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Proterovaginoceras
Extinct genus of nautiloids From Wikipedia, the free encyclopedia
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Proterovaginoceras (Ancient Greek for "earlier shield horn") is a medium to large sized[ambiguous] 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.
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Distribution
Fossils of the genus have been found in:[2]
- Loobu Formation, Estonia
- Abastu Formation, Iran
- Pivorjaiskaja Formation, Lithuania
- Huk and Stein Formations, Norway
- Gillberga, Holen and Komstad Formations, Sweden
- China
References
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External links
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