[5] The structuring is similar to shell layering found in the extinct genera Anabarella and Watsonella, which is thought to suggest that members of the phylum Mollusca developed nacre independently several times.

[5] Due to the size and age of the fossil specimens, Pojetaia are included as part of the Turkish Small shelly fauna.

[2] The description was based on fossils found in early Cambrian Parara Limestone sediments exposed in South Australia.

[2] The species has since been found in Cambrian strata of Greenland, Germany, Transbaikalia, Turkey, Northern China, and Mongolia.

Other researchers, such as Elicki, have noted these differences fall into the accepted range of variation for P. runnegari and as such consider P. ostseensis as a synonym rather than valid.

The genus Oryzoconcha, with the single species O. prisca, was described in 1985 by He and Pei from fossils found in Henan province, China.

The two right and one left disarticulated valves known show a slightly convexity of the hinge, central umbo and lack of a row of muscle scars were used to the genus from Fordilla.

[2] P. sarhroensis was named by Geyer and Streng in 1998 and is now known from a series of 49 fossils from early middle Cambrian sediments exposed in the Anti-Atlas mountains of Morocco.