On Permundaria, A New Genus of the Brachiopod Family Linoproductidae

Abstract

While collecting brachiopod fossils from the Lower Kanokura series of the Kitakami Mountains, the last-named author noticed a Linoproductid shell with strong concentric rugae in addition to numerous fine costellae developing throughout the entire surface of the pedicle valve.rl'his is not the flrst record of the occurrence of this type of brachiopod from that mountains.HAyAsAi<A and MiNATo (19S6) described this peculiar form as Striatijlera?sp. from the same series at a nearby locality to the present occurrence, and already paid great attention to the characteristic pattern of the surface ornamentation.Recently NAi<AMuRA and KATo had an opportunity to study the Permian brachiopods from the Sisophon limestone, Cambodia.Within a large collection of the Sisophon materials two Linoproductid specimens with the same type of unusual sculpture on the surface of the pedicle valve were also turned out.Although Fluctuaria, Uitdaria and Compressoproductus are known at present as the Linoproductid genera with considerably pronounced rugae, both Kital<ami and Sisophon forms do not seem to be generically attributed to three genera above enumerated.Thus, the authors now propose to establish a new genus for them with the generic name of Permundaria.The species here assigned to the newly proposed genus have been hitherto detected from the Middle to Upper Permian strata of South China, Kashmir, besides Japan and Cambodia belonging to the Tethys sea province.In all, five species including the two treated in this paper may be referred to the genus Permztndaria.On Linoprockictid genera with pronottnced rtrgae Recently MuiR-WooD and CoopER (1960, in both valves 1965) defined the family Linopro-