''Discoserra'' is a prehistoric ray-finned fish from the

Mississippian Mississippian may refer to: * Mississippian (geology), a subperiod of the Carboniferous period in the geologic timescale, roughly 360 to 325 million years ago *Mississippian culture, a culture of Native American mound-builders from 900 to 1500 AD ...

of Montana, a member of the

Guildayichthyiformes Guildayichthyidae is a prehistoric family of marine fish from the Mississippian Bear Gulch Limestone of Montana. It is the only family in the order Guildayichthyiformes. Guildayichthyids possess an uncommon mixture of primitive and modern charac ...

, with a round body and a skull possessing primitive and modern traits. ''Discoserra'' is about 60 mm long. In 2006, ''Discoserra'' was hypothesized to be a

stem Stem or STEM may refer to: Plant structures * Plant stem, a plant's aboveground axis, made of vascular tissue, off which leaves and flowers hang * Stipe (botany), a stalk to support some other structure * Stipe (mycology), the stem of a mushro ...

neopterygian, although it has alternatively been placed in Cladistia along with other Guildayichthyiformes.

References

Mississippian fish of North America Guildayichthyiformes {{paleo-rayfinned-fish-stub