Aethoceras

Systematic  Paleontology

Order: Tarphycerida (Nautiloidea, Cephalopoda)

Family: Estonioceratidae

Genus: Aethoceras

Aethoceras, from the lower Ordovician of Western Australia, is perhaps an odd genus for the Estonioceratidae. The shell is trochoidal, wound dextrally (right handed). Coiling is loose, whorls gradually expanded. The siphuncle is ventral, submarginal.

Although included in the Estonioceratidae, Aethoceras might be seen as a very early member of the Trocholiidae