Strophomenata - Productida - Productellidae

Alternative combination: Krotovia janus

Full reference: T. K. Huang. 1932. Late Permian Brachiopoda of southwestern China. Palaeontologia Sinica, Series B 9(1):1-138

Belongs to Spinomarginifera according to M. J. Campi et al. 2005

Sister taxa: Spinomarginifera alpha, Spinomarginifera chengyaoyenensis, Spinomarginifera ciliata, Spinomarginifera ciliata, Spinomarginifera concentrica, Spinomarginifera costata, Spinomarginifera giganta, Spinomarginifera grandis, Spinomarginifera helica, Spinomarginifera intercedens, Spinomarginifera iranica, Spinomarginifera jiaozishanensis, Spinomarginifera jisuensis, Spinomarginifera kathwaiensis, Spinomarginifera kueichowensis, Spinomarginifera labaensis, Spinomarginifera lopingensiformis, Spinomarginifera lopingensis, Spinomarginifera plana, Spinomarginifera plena, Spinomarginifera pseudosintanensis, Spinomarginifera pygmaea, Spinomarginifera qaidamensis, Spinomarginifera qiaotingensis, Spinomarginifera semicircridge, Spinomarginifera shizhongensis, Spinomarginifera sichuanensis, Spinomarginifera spatiosa, Spinomarginifera spinosocostata, Spinomarginifera sulcata, Spinomarginifera tuberculatiformis, Spinomarginifera yuduensis

Type specimen: Its type locality is Wumats'ao, Locality TW54, Kueiyang-hsien, which is in a Wuchiapingian marine horizon in China

Ecology: stationary low-level epifaunal suspension feeder

Average measurements (in mm): valve 18.3 x 23.8