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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

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