The paraphyletic pelycosaurian-grade synapsids, which can be referred to as simply primitive synapsids, have a predominately North America record, with rare occurrences in Europe. Most recent classifications of the order Synapsida divide it into two sister

Figure 4. Early Permian distributions of the diadectomorph families Limnoscelidae (L), Tseajaiidae (T), and Diadectidae (D). Localities, latitidue and longitude may be found in Appendix 1. *

= highlands J = lowlands


= highlands J = lowlands

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