The seymouriamorph tetrapod Ariekanerpeton sigalovi from the Lower Permian of Tadzhikistan. Part II: Postcranial anatomy and relationships

2005 ◽  
Vol 96 (01) ◽  
pp. 71 ◽  
Keyword(s):  
Lower Permian ◽  
Postcranial Anatomy

The seymouriamorph tetrapod Ariekanerpeton sigalovi from the Lower Permian of Tadzhikistan. Part II: Postcranial anatomy and relationships

2005 ◽  
Vol 96 (1) ◽  
pp. 71-93 ◽  
Author(s):  
Jozef Klembara ◽  
Marcello Ruta
Keyword(s):  
Posterior Margin ◽  
Cladistic Analysis ◽  
Sister Group ◽  
Ventral Surface ◽  
Lower Permian ◽  
Postcranial Skeleton ◽  
Ventral Plate ◽  
Anterior Plate ◽  
Posterior Process ◽  
Postcranial Anatomy

ABSTRACTThe postcranial skeleton of Ariekanerpeton sigalovi (Seymouriamorpha: Discosauriscidae; Lower Permian, Tadzhikistan) differs from that of like-sized Discosauriscus specimens in showing: wider interclavicle anterior plate with smaller, rhomboidal sculptured field on its ventral surface not reaching plate posteromedial margins; broader interclavicle plate-stem junction; slightly narrower interclavicle posterior stem; anteroposteriorly narrower clavicle ventral plate with convex posterior margin; shorter, more robust humerus; four phalanges on fourth manus digit (five phalanges in Discosauriscus); ilium more elongate dorsoventrally with anteroposteriorly narrower neck; posterior process of iliac blade oriented distinctly posterodorsally rather than horizontally; more gracile atlantal rib; broadened distal end of second presacral rib. A revised cladistic analysis of the best known seymouriamorph species retrieves Ariekanerpeton either as sister group to both species of Discosauriscus, or to D. austriacus only.

The seymouriamorph tetrapod Utegenia shpinari from the ?Upper Carboniferous–Lower Permian of Kazakhstan. Part II: Postcranial anatomy and relationships

2003 ◽  
Vol 94 (1) ◽  
pp. 75-93 ◽  
Author(s):  
Jozef Klembara ◽  
Marcello Ruta
Keyword(s):  
Sister Taxon ◽  
Lower Permian ◽  
Postcranial Skeleton ◽  
Eastern Asia ◽  
Anterior Portion ◽  
Upper Carboniferous ◽  
Early Juvenile ◽  
Geographical Record ◽  
Anterior Trunk ◽  
Postcranial Anatomy

ABSTRACTThe postcranial skeleton of the seymouriamorph Utegenia shpinari (?Upper Carboniferous–Lower Permian, Kurgalin Formation, Kazakhstan) is redescribed. Features that distinguish it from other Lower Permian seymouriamorphs (Discosauriscus, Ariekanerpeton, Seymouria) are: broad anterior portion of the interclavicle stem, merging indistinctly into the interclavicle plate; absence of a bulge in the anterior half of such a stem; presence of at least 28 presacral vertebrae; gastralia. The poorly ossified limbs of the largest Utegenia specimens are similar in degree of development to those of larval Discosauriscus, but the almost cylindrical, anterior trunk pleurocentra recall the condition of early juvenile Discosauriscus. A phylogeny of the best known seymouriamorphs, using a small but diverse exemplar from other early tetrapod groups, places Utegenia within seymouriamorphs as sister taxon to discosauriscids (Ariekanerpeton plus Discosauriscus). This conclusion affects origin and dispersal scenarios for seymouriamorphs, and supports the hypothesis of a widespread geographical record of Lower Permian taxa spanning across western Euramerica and eastern Asia.

Postcranial anatomy of the ‘microsaur’ Carrolla craddocki from the Lower Permian of Texas

2018 ◽  
Vol 38 (6) ◽  
pp. e1532436 ◽  
Author(s):  
Arjan Mann ◽  
Jennifer C. Olori ◽  
Hillary C. Maddin
Keyword(s):  
Lower Permian ◽  
Postcranial Anatomy

Lithostratigraphy and microfossil biostratigraphy of the Pennsylvanian-lower Permian Horquilla Formation at New Well Peak, Big Hatchet Mountains, New Mexico, USA

Stratigraphy ◽  
2017 ◽  
Vol 14 (1-4) ◽  
pp. 223-246
Author(s):  
Spencer G. Lucas ◽  
Karl Krainer ◽  
James E. Barrick ◽  
Daniel Vachard ◽  
Scott M. Ritter
Keyword(s):  
New Mexico ◽  
Lower Permian

FIRST REPORT OF CHELICHNUS GIGAS IN THE LOWER PERMIAN (WOLFCAMP) QUEANTOWEAP SANDSTONE OF SOUTHERN NEVADA

2016 ◽  
Author(s):  
Stephen M. Rowland ◽  
◽  
Cameron Rickerson ◽  
Summer Matz ◽  
Stephanie Vosburgh ◽  
...  
Keyword(s):  
Lower Permian ◽  
First Report ◽  
Southern Nevada
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