TABLE 1. Data Matrix used for phylogenetic analysis. Scoring 0-2 = character states; ? = missing/unknown data.
| Taxon | Brindabellaspis | Romundina | Lunaspis | Eurycaraspis | R. threiplandi |
R. trispinatus | Campbellodus | Ptyctodopsis | Denisonodus | Rhamphodopsis | Ctenurella | Austroptyctodus | Kimbryanodus | Chelyophorus | Materpiscis | Meeksiella |
| Laterial line canals form an X on the nuchal plate | 0 | 0 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Sensory-line canals expressed as grooves or pores | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| > 1 MD plate | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | ? | 1 | 1 | 1 | 1 | 1 | 1 |
| Scales present | ? | 0 | 0 | ? | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 |
| PSGn present no ASGn | ? | 0 | ? | ? | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Gnathal plates lack cusps | ? | 0 | 0 | ? | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Ce meet posterior to Nu | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
| PrO connect mesially | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
| Pi part of anterior skull roof margin | 0 | 0 | 0 | 0 | 1 | 1 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 1 | 1 |
| PSGn have an anterior dorsal process | ? | 0 | ? | ? | 1 | 2 | 2 | 1 | 2 | 1 | 1 | 1 | 1 | 2 | 1 | 1 |
| Tritorial LTp | ? | 1 | ? | ? | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 1 |
| MD high spine | ? | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 |
| Sp present | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ? | 2 | 2 | 0 | 2 | 2 | 2 |
| AL and ADL connect with a simle inverted V-shape | ? | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | ? | 0 | 0 | 0 | 0 | 0 | 0 |
| Elongate AMV | ? | 0 | 0 | 0 | 0 | 0 | 0 | ? | 0 | ? | 1 | 1 | 1 | 0 | 1 | ? |
| Ginglymoid neck joint | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| MD anterior margin shape has a straight or concave | ? | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | ? | 0 | 0 | 0 | 0 | 0 | 0 |
| PrO longer Ce | 1 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 0 |
| Shape of Nu anterior margin is square: | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | 1 | 1 |
| Ce/Pnu/Nu triple point is anterior to the posterior margin of Nu | - | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Size of the postorbital division of M | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 |
| Nu shape | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 1 | 0 |
| Nu groove | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 |
| PO irregular in outline | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | ? | 0 | 0 | 0 | 0 | 0 | 0 |
| Shape of IL anterior border | ? | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 0 |
| M with ventral pr | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 1 |
| LTp ventral pr | ? | 0 | 0 | 0 | 0 | 0 | 0 | ? | 0 | 0 | 1 | 1 | 1 | ? | 0 | 1 |
| dermal pelvic girdle | ? | ? | ? | ? | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
| MD crest | ? | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | ? | 1 | 1 | 1 | ? | 1 | 1 |
| PO fenstra | ? | 1 | ? | ? | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 1 |
| PO > PNu | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 2 | ? | 1 | 1 |
| Extension of the Nu sensory canals to the posterior plate margins | 0 | ? | ? | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 1 |
