Dissorophoidea

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Dissorophoidea
Temporal range: Late Carboniferous - Early Triassic, 310–249Ma
Possible descendant taxon Lissamphibia survives to present.
Cacops Field Museum.jpg
Skeleton of Cacops aspidephorus in the Field Museum
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: "Amphibia" (wide sense)
Order: Temnospondyli
Suborder: Euskelia
Superfamily: Dissorophoidea
Bolt, 1969
Clades

Dissorophidae
Amphibamidae
Trematopsidae
Micromelerpetontidae
Branchiosauridae
Melosauridae

Dissorophoideans are a clade of medium-sized, temnospondyl amphibians that appeared during the Late Pennsylvanian in Euramerica, and continued through to the Late Permian and even possibly the Early Triassic of Gondwana (if Micropholis belongs here). They are distinguished by various details of the skull,[1] and many forms seem to have been well adapted for life on land.

It has been suggested that they may be ancestral to the Frogs (Reisz, no date) or even the Lissamphibia as a whole, in which case the latter would be included in this clade.

It is possible that the small Permo-Carboniferous Micromelerpetontidae and the large Late Permian Melosauridae may also belong in this clade.

Phylogeny[edit]

An extensive phylogenetic analysis of dissorophoids conducted in 2012 found that the families Dissorophidae and Trematopidae are more closely related to each other than either is to the family Amphibamidae. Following a 2008 study, the Dissorophidae-Trematopidae clade was called Olsoniformes. Below is the cladogram from the 2012 analysis:[2]

Dissorophoidea
Micromelerpetontidae

Micromelerpeton




Amphibamidae

Platyrhinops



Doleserpeton



Olsoniformes
Trematopidae

Ecolsonia



Fedexia




Tambachia



Anconastes




Phonerpeton



Acheloma





Dissorophidae

Platyhystrix



Aspidosaurus




Conjunctio


Dissorophinae

Dissorophus



Broiliellus texensis



Broiliellus brevis



Broiliellus olsoni



Cacopinae

Brevidorsum




Admiral taxon



Rio Arriba taxon




Cacops morrisi



Cacops aspidephorus




Kamacops



Zygosaurus











References and Reliable Link References[edit]

External links[edit]

References[edit]

  1. ^ (see Laurin & Steyer, 2000, for list of apomorphies)
  2. ^ Schoch, R. R. (2012). "Character distribution and phylogeny of the dissorophid temnospondyls". Fossil Record 15 (2): 121–137. doi:10.1002/mmng.201200010.  edit