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Temporal range: L Cretaceous
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Nautiloidea
Order: Nautilida
Superfamily: Nautilaceae
Family: Cymatoceratidae
Genus: Heminautilus
Spath (1927)

Heminautilus is an extinct nautiloid genus from the nautilacean family Cymatoceratidae that lived during the early Cretaceous (Kummel 1964). Nautiloids are a subclass of shelled cephalopods that were once diverse and numerous but are now represented by only a handful of species.

Heminautilus has a discoidal compressed involute shell with flanks converging on a narrow flattened outer margin, the venter. Whorls are higher than wide. The suture is sinuous with a ventral lobe, subtriangular saddles on the ventral shoulders, broad lateral lobes, and narrow rounded saddles on the umbilical shoulders. The siphuncle is subcentral (Kummel 1964).

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