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An extensive faunule of silicified calcareous sponges has been recovered from the Upper Guadalupian Reef Trail Member of the Bell Canyon Formation, from the Patterson Hills, in the southwestern part of the Guadalupe Mountains National Park in western Texas. This is the youngest silicified faunule of Permian sponges known from that area, and possibly the youngest from North America. It includes the hypercalcified ceractinomorph “sphinctozoans” Amblysiphonella sp., Tristratocoelia rhythmicaSenowbari-Daryan and Rigby, 1988, Colospongiella permiana n. gen. and sp., Exaulipora permica (Senowbari-Daryan, 1990), Parauvanella minimaSenowbari-Daryan, 1990, and the “sphinctozoans” Girtyocoelia beedei (Girty, 1909), Sollasia ostiolataSteinmann, 1882, Sollasiella reticulata n. gen. and sp., Ramosothalamiella divaricata n. gen. and sp., and Spica texana n. sp. Also present are Guadalupia zittelianaGirty, 1909, Guadalupia minuta n. sp., Lemonea cylindrica (Girty, 1909), and Lemonea micraRigby, Senowbari-Daryan, and Liu, 1998. Aspiculate calcareous sponges include the “inozoids” Preperonidella rigbyi (Senowbari-Daryan, 1991), ?Djemelia sp., Radiotrabeculopora virga n. sp., Daharella ramosaRigby and Senowbari-Daryan, 1996, Daharella pattersonia n. sp., Daharella crassa n. sp., and Newellospongia perforata n. gen. and sp. The problematic Lercaritubus problematicusFlügel et al., 1990 is tentatively included with the “inozoids.”
The new siliceous protomonaxonid demosponge Monaxoradiata lamina n. gen. and sp., is a moderately common sponge from the member. The new siliceous lithistid demosponges Chiastocolumnia cylindrica n. gen. and sp., Dactylites obconica n. sp., and Dactylites magna n. sp., the large hexactinellid sponge Toomeyospongia gigantiaRigby and Bell, 2005, and the new lyssacinosid Flexuospiculata hexactina n. gen. and sp., along with isolated large hexactines, are associated with these silicified calcareous sponges from the Reef Trail Member. Toomeyospongia gigantiaRigby and Bell, 2005, described earlier, is th