Spiriferida
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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.
Spirifer
Videos
Spirifer is a genus of marine brachiopods belonging to the order Spiriferida and family Spiriferidae. Species belonging to the genus lived in the Carboniferous.
Spirifer perlamosus pedunculate valve
S. missouriensis. Early Carboniferous, Radville, Saskatchewan (Canada). At the Royal Tyrrell Museum of Palaeontology.