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Bizarre Permian ammonoid subfamily Aulacogastrioceratinae from southeast China

  • Zuren Zhou (a1)


Since the 1960s, Chinese researchers have reported a series of bizarre paragastrioceratids associated with the endemic pseudohaloritids and/or kufengoceratins from the Permian Restricted-Sea area of Southeast China. They include Aulacogastrioceras Zhao and Zheng, 1977; “Paragastrioceras” carinatum Chao, 1965 (invalid name, =Chekiangoceras carinatum Ruzhencev, 1974, type species of the genus Chekiangoceras Ruzhencev, 1974); “Paragastrioceras” dongwuliense Zhao and Zheng, 1977; and Nodogastrioceras Ma and Li, 1998 (=Yongpingoceras Ma and Li, 1998; including “Paragastrioceras” dongwuliense). All these taxa share the following characteristic features: 1) an eight-lobed paragastrioceratid suture; 2) a variably shaped, evolute conch, and prominent sculpture with transverse ribs, nodes, and coarse strigae in all ontogenetic stages, suggesting an affinity with the subfamily Paragastrioceratinae; 3) and, by contrast, a conspicuous ventral sinus formed by growth lines and constrictions, indicating a phylogenetic relationship to the subfamily Pseudogastrioceratinae. These endemic Chinese paragastriocertids constitute a separate subfamily, distinct from both Paragastrioceratinae and Pseudogastrioceratinae, for which the subfamily Aulacogastrioceratinae is herein proposed.



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Bizarre Permian ammonoid subfamily Aulacogastrioceratinae from southeast China

  • Zuren Zhou (a1)


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