Trochonema

Trochonema is an extinct genus of early marine snail from the Paleozoic, which lasted almost 215 million years.^[1] It was first described by John William Salter in 1859.^[2] Like many genera in the order Murchisoniina, the relationship between it and other large gastropod clades is uncertain.

Trochonema Temporal range: Darriwilian–Changhsingian PreꞒ Ꞓ O S D C P T J K Pg N
Trochonema sp. from the middle Ordovician of the Galena Limestone of Minnesota
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Murchisoniina
Superfamily:	Trochonematoidea
Family:	Trochonematidae
Genus:	Trochonema Salter, 1859