_--The relationship of _Synaptotylus_ to other coelacanths is obscure at present. [Please select]
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_--Because of the great differences in endocranial structure between the Devonian and Pennsylvanian coelacanths, they are here placed in new subfamilies. [Please select]
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The Diplocercinae include those coelacanths having two large unpaired bones in the endocranium (at present this includes _Diplocercides_ Stensiö, _Nesides_ Stensiö and _Euporosteus_ Jaekel). [Please select]
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