Valhallites is an extinct genus in the nautiloid order Nautilida which includes the living Nautilus

Nautilus

Nautilus is the common name of marine creatures of cephalopod family Nautilidae, the sole extant family of the superfamily Nautilaceae and of its smaller but near equal suborder, Nautilina. It comprises six living species in two genera, the type of which is the genus Nautilus...

found in the tropical western Pacifiic

Pacific Ocean

The Pacific Ocean is the largest of the Earth's oceanic divisions. It extends from the Arctic in the north to the Southern Ocean in the south, bounded by Asia and Australia in the west, and the Americas in the east.At 165.2 million square kilometres in area, this largest division of the World...

. Valhalites belongs to the Koninkioceratidae, a family in the Tainoceratacea, a nautilid superfamily. (Kummel,1964 K427)

Valhalites, which is given a range from the Lower Carboniferous

Carboniferous

The Carboniferous is a geologic period and system that extends from the end of the Devonian Period, about 359.2 ± 2.5 Mya , to the beginning of the Permian Period, about 299.0 ± 0.8 Mya . The name is derived from the Latin word for coal, carbo. Carboniferous means "coal-bearing"...

 (Mississippian) to the Lower Permian

Permian

The PermianThe term "Permian" was introduced into geology in 1841 by Sir Sir R. I. Murchison, president of the Geological Society of London, who identified typical strata in extensive Russian explorations undertaken with Edouard de Verneuil; Murchison asserted in 1841 that he named his "Permian...

, has been found in North America ( Arkansas) and Siberia. Its shell is evolute, rapidly expanding, with a depressed, elliptical whorl section. The venter is broadly rounded, the sides acute. The suture

Suture

Surgical suture is a medical device used to hold body tissues together after an injury or surgery. It generally consists of a needle with an attached length of thread. A number of different shapes, sizes, and thread materials have been developed over its millennia of history.-History:Through many...

 is with shallow ventral, lateral, and dorsal lobes. The shell itself bears short radial ribs, sinuous growth lines, and prominent longitudinal striae. The siphuncle

Siphuncle

The siphuncle is a strand of tissue passing longitudinally through the shell of a cephalopod mollusk. Only cephalopods with chambered shells have siphuncles, such as the extinct ammonites and belemnites, and the living nautiluses, cuttlefish, and Spirula...

is slightly ventral of the center. (ibid)

The nautiloids are a subclass of shelled cephalopods that were once diverse and numerous but are now represented by only a handful of species.