Oncoceratidae

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'''Characters''' (from Sweet 1964): Exogastric, ventromyarian brevicones and cyrtocones; siphuncle empty, on ventral side of chamber. Siphuncles suborthochoanitic and cylindrical in early stages of early forms, cyrtochoanitic with expanded segments in later stages and later forms. Connecting rigns thin. Conch usually compressed, few species with circular or depressed section. Actinosiphonate deposits in a few advance forms.
'''Characters''' (from Sweet 1964): Exogastric, ventromyarian brevicones and cyrtocones; siphuncle empty, on ventral side of chamber. Siphuncles suborthochoanitic and cylindrical in early stages of early forms, cyrtochoanitic with expanded segments in later stages and later forms. Connecting rigns thin. Conch usually compressed, few species with circular or depressed section. Actinosiphonate deposits in a few advance forms.
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==Phylogeny/TAxonomy==
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==Phylogeny/Taxonomy==
  [[Oncocerida|<==]]Oncoceratidae [Maelonoceratidae, Melonoceratidae, Ooceratidae, Oocerinidae, Oonoceratidae, Rizoceratidae]
  [[Oncocerida|<==]]Oncoceratidae [Maelonoceratidae, Melonoceratidae, Ooceratidae, Oocerinidae, Oonoceratidae, Rizoceratidae]
     |--+--[[Brevicoceratidae]] S64
     |--+--[[Brevicoceratidae]] S64

Revision as of 12:29, 18 January 2011

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