Libumella cf. athabascensis Green, 1963

Fig. 7A

Material examined

USA • 1 complete carapace; Guadalupe Mountains, West Texas, Williams Ranch Member, Cutoff Formation, Quarry section, sample GM1; Roadian, Middle Permian; MNHN.F. F63401.

Occurrence

Sample GM1, Quarry section, Williams Ranch Member, Cutoff Formation, Guadalupe Mountains, West Texas, USA, Roadian, Middle Permian (this work).

Remarks

The specimen is similar to Libumella athabascensis Green, 1963 from the Mississippian of the Rocky Mountains, Canada (Green 1963; Crasquin 1985) and from the Late Permian of South China (Yuan et al. 2007). Nevertheless, it differs by the presence of a nodule in the dorso-median part of the carapace.