Strophomenata - Productida - Productellidae
Full reference: J. I. Yanagida and N. Nakornsri. 1999. Permian brachiopods from the Khao Hin Kling area near Phetchabun, north-central Thailand. Bulletin of the Kitakyushu Museum of Natural History 18:105-136
Belongs to Haydenella according to M. Sone et al. 2009
Sister taxa: Haydenella bihemisphaera, Haydenella buravasi, Haydenella carina, Haydenella chilianshaniana, Haydenella deminuta, Haydenella dutkevitchi, Haydenella elongata, Haydenella eminens, Haydenella gefoensis, Haydenella heilongjiangensis, Haydenella khasorensis, Haydenella kiangsiensis, Haydenella libera, Haydenella miaolingensis, Haydenella minuta, Haydenella nanusa, Haydenella paradoxica, Haydenella plicata, Haydenella qinglongensis, Haydenella salinaria, Haydenella subextensa, Haydenella tersa, Haydenella wangqingensis, Haydenella wenganensis, Haydenella wilczeki, Haydenella zhejiangensis, Productus (Haydenella) quaesitus
Type specimen: KMNH IvP 610,056, a valve (ventral valve). Its type locality is Khlong Khon Kaen, Locality O (860810-02~05), which is in a Wordian carbonate limestone in the Tak Fa Formation of Thailand.
Ecology: stationary low-level epifaunal suspension feeder
Average measurements (in mm): shell 13.9 x 20.3, valve 13.4 x 18.5