| Parent | Category | Figures | |
|---|---|---|---|
| 1 | Petricola | carditoides | 60 |
| 2 | Petricola | ponsonbyi | 20 |
| 3 | Petricola | bicolor | 20 |
| 4 | Petricola | lajonkairii | 16 |
| 5 | Petricola | lapicida | 13 |
| 6 | Petricola | aequistriata | 11 |
| 7 | Petricola | californiensis | 8 |
| 8 | Petricola | divergens | 3 |
| 9 | Petricola | lithophaga | 2 |
| 10 | Petricola | substriata | 2 |
| 11 | Petricola | denticulata | 2 |
| 12 | Petricola | patagonica | 1 |
| 13 | Petricola | peruviana | 1 |
| 14 | Petricola | pholadiformis | 1 |
| 15 | Petricola | parallela | 1 |
| 16 | Petricola | typica | 1 |
| 17 | Petricola | cognata | 1 |