Projovellania
Encyclopedia
Projovellania is an extinct nautiloid cephalopod belonging to the oncocerid
family Jovellaniidae
found in mid Silurian sediments in Europe. The shell is a longiconic cyrtocone, like that of Jovellania
or Mixosiphonoceras, except for being compressed rather than depressed.
Oncocerida
The Oncocerida comprise a diverse group of generally small nautiloid cephalopods known from the Middle Ordovician to the Mississippian ,in which the connecting rings are thin and siphuncle segments are variably expanded...
family Jovellaniidae
Jovellaniidae
Jovellaniidae was established as a family within the Oncocerida to include genera characterized by longiconic orthocones and cyrtocones with a subtriangular to depressed cross-section in which the ventral side is typically angular or more acutely rounded than the dorsal side, and in which the...
found in mid Silurian sediments in Europe. The shell is a longiconic cyrtocone, like that of Jovellania
Jovellania
Jovellania is an extinct prehistoric nautiloid genus from the order Oncocerida known from the Lower Devonian of Europe . Nautiloids form a broad group of shelled cephalopods that were once diverse and numerous but are now represented by only a handful of species in two genera.Jovellania was named...
or Mixosiphonoceras, except for being compressed rather than depressed.
References
- Sweet W.C. 1964. Nautiloidea-Oncocerida. Treatise on Invertebrate Paleontology, Part K. Geological Society of America and Univ. of Kansas press. Teichert & Moore, (eds)