Mandaloceratidae

Mandaloceratidae is a family in the nautiloid cephalopod order, Discosorida, from the Middle and Upper (?) Silurian characterized by essentially straight, breviconic shells, most with a faintly exogastric shape produced by the profile of the body chamber. Apertures vary from round to T-shaped, with a long, narrow hyponomic sinus Siphuncles are com
Found on http://en.wikipedia.org/wiki/Mandaloceratidae
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