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Published online by Cambridge University Press: 20 May 2016
Sponges from Permian beds in West Texas have been known from the early pioneer publication on the Guadalupian fauna by Girty (1908) and the later works by King (1933, 1943), Finks (1960, 1983, 1995), and Rigby et al. (1998). The sponge described here is perhaps the youngest hexactinellid known from the region. It was collected from the Reef Trail Member, the uppermost member of the Upper Guadalupian Bell Canyon Formation, from fault-isolated exposures of the formation in the Patterson Hills (Fig. 1) in the southwestern part of Guadalupe Mountains National Park, south of El Capitan and Guadalupe Peak.