Rhynchonellata - Orthida - Plaesiomyidae
Jin et al. (2007) proposed to abolish the genus Pionorthis because its type species, Orthis sola Billings, 1866, belongs to the dalmanelloid genus Mendacella. Billings’ original type specimen has rarely been examined, and the specimen (YPM S-760; see Pl. 13, figs. 14–20) used as O. sola, initially by Schuchert and Cooper (1932) and subsequently in the two editions of the Treatise (Williams and Wright 1965; Williams and Harper 2000), belongs to P. carletona.
Full reference: C. Schuchert and G. A. Cooper. 1932. Brachiopod genera of the suborders Orthoidea and Pentameroidea. Memoirs of the Peabody Museum of Natural History 4(1):1-270
Parent taxon: Dinorthis according to C. Schuchert and G. A. Cooper 1932
See also Jin et al. 2007, Sepkoski 2002 and Williams et al. 2000
Sister taxa: Dinorthis (Retrorsirostra), Dinorthis anticostiensis, Dinorthis atavoides, Dinorthis beiguoshanensis, Dinorthis berwynensis, Dinorthis carleyi, Dinorthis carrickensis, Dinorthis flabellulum, Dinorthis hadra, Dinorthis holdeni, Dinorthis holdenoides, Dinorthis interstriata, Dinorthis meedsi, Dinorthis occidentalis, Dinorthis pectinella, Dinorthis subplicatella, Dinorthis sweeneyi, Dinorthis taukensis, Dinorthis transversa, Dinorthis venusta, Orthis (Dinorthis) meedsi
Subtaxa: none
Ecology: stationary epifaunal suspension feeder
Distribution: there are no occurrences of Dinorthis (Pionorthis) in the database