Acanthoclymeniidae is a family of early, primitive,
clymeniid ammonoid cephalopods that lived during the
Late Devonian
The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, wher ...
.
At one time this family was known to contain a single genus, ''Acanthoclymenia'', named by Hyatt in 1900, which is its type.
Acanthoclymeniidae are characterized by their small slightly involute, subdiscoidal, widely umbilicate shells that reach only a few centimeters in diameter. This description applies to the genus ''Acanthoclymenia'' as well.
References
* Miller, Furnish, and Schindewolf (1957) Paleozoic Ammonidea, Treatise on Invertebrate Paleontology Part L, Ammonoidea. Geological Soc of America.
Ammonite families
Taxa described in 1955
{{Clymeniida-stub