Fig. 8 in The origins of the cochlea and impedance matching hearing in synapsids

Fig. 8. Relative size of the stapes footplate area of the non-mammalian synapsid Pristerodon mackayi (MB.R.985) from the Late Permian of Biesjespoort, South Africa compared with those of other non-mammalian synapsids. The slope of the stapes for each taxon is added in brackets. The regression line is calculated only for non-fossorial species. Note that the stapes footplate area of Pristerodon is smaller than in fossorial taxa. Used data and material see SOM 1: table S2. Abbreviations: hollow symbols, fossorial species; partially filled symbols, semifossorial; filled symbols, non-fossorial or uncertain species; Arc, Arctognathus nasuta; Bra, Brasilitherium riograndensis; Chi, Chiniquodon theotenicus; Cis, Cistecephalus planiceps; Dic hue, Dicynodon huenei; Dic now, Dicynodontoides nowacki; Dii, Diictodon feliceps; Gla, Glanosuchus sp.; Lys, Lystrosaurus declivis; Mas, Massetognathus pascuali; Nia, Niassodon mfumukasi; Not, Nothosollasia lückhoffi; Pri, Pristerodon sp.; Pla, Placerias gigas; Pro, Procynosuchus delaharpeae; Sta, Stahleckeria potens; Sum, Suminia getmanovi; Thri, Thrinaxodon liorhinus; Yun, Yunnanodon. Modified from Laass (2014).