154 



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& Hutchinson, M. N. 1987. The skeleton of a new hornless rhytidosteid 



(Amphibia, Temnospondyli). Alcheringa, Sydney, 11: 291-302. 



Watson, D. M. S. 1919. The structure, evolution and origin of the Amphibia. The 

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1956. The brachyopid labyrinthodonts. Bulletin of the British Museum of Natural 



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Formation of Northern Arizona. University of California Publications in Geological 



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319. 

 Young, G. C. & Laurie, J. R. 1996. An Australian Phanerozoic Timescale. Oxford 



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 von Zittel, K. A. 1888. Handbuch der Palaonlologie Abteilung I. Palaozoologie Band 



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Leipzig. 900 pp. 



APPENDIX 



10. 

 Character List for Table 1 



1. Position of the orbits I. The position of the orbits in relation to 11. 

 the skull margins: close to the skull midline (0); close to the 



skull margin (1). 12. 



2. Position of the orbits II. The position of the orbits in relation to 



the skull table length: approximately in the middle (0); in the 13. 

 anterior half of the skull table ( 1 ). 



3. Otic notch: incised (0); reduced or absent ( 1 ). 14. 



4. Tabular horns: well developed and posteriorly projected (0); 

 reduced to a broad based triangle or absent (1). 15. 



5. Sculpture: 'normal' ridge-grooved pattern without pustules or 

 nodules on the junctions (0); spider-web pattern with nodules 16. 

 or pustules on the junctions (Cosgriff & Zawiskie 1979) ( 1 ). 



6. Lacrimal bone and lacrimal flexure of infraorbital sensory 17. 

 canal: present (0); absent (1). 



7. Posterior margin of the palate embayed (0); almost straight ( 1 ). 



8. Pterygoid otic flange (= oblique ridge): present (0); absent (1). 18. 



9. Pterygoid ascending ramus. In those pterygoids without an 

 otic flange, the ascending ramus is a thin lamina that runs along 



the dorsal surface of the quadrate ramus of the pterygoid and 

 across the corpus: extremely low (1); not extremely low (2). 

 Pterygoid quadrate ramus: evenly curved from the horizontal 

 to the vertical plane throughout its length (0); horizontally 

 oriented proximally and vertically oriented distally so it ap- 

 pears twisted ( 1 ). 



Ventral depressions on the parasphenoid corpus ('pockets' of 

 Watson 1962): present (0); absent (1). 

 Exoccipital-pterygoid suture: not visible in palatal view (0); 

 visible in palatal view ( 1 ). 



Quadrate condyles: well behind the occipital condyles (0); in 

 the same transverse line as the occipital condyles ( 1 ). 

 Cultriform process of the parasphenoid: narrow (0): broad and 

 flat ( 1 ). 



Vomer-palatine contact external to the choana so the maxilla is 

 excluded from its border: absent (0); present (1). 

 Exoccipital condyle articular surface: rounded (0); oval and 

 horizontally elongated (1). 



Palatine tooth row: continuous over the palatine series (0); 

 reduced, so it is only partially present on some of the palatal 

 bones (1); absent (2). 



Shagreen: reduced so it appears on some of the palatal series 

 only, not including the tooth bearing bones (0); on the palatal 

 series including the tooth bearing bones (1). 



Table 1 Taxon-Character state matrix. The matrix includes 12 taxaand 18 characters. Data missing as a result 

 of lack of preservation or because the state is unknown is coded as '?'. Data unknown but as a result of 

 transformation is coded as '-' . The data matrix was subjected to parsimony analysis using PAUP branch-and- 

 bound option. 



CHARACTERS 



TAXA 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



16 



17 



18 



Trimerorhachidae 



































. 



























7 











Lydekkerina 



































- 















1 























Chomatobatrachus 



































- 















1 



















1 



Rhytidosteus 



1 







1 







1 





? 



? 



? 



1 



1 



1 



1 



1 



1 



2 



1 



Peltostega 



1 



? 



1 







7 





1 



2 



1 



1 







1 



1 



7 



1 



? 



? 



Laidleria 



1 







1 







1 





1 



2 



1 



1 







1 



1 



1 



1 



1 







Indobrachyops 



1 







1 













? 



7 



7 



1 



1 







1 



1 







7 



1 



1 



Deltasaurus 



1 







1 







1 





1 



2 



? 



1 



1 



1 



1 



1 



? 



2 



1 



Rewana 



1 



1 



? 



7 





1 





1 



1 



1 



7 



7 



7 



1 



7 



1 



1 



1 



Derwentia 



1 



1 



1 







1 





1 



2 







1 







1 



1 







1 



1 







Arcadia 



1 



1 



1 







1 





1 



1 



1 



? 



7 







? 







1 



1 



1 



Boreopelta 



1 



7 



1 







7 





1 



2 



1 



1 







1 



1 



? 



1 



? 



1 



