Blakeoceras

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''Blakeoceras'' is a nothoceratid with an exograstric shell consisting of a rapidly expanding phragmocone and a relatively short body chamber, such that the lower or ventral side has a convex profile. Chambers are short, septa are close-spsced. The Siphuncle is concavosiphonate, segments being more or less spool-shaped, with discontinuous actinosiphonate deposits.       
''Blakeoceras'' is a nothoceratid with an exograstric shell consisting of a rapidly expanding phragmocone and a relatively short body chamber, such that the lower or ventral side has a convex profile. Chambers are short, septa are close-spsced. The Siphuncle is concavosiphonate, segments being more or less spool-shaped, with discontinuous actinosiphonate deposits.       
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''Blakeoceras'' is probably derived from the exogastrically cyroconic Upper Silurian ''[[Parimecoceras]]'', which  has a more consistent diameter but also a siphuncle with concave segments by becoming more expansive and may have given rise to ''[[Conostrichoceras]]'' and ''[[Turnoceras]]''.
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''Blakeoceras'' is probably derived from the exogastrically cyroconic Upper Silurian ''[[Perimecoceras]]'', which  has a more consistent diameter but also a siphuncle with concave segments by becoming more expansive and may have given rise to ''[[Conostrichoceras]]'' and ''[[Turnoceras]]''.
''Blakeoceras'', named by Foeste,1926, is known from the Silurian of England and Middle Devonian of central Europe (ex Czechoslovakia).  
''Blakeoceras'', named by Foeste,1926, is known from the Silurian of England and Middle Devonian of central Europe (ex Czechoslovakia).  

Revision as of 12:12, 6 April 2013

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