The Genus Hemichoanella is a small, extinct, orthoconic nautiloid cephalopod from the Lower Ordovician of Western Australia assigned to the orthoceratoid family, Baltoceratidae.
Hemichoanella and the Baltoceratidae are part of the subclass of once diverse and numerous shelled cephalopods known as the Nautiloidea.
Hemichoanella is characterized by its straight, smooth longiconic shell with a circular cross section, large marginal siphuncle and sutures with deep narrow ventral lobes.
Septal necks are hemichoanitic, the source of the name, and reach halfway to the previous septa.
(T&G 1954) Hemichoanella was named by Teichert and Glenister in 1954 (T&G 1954) for specimens found in Emanuel Creek, Kimberley Division, Western Australia.