Lobendoceras is a proterocameraceratid with a rather large, moderately expanded, straight shell with a large marginal siphuncle in which sutures have a broad, deep, ventral lobe and septal necks are subholochoanitic to holochoanitic. Lobendoceras has been found in Lower Ordovician marine strata in NW Australia and Siberia. ...
Found on http://en.wikipedia.org/wiki/Lobendoceras
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