''Jeletzkya douglassae'' is a fossil

coleoid Subclass Coleoidea, or Dibranchiata, is the grouping of cephalopods containing all the various taxa popularly thought of as "soft-bodied" or "shell-less" (i.e., octopuses, squid and cuttlefish). Unlike its extant sister group, Nautiloidea, whose ...

from the early Pennsylvanian Mazon Creek lagerstätten and represents the earliest known

crown-group In phylogenetics, the crown group or crown assemblage is a collection of species composed of the living representatives of the collection, the most recent common ancestor of the collection, and all descendants of the most recent common ancestor. ...

squid. Non-mineralized anatomy is preserved and comprises ten hooked

tentacles In zoology, a tentacle is a flexible, mobile, and elongated organ present in some species of animals, most of them invertebrates. In animal anatomy, tentacles usually occur in one or more pairs. Anatomically, the tentacles of animals work mainl ...

and a radula. It is too poorly understood for assignment to any particular cephalopod taxon.

References

Carboniferous cephalopods Cephalopod genera Carboniferous animals of North America {{Carboniferous-animal-stub