Pseudactinoceratidae

Pseudactinoceraidae is a family in the nautiloid cephalopod order, Pseudorthocerida, known from the Upper Devonian and Lower Carboniferous (Mississippian). Pseuactinocerids are characterized by elongated, straight and gently curved shells with a subcentral siphuncle composed of broadly expanded segments in the adult in which there are internal dep...
Found on http://en.wikipedia.org/wiki/Pseudactinoceratidae
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