"endothiodon" was first discovered in the karoo region of beaufort west, south africa. the karoo region is characteristic of siltstones that are fine-to medium- or coarse-grained, dark or greenish grey, and very finely crossbedded. since then several more specimens have been found in african countries including the usili, ruhuhu and lower part of the kawinga formations of tanzania, the basal beds of madumabisa mudstone of zambia, and chiweta beds, malawi. "endothiodon" has been placed in the tropidostoma and/or cistecephalus assemblage zones and dates back to a late permian (tatarian) age. in 1997 the first specimen of "e. mahalanobsi" was found in the kundaram formation in the north-western part of pranhita-godavari valley near golet in adilabad district, andhra pradesh, india. the kundaram formation is characterized by mudstone, sandstone, and ferruginous shale. in addition to africa and india, "endothiodon" is also known from the morro pelado member of rio do rasto formation in the paraná basin, brazil.