Falls within: Gastropoda. The Loxonematoidea is a superfamily of gastropods with extremely tall, narrow spires. Gastropods ranging in age from the Silurian to the present day (the deep-sea families Provannidae and Abyssochrysidae) have been assigned to the Loxonematoidea by various authors. However, the Silurian and Devonian loxonematoids of the families Loxonematidae and Palaeozygopleuridae differ in… Continue reading Loxonematoidea