Late Permian “sphinctozoans” from reefal blocks of the Ba'id area, Oman Mountains

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<jats:p>Late Permian reefal blocks exposed in the Ba'id area of the Eastern Oman Mountains yield a sphinctozoan assemblage that has not been studied previously. The sphinctozoan fauna described here is the first report of such an assemblage from the Arabian Peninsula. Approximately 70 samples were studied with respect to systematic paleontology, as well as frequency of taxa based on presence/absence lists. The sphinctozoans include 14 genera and 25 species. One genus (<jats:italic>Rahbahthalamia</jats:italic>) and five species (<jats:italic>Amblysiphonella omanica, Salzburgia? irregularis, Welteria? hawasinensis, Thaumastocoelia</jats:italic>?<jats:italic>irregularis</jats:italic>, and<jats:italic>Girtyocoelia gracilis</jats:italic>) are described as new.<jats:italic>Amblysiphonella</jats:italic>Steinmann (1882),<jats:italic>Colospongia</jats:italic>Laube (1865), and<jats:italic>Sollasia</jats:italic>Steinmann (1882) have the highest species diversity. On a generic level,<jats:italic>Sollasia, Amblysiphonella</jats:italic>, and<jats:italic>Parauvanella</jats:italic>Senowbari-Daryan and Di Stefano (1988) occur most frequently in the investigated samples. The described fauna exhibits close relationships to sphinctozoan faunas known from the Middle and Late Permian of China and Tunisia.</jats:p>

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