Fig. 3. Orientation, measurements, and ridge zones in Stenothecoides rasettii sp. nov. A. Ventral valve, exterior, showing orientation for measurements. B. Ventral valve, interior, showing peripheral and axial ridge zones, and approximated body cavity. Abbreviations: ax, auricular axis; az, axial ridge zone; bc, body cavity; L, valve length; ll, left lobe; lx, lobe axis; pz, peripheral ridge zone; rl, right lobe; vx, valve axis; W, valve width.

Published as part of Johnston, Paul A. & Streng, Michael, 2021, Morphology and relationships of the enigmatic stenothecoid pan-brachiopod Stenothecoides-new data from the middle Cambrian Burgess Shale Formation, pp. 723-751 in Acta Palaeontologica Polonica 66 (4) on page 730, DOI: 10.4202/app.00928.2021, http://zenodo.org/record/12196229