Koninckioceratidae is a family of
nautilid genera, typically with more or less
evolute
In the differential geometry of curves, the evolute of a curve is the locus (mathematics), locus of all its Center of curvature, centers of curvature. That is to say that when the center of curvature of each point on a curve is drawn, the result ...
shells with depressed whorl sections, that are combined as a family within the
Tainocerataceae. As perceived, the Koninckioceratidae contains 11 genera and lasted from the Early Mississippian to about the end of the Permian.
Koninckioceratidae was established by Hyatt in Zittel, 1900, to include ''Edaphoceras'', ''Endolobus'', ''Foordiceras'', ''Lophoceras'', and ''Temnocheilus'', with ''Knightoceras'', ''Milkoninckioceras'', ''Subvestinautilus'', and ''Valhallites'' since added by Kummel (1964)
The Konnckioceratidae is essentially a Mississippian (L Carb) family with only four of the nine genera found in Mississippian age rocks extending as far as the Permian and one reaching only into the Pennsylvanian (U Carb). Only two genera are known exclusively from post Mississippian formations, ''Knightoceras'' from Middle Pennsylvania and Foordiceras from Permian. This is opposite from the development of the
Tainoceratidae
Tainoceratidae is a family of late Paleozoic and Triassic nautiloids that are a part of the order Nautilida, characterized by large, generally evolute shells with quadrate to rectangular whorl sections. Shells may bear ribs or nodes, or both.
...
in which the number of genera expands in the Permian and Triassic from a more feeble beginning rather than diminishes.
Genera, listed by earliest known age, are:
*''
Edaphoceras'' Miss. N Am.
*''
Lophoceras'' Miss. Eu
*''
Subvestinautilus'' Miss. Eu
*''
Tylodiscoceras'' Dev.-Miss. N Am.
*''
Planetoceras'' Miss.-Penn. N Am, Eu
*''
Endolobus
''Endolobus'' is an extinct genus from the nautiloid order, Nautilida. Nautiloids are a subclass of shelled cephalopods that were once diverse and numerous but are now represented by only a handful of species, including ''Nautilus''. ''Endolubu ...
'' Miss.-Perm. N Am, Eu, Asia
*''
Milkoninckioceras'' Miss.-Perm. N Am, Eu
*''
Temnocheilus'' Miss.-Perm. N Am, Eu
*''
Valhallites'' Miss.-Perm. N Am, Asia
*''
Knightoceras'' Penn. N Am, Eu
*''
Foordiceras'' Perm. Eu, Asia
References
*Bernhard Kummel, 1964. Nautiloidea-Nautilida.
Treatise on Invertebrate Paleontology
The ''Treatise on Invertebrate Paleontology,'' published from 1953–2007 by the Geological Society of America and the University of Kansas, then 2009–present by the University of Kansas Paleontological Institute, is a definitive multi-authore ...
, Part K. Geological Soc. of America and University of Kansas press. Teichert and Moore (eds)
Konickioceratidae-Paleodb
{{Taxonbar, from=Q6429377
Nautiloids
Devonian first appearances
Permian extinctions