Kirkbyella (Berdanella) cf. quadrata Croneis & Gutke, 1939

Fig. 6D

Material examined

USA • 1 right valve; Guadalupe Mountains, West Texas, ‘ McKittrick Canyon’ Member, Bell Canyon Formation, MKCS1 section, sample 4 (GM5); Capitanian, Middle Permian; MNHN.F. F63386 .

Remarks

This specimen could belong to a new species with regard to the ornamentation of the carapace that consists of small ridges on the anterior part and a reticulation on the posterior part. The general shape is similar to that of Kirkbyella (Berdanella) quadrata Croneis & Gutke, 1939 sensu Hoare & Mapes 2000 from the Mississippian of Arkansas (Hoare & Mapes 2000) but in this species the reticulation is organised quite horizontally and here it is more oblique.

Occurrence

Sample 4 (GM5), MKCS1 section, ‘McKittrick Canyon’ Member, Bell Canyon Formation, Guadalupe Mountains, West Texas, USA, Capitanian, Middle Permian (this work).