scholarly journals The external gills and ornamentation of skull roof bones of the Lower Permian tetrapodDiscosauriscus (Kuhn 1933) with remarks to its ontogeny

PalZ ◽  
1995 ◽  
Vol 69 (1-2) ◽  
pp. 265-281 ◽  
Author(s):  
Jozef Klembara Bratislava
Keyword(s):  
Lower Permian ◽  
Skull Roof

The seymouriamorph tetrapod Utegenia shpinari from the ?Upper Carboniferous–Lower Permian of Kazakhstan. Part I: Cranial anatomy and ontogeny

2003 ◽  
Vol 94 (1) ◽  
pp. 45-74 ◽  
Author(s):  
Jozef Klembara ◽  
Marcello Ruta
Keyword(s):  
Regression Analysis ◽  
Linear Correlation ◽  
Lower Permian ◽  
Ventral Part ◽  
Upper Carboniferous ◽  
Preliminary Results ◽  
Skull Roof ◽  
Lower Jaw ◽  
Strong Linear Correlation ◽  
Skull Measurements

ABSTRACTThe skull roof, palate and lower jaw of the seymouriamorph Utegenia shpinari (?Upper Carboniferous–Lower Permian; Kurgalin Formation, Kazakhstan) are described in detail, and a new cranial reconstruction is presented. Important features include: skull slightly longer than broad; elongate nasals; deep, elongate posterior cheek region; long, dorsoventrally deep posterior jugal ramus; flat, recurved, blade-like tabular process; denticle-covered anterior ventral part of pterygoid quadrate ramus; transverse pterygoid flange; low radiating ridges with denticle rows on pterygoid and parasphenoid cultriform process; incipient anterior wedge-like process on posterior end of parasphenoid cultriform process; distinct, robust posterolateral processes of posterior plate of parasphenoid. Degree of skull ossification, ornamentation, and absence of ossified quadrate, articular and endocranium suggest that large Utegenia specimens correspond to larval Discosauriscus. In such specimens, dentine infolding extends for almost half of the crown in premaxillary and largest maxillary teeth, as in late larval/metamorphic Discosauriscus. Preliminary results of a regression analysis through some simple skull measurements indicates that, although the preorbital and interorbital regions elongate isometrically relative to the posterior skull table, they do not show a particularly strong linear correlation with the widening of the skull during ontogeny.

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
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