FIGURE 4 in Late Oligocene - Miocene non-lunulate sand dollars of South America: Revision of abertellid taxa and descriptions of two new families, two new genera, and a new species

FIGURE 4. Comparison of oral plate architecture of Iheringiella patagonensis (Desor, 1847) (based on ROM 5433M), Abertella gualichensis Martínez et al., 2005 (based on the holotype, MACN-Pi 4706), Abertella pirabensis (Marchesini Santos, 1958) (reconstruction based on the holotype and only known specimen, DNPM 4493, details of interambulcrum 2 inferred by comparison with interambulacrum 4, and of ambulacrum V by comparison with ambulacrum I), and Placatenella complanata (Brito, 1981) (based on the holotype, MNRJ 5460-I, as well as MNRJ 5536-I, MPEG 886-I, MPEG 2405-I). Food grooves indicated by dotted lines, peristome and periproct in solid black, interambulacra shaded, scale bars 10 mm in length.