proterovaginoceras was named by Reudemann in 1905. Dideroceras Flower 1950 and Chisloceras Gortani 1934 are probably synonymous equivalents. (en)
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- 4700 (xsd:nonNegativeInteger)
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- * P. belemnitiforme
* P. incognitum
* P. rapidum (en)
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- * P. belemnitiforme
** Endoceras belemnitiforme
* P. incognitum
** Dideroceras amplum
** Dideroceras brevispiculum
** Dideroceras kundense
** Dideroceras longispicum
** Dideroceras pribalticum
** Endoceras duplex
** Orthoceras duplex
** Schmidtoceras estonicum
** Schmidtoceras kundense
** Vaginoceras endoseptum (en)
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- Proterovaginoceras belemnitiforme (en)
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- Proterovaginoceras (Ancient Greek for "earlier shield horn") is a medium to large sized endocerid (endocone-bearing orthoconic nautiliod) from the Early and Middle Ordovician included in the family Endoceratidae. Proterovaginoceras was named by Reudemann in 1905. Dideroceras Flower 1950 and Chisloceras Gortani 1934 are probably synonymous equivalents. (en)
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