Vertebrata Palasiatica ›› 1995, Vol. 33 ›› Issue (01): 1-16.
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Jin Fan, Tian Yanping, Yang Youshi, Deng Shaoying
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金帆, 田燕平, 杨有世, 邓绍颖
Abstract: During a field work on stratigraphy Mr. Yang Youshi et al., the geologists from •the Regional Geology and Mineral Resources Survey Institute of Hebei Province, discovered some well-preserved fossil sturgeons from the Yixian Formation in Fengning County, northern Hebei Province. These specimens, characterized by an extraordinarily long dorsal fin, represent a new form Yanosteus longidorsalis gen. et SP. nov. of the order Acipenseriformes. Yanosteus is stratigraphically concurrent with two known acipenseriform genera Peipiaosteus Liu et Zhou and Protopsephurus Lu in northern Hebei and western Liaoning. The fishbearing strata of Yixian Formation have long been thought to be Late Jurassic (Liu & Zhou 1965, Lu 1994), but additional evidence suggests an Early Cretaceous age (Li et al. 1994).
摘要: 发现于河北丰宁晚侏罗或早白垩世义县组的燕鲟以其很长的背鳍、长条形的方颧骨、骨化程度较高的中轴骨骼和支鳍骨、鳍条上残留有硬鳞质、无轴上鳍条等,有别于鲟形目所有已知属。燕鲟的吻部骨骼退化为管状小骨片,下鳃盖骨前方明显呈舌状突出,后部裂成锯齿状,尾鳍上硬鳞退化,与列鳍鱼和北票鲟最为相近,暂可归人北票鲟科;北票鲟科的鳃条骨数目少于7根,尾鳍上硬鳞无关节突和凹,可视为鲟亚目(鲟科+匙吻鲟科)的近祖姊妹群。热河群义县组和九佛堂组应为同期异相沉积,且沉积速度很快。
Jin Fan, Tian Yanping, Yang Youshi, Deng Shaoying. AN EARLY FOSSIL STURGEON (ACIPENSERIFORMES, PEIPIAOSTEIDAE) FROM FENGNING OF HEBEI, CHINA. Vertebrata Palasiatica, 1995, 33(01): 1-16.
金帆, 田燕平, 杨有世, 邓绍颖. 1995, 33(01): 1-16, 河北丰宁早期鲟类化石一新属. 古脊椎动物学报.
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