Extinct orthoceratoid (†Treptoceras transversum)

Superdomain: Neomura

Domain: Eukaryota

(unranked): Opisthokonta

(unranked) Holozoa

(unranked) Filozoa

Kingdom: Animalia

Subkingdom: Eumetazoa

(unranked): Bilateria

(unranked): Protostomia

Superphylum: Lophotrochozoa

Phylum: Mollusca

Subphylum: Conchifera

Class: Cephalopoda

Subclass: †Orthoceratoidea

Order: †Orthocerida

Family: †Proteoceratidae

Genus: †Treptoceras

Species: †T. transversum

Done