Fig. 7 in A new sediment-dwelling pholadid bivalve from Oligocene glaciomarine sediments of King George Island, West Antarctica

Fig. 7. Vertical transverse sections through pholadid bivalve Pholadidea gradzinskii sp. nov. (ZPAL Mo XVIII/12/A–W), preserved in life position within a boring from the Oligocene of King George Island. The numbers refer to distance from the anterior of the shell in milimeters. Abbreviations: ap, apophysis; b, beak; ch, chondrophore; cl, callum; dcle, dorsal extension of the callum; hp, hypoplax; mt, metaplax; r, rasp; sp, siphonoplax; ur, umbonal reflection.