The Wutinoceratidae is a family of early actinocerids

Actinocerida

The Actinocerida comprise an order of generally straight, medium to large cephalopods that lived during the early and middle Paleozoic, distinguished by a siphuncle composed of expanded segments that extend into the adjacent chambers, in which deposits formed within contain a system of radial...

 defined by Shimazu and Obata in 1938 for actinocerids with thick connecting rings and a complex irregular canal system. Actinocerids are generally straight shelled nautiloid cephalopods with a 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...

 composed of expanded segments, typically with thin connecting rings, in which there are internal deposits penetrated by a system of canals.

The Wutinoceratidae includes three genera, Wutinoceras, Cyrtonybyoceras, and Adamsoceras, known especially from the early Middle Ordovician (Whiterock stage) in northeastern China and North America, but found also from the same age in Australia and northern Europe. Wutinoceras is the earliest and gave rise to Cyrtonybyoceras and Adamsoceras. Cyrtonybyoceras left no descendants but Adamsoceras give rise to the Ormoceratidae. Wutinoceras, further on, gave rise to the Armenoceratidae

Armenoceratidae

Armenoceratidae is a family of early Paleozoic nautiloid cephalopods belonging to the Order Actinocerida.The Armenoceratidae, established by Troedsson is characterized by large, straight or slightly curved shells and large siphuncles with strongly expanded segments between the septa. Septal necks...

 and possibly to the immediate ancestors of Actinoceras

Actinoceras

Actinoceras is the principal and root genus of the Actinoceratidae, a major family in the Actinocerida, that lived during the Middle and Late Ordovician.- Morphology:...

.