Cyrtospiriferidae
Videos
Cyrtospiriferidae is an extinct family of brachiopods.
Spiriferida
Videos
Spiriferida is an extinct order of brachiopods, known from the Ordovician to the Triassic.
Spirifer striatus, a Carboniferous spiriferide: the top image shows the dorsal view of an articulated shell; the bottom image shows the ventral valve (the dorsal one has been removed) allowing to notice the spiralium (laterally oriented cones forming the skeleton of the lophophore)
A Devonian spiriferide brachiopod from Ohio which served as a host substrate for a colony of hederellids.