ammonites
Dyoros semicircularis Afanasjeva 1991 (lamp shell)

Strophomenata - Productida - Rugosochonetidae

Full reference: G. A. Afanasjeva. 1991. Chonetidina descriptions. Permian Invertebrates of Southern Mongolia 95-99

Belongs to Dyoros according to G. A. Afanasjeva 1991

Sister taxa: Dyoros (Dyoros), Dyoros (Lissosia), Dyoros (Tetragonetes), Dyoros acanthopelix, Dyoros esoterica, Dyoros grandis, Dyoros lamellosa, Dyoros pentagonalis

Type specimen: PIN 3385/517. Its type locality is Khovsgol Somon, Unit 2, which is in an Artinskian marine horizon in the Khovsgol Formation of Mongolia.

Ecology: stationary low-level epifaunal suspension feeder