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Biology 680 Major Groups of Vertebrates 2009 - Pelycosauria Dr. Stuart S. Sumida. The Close Relatives of Pelycosaurs. Advanced Amphibian: e.g. Seymouriamorpha Seymouria sanjuanensis. Seymouriamorphs are amphibians: Retain an intertemporal bone (amniotes have lost them). Diadectes.
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Biology 680 Major Groups of Vertebrates 2009 - Pelycosauria Dr. Stuart S. Sumida The Close Relatives of Pelycosaurs
Advanced Amphibian: e.g. Seymouriamorpha Seymouria sanjuanensis
Seymouriamorphs are amphibians: Retain an intertemporal bone (amniotes have lost them)
Orobates pabsti (Diadectomorph)
Diadectomorpha: • No intertemporal bone like other amniotes • Feature of first and second vertebrae • Very terrestrially adapted
Diadectomorpha: • No intertemporal bone like other amniotes • Feature of first and second vertebrae • Very terrestrially adapted
Diadectomorpha: • No intertemporal bone like other amniotes • Feature of first and second vertebrae • Very terrestrially adapted
PARAREPTILIA Includes: • Mesosauria • Bolosauridae • Procolophonia • Paraiesauria
Parieasaurs have lumpy, bumpy skulls Scutosaurus
Development of Large Size in Captorhinidae At least twice.
1 cm New taxon: (Albright, in prep) New, miniature, captorhinid with three rows of dentary and maxillary teeth.
Size Range in Captorhinid Reptiles (All specimens collected by Everett C. Olson.) 1 cm New taxon
Basal Synapsida (“Pelycosauria”): A single opening on side of skull
an – angular art – articular bps – basiparasphenoid ca – anterior coranoid co - coranoid d – dentary ec – ectopterygoid eo - exoccipital f – frontal j – jugal l - lacrimal m - maxilla n – nasal p – parietal pal - palatine pf – postfrontal pm – premaxilla p - postparietal pra - prearticular prf – prefontal pt - pterygoid q – quadrate qj - quadratojugal sa – surangular sm – septomaxilla so – supraoccipital sp - splenial sq – squamosal sta – stapes v - vomer Eothyridid pleycosaurs Oedaleops Eothyris
an – angular art – articular bps – basiparasphenoid ca – anterior coranoid co - coranoid d – dentary ec – ectopterygoid eo - exoccipital f – frontal j – jugal l - lacrimal m - maxilla n – nasal p – parietal pal - palatine pf – postfrontal pm – premaxilla p - postparietal pra - prearticular prf – prefontal pt - pterygoid q – quadrate qj - quadratojugal sa – surangular sm – septomaxilla so – supraoccipital sp - splenial sq – squamosal sta – stapes v - vomer Haptodus
an – angular art – articular bps – basiparasphenoid ca – anterior coranoid co - coranoid d – dentary ec – ectopterygoid eo - exoccipital f – frontal j – jugal l - lacrimal m - maxilla n – nasal p – parietal pal - palatine pf – postfrontal pm – premaxilla p - postparietal pra - prearticular prf – prefontal pt - pterygoid q – quadrate qj - quadratojugal sa – surangular sm – septomaxilla so – supraoccipital sp - splenial sq – squamosal sta – stapes v - vomer Dimetrodon
an – angular art – articular bps – basiparasphenoid ca – anterior coranoid co - coranoid d – dentary ec – ectopterygoid eo - exoccipital f – frontal j – jugal l - lacrimal m - maxilla n – nasal p – parietal pal - palatine pf – postfrontal pm – premaxilla p - postparietal pra - prearticular prf – prefontal pt - pterygoid q – quadrate qj - quadratojugal sa – surangular sm – septomaxilla so – supraoccipital sp - splenial sq – squamosal sta – stapes v - vomer