Figure 11. Internal views of right valves. A, Cardium costatum (ANSP 54110). Note strong internal expression of radial ribs, absence of impression of adductor muscle scars. Scale bar = 10 mm. B, Plagiocardium granulosum (ANSP 6268). Scale in cm indicated in figure. C, Orthocardium porulosum (ANSP 6266). Scale bar = 10 mm. In B and C, radial ribs expressed internally only at shell margin; adductor muscle scars impressed. Only anterior adductor muscle scar labelled; posterior adductor muscle scar equally well-impressed into shell, but not readily visible in these views due to foreshortening.

Published as part of Schneider, Jay A., 2002, Phylogeny of cardiid bivalves (cockles and giant clams): revision of the Cardiinae and the importance of fossils in explaining disjunct biogeographical distributions, pp. 321-369 in Zoological Journal of the Linnean Society 136 (3) on page 336, DOI: 10.1046/j.1096-3642.2002.00030.x, http://zenodo.org/record/5436390