Plemmyradytes

Plemmyradytes is an extinct genus of dissorophoid temnospondyl from the early Permian (early Asselian stage). It is an amphibamiform from the Eskridge Formation exposures of Nebraska. The type species is Plemmyradytes shintoni.[1] The genus name derives from the Greek plemmyris ('tide' or 'wave') and dytes ('diver'), while the specific name honors John Shinton, a fossil preparator at the Denver Museum of Natural History where all known specimens of this taxon are reposited following collection in the late 20th century.

Plemmyradytes
Temporal range: Lower Permian,
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Amphibia
Order: Temnospondyli
Clade: Amphibamiformes
Genus: Plemmyradytes
Huttenlocker et al., 2007
Type species
Plemmyradytes shintoni
Huttenlocker et al., 2007

Anatomy

Huttenlocker et al. (2007) differentiated Plemmyradytes from other amphibamiforms by: (1) the reduced lateral exposure of the palatine (LEP); (2) a long and narrow supratemporal without a ventral flange; (3) a posteriorly extensive squamosal, long and slightly recurved teeth that decrease in size posteriorly; (4) a shallow dentary with a trough below the tooth row; and (5) smaller teeth on the dentary relative to the maxilla.

Phylogeny

The phylogenetic relationships of Plemmyradytes are variably recovered by different authors. Huttenlocker et al. (2007) found P. shintoni to be the sister taxon of the micropholid Micropholis stowi. Similar results were obtained by Bourget & Anderson (2011) when the character coding was left unchanged.[2] Conversely, updated character coding resulted in P. shintoni being recovered as the sister taxon to Eoscopus. Similarly, Fröbisch & Reisz (2008) recovered P. shintoni as being closer to amphibamids proper (Doleserpeton + Amphibamus) between the Carboniferous amphibamiforms Eoscopus from Kansas and Platyrhinops from Ohio. Subsequent analysis with increased taxon sampling using the same matrix by Maddin et al. (2013) recovered the same results.

Cladogram after Huttenlocker et al. (2007):

Amphibamiformes

Eoscopus

'Tersomius' mosesi

'Tersomius' sp.

Micropholis

Plemmyradytes shintoni

Platyrhinops

Amphibamus

Doleserpeton

Cladogram after Fröbisch and Reisz (2008):[3]

Amphibamiformes

Georgenthalia

Eoscopus

Plemmyradytes

Platyrhinops

Doleserpeton

Gerobatrachus

Amphibamus

Tersomius

Micropholis

Pasawioops

References

  1. Adam K. Huttenlocker, Jason D. Pardo and Bryan J. Small (2007). "Plemmyradytes shintoni, gen. et. sp. nov., an Early Permian Amphibamid (Temnospondyli: Dissorophoidea) from the Eskridge Formation, Nebraska". Journal of Vertebrate Paleontology. 27 (2): 316–328. doi:10.1671/0272-4634(2007)27[316:PSGESN]2.0.CO;2.
  2. Bourget, Hélène; Anderson, Jason S. (2011-02-10). "A new amphibamid (Temnospondyli: Dissorophoidea) from the Early Permian of Texas". Journal of Vertebrate Paleontology. 31 (1): 32–49. doi:10.1080/02724634.2011.539652. ISSN 0272-4634. S2CID 85856972.
  3. Fröbisch, N.B.; Reisz, R.R. (2008). "A new Lower Permian amphibamid (Dissorophoidea, Temnospondyli) from the fissure fill deposits near Richards Spur, Oklahoma". Journal of Vertebrate Paleontology. 28 (4): 1015–1030. doi:10.1671/0272-4634-28.4.1015. S2CID 128698929.
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