Lepospondyli

Reconstruction of Odonterpeton triangulare by Smokeybjb.


Belongs within: Reptiliomorpha.
Contains: Holospondyli.

The Lepospondyli are a clade of amphibian-grade tetrapods known from the Lower Carboniferous to the Upper Permian, though some authors have suggested that the caecilians represent surviving lepospondyls. The basal members of the clade were the lizard- or salamander-like microsaurs, all small animals with relatively short legs. The Adelospondyli may have been completely limbless, and also possessed a specialised skull roof with the reduction of several bones and heavily ossified gill arches (Ruta et al. 2003).

<==Lepospondyli [Microsauria]
    |  i. s.: Leiocephalikon problematicum T85
    |         Trachystegos megalodon T85
    |         Tuditanidae RCQ03
    |           |--Asaphestera intermedia (Dawson 1894) AR08, RCQ03
    |           `--Tuditanus punctulatus Cope 1874 AR08, RCQ03
    |--Utaherpeton Carroll, Bybee & Tidwell 1991 AR08, RCQ03
    |    `--U. franklini RCQ03
    `--+--Pantylidae RCQ03
       |    |--Pantylus cordatus Cope 1871 PS17, RCQ03
       |    `--+--Stegotretus agyrus Berman, Eberth & Brinkman 1988 AR08, RCQ03
       |       `--Sparodus Fritsch 1876 RCQ03
       |            `--S. validens RCQ03
       `--+--Hapsidopareiontidae RCQ03
          |    |--Saxonerpeton geinitzi (Credner 1890) AR08, RCQ03
          |    `--+--Hapsidopareion lepton Daly 1973 AR08, RCQ03
          |       `--Llistrofus Carroll & Gaskill 1978 PS17, RCQ03
          |            `--L. pricei RCQ03
          `--+--+--Nannaroter mckinzei PS17
             |  `--Ostodolepidae PS17
             |       |--Micraroter erythrogeios Daly 1973 AR08, RCQ03
             |       `--Pelodosotis elongatum Carroll & Gaskill 1978 AR08, RCQ03
             `--+--+--Rhynchonkos AR08 [Goniorhynchidae, Rhynchonkidae PS17]
                |  |    `--R. stovalli (Olson 1970) RCQ03
                |  `--+--Dvellecanus carrolli PS17
                |     `--Aletrimyti gaskillae PS17
                |--+--Huskerpeton englehorni PS17
                |  `--Gymnarthridae PS17
                |       |--Cardiocephalus AR08
                |       |    |--C. peabodyi AR08
                |       |    `--C. sternbergi Broili 1904 RCQ03
                |       |--Euryodus AR08
                |       |    |--E. dalyae AR08
                |       |    `--E. primus Olson 1939 RCQ03
                |       |--Elfridia Thayer 1985 T85
                |       |    `--*E. bulbidens Thayer 1985 T85
                |       `--Hylerpeton dawsoni T85
                `--+--Brachystelechidae PS17
                   |    |--Batropetes fritschia (Geinitz & Deichmüller 1882) AR08, RCQ03
                   |    `--+--Carrolla Langston & Olson 1986 RCQ03
                   |       |    `--C. craddocki RCQ03
                   |       `--Quasicaecilia Carroll 1990 RCQ03
                   |            `--Q. texana RCQ03
                   `--+--+--Microbrachis Fritsch 1876 AR08, D07 [Microbrachidae]
                      |  |    |--M. obtusatum D07
                      |  |    `--M. pelikani Fritsch 1876 RCQ03
                      |  `--+--Hyloplesion [Hyloplesiontidae] RCQ03
                      |     |    `--H. longicostatum Fritsch 1876 RCQ03
                      |     `--Odonterpeton [Odonterpetontidae] RCQ03
                      |          `--O. triangulare Moodie 1909 RCQ03
                      `--+--Holospondyli PS17
                         `--+--Acherontiscus [Acherontiscidae] RCQ03
                            |    `--A. caledoniae Carroll 1969 RCQ03
                            `--Adelospondyli [Adelogyrinidae] RCQ03
                                 |  i. s.: Palaeomolgophis scoticus Brough & Brough 1967 RCQ03
                                 |--Adelospondylus watsoni Carroll 1967 RCQ03
                                 `--+--Adelogyrinus simorhynchus Watson 1929 AR08, RCQ03
                                    `--Dolichopareias disjectus Watson 1929 RCQ03

*Type species of generic name indicated

REFERENCES

[AR08] Anderson, J. S., R. R. Reisz, D. Scott, N. B. Fröbisch & S. S. Sumida. 2008. A stem batrachian from the Early Permian of Texas and the origin of frogs and salamanders. Nature 453: 515–518.

[D07] Dixon, D. 2007. The Complete Illustrated Encyclopedia of Dinosaurs & Prehistoric Creatures. Hermes House: London.

[RCQ03] Ruta, M., M. I. Coates & D. L. J. Quicke. 2003. Early tetrapod relationships revisited. Biological Reviews 78: 251–345.

[T85] Thayer, D. W. 1985. New Pennsylvanian lepospondyl amphibians from the Swisshelm Mountains, Arizona. Journal of Paleontology 59 (3): 684–700.

Last updated: 27 August 2018.

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