Corymbospongia Rigby & Potter, 1986 from the Sanqushan Formation (Ka-tian, Upper Ordovician) in Yushan, Jiangxi
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Abstract:
Sphinctozoan is one of the less studied macrofossils from the Ordovician. During the Middle and Late Or-dovician, sphinctozoan sponges experienced their first radiation. Sphinctozoan occurrences are known from Alaska andCalifornia of the United States, New South Wales of southeastern Australia, Kazakhstan, Siberia of Russia and north-western China. Here we provide the first report of Corymbospongia from the Sanqushan Formation (Katian, Upper Ordovician) in Yushan, Jiangxi, China. Furthermore, the main characteristics of C. amplia and C. mica are described in this paper, which also reports the diagnostic features of the chambers for the first time. Combined with the results of microfacies, calcareous algae and corals, the two species show different ecological preferences: C. amplia is an active reef builder, which helps to create framework in small patch reefs; C. mica tends to occur in shallow water habitats and is the representative in level-bottom community. Our results provide further evidence for biostratigraphic and palaeo-geographic reconstruction of South China based on the distribution of benthic fauna.
