Rayonnoceras

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The heavy phagmocone and siphuncle, weighted by deposits secreted during the life of the animal, surely preclude any swimming mobility, especially in larger adults. While smaller juveniles may have had some "swimming" mobility above the substrate and the ability to move from place to place, to actively hunt and escape predation, larger individuals probably spent most or all of their time in one place on the bottom, waiting in ambush for passing prey, much like modern wobegong or angelfish.  
The heavy phagmocone and siphuncle, weighted by deposits secreted during the life of the animal, surely preclude any swimming mobility, especially in larger adults. While smaller juveniles may have had some "swimming" mobility above the substrate and the ability to move from place to place, to actively hunt and escape predation, larger individuals probably spent most or all of their time in one place on the bottom, waiting in ambush for passing prey, much like modern wobegong or angelfish.  
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No comparison can be made between the heavy carbactinoceratids including ''Rayonnoceras'', tentitive pseudorthocerids, or the morphologically similar actinocerids, and the [[Middle Ordovician|Middle]] and [[Late Ordovician|Upper Ordovician]] [[Endoceratidae]], other than for having, sometimes large, straight shells. Endocerids are simply a very different critter with different and unique internal structures and undoubtedly different abilities and habits.  
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No comparison can be made between the heavy carbactinoceratids including ''Rayonnoceras'', tentitive pseudorthocerids, or the morphologically similar actinocerids, and the [[Middle Ordovician|Middle]] and [[Late Ordovician|Upper Ordovician]] [[Endocerida|Endoceratidae]], other than for having, sometimes large, straight shells. Endocerids are simply a very different critter with different and unique internal structures and undoubtedly different abilities and habits.  
    
    

Revision as of 13:38, 13 December 2009

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