广东茂名盆地古近纪类黄杞属(胡桃科)果化石多样性

Diversity of Palaeocarya (Juglandaceae) fossil fruits from the Paleogene of Maoming Basin,Guangdong

类黄杞属(Palaeocarya Saporta,1873,emend.Manchester,1987)隶属于胡桃科,是一个化石属,典型特征为翅果具有三裂片。该属的化石记录非常丰富,在北半球的新生代地层中被广泛报道。在中国,类黄杞属的化石记录主要见于海南、广西、吉林和云南。本文描述了发现于广东茂名盆地晚始新世和早渐新世地层中的类黄杞属果化石4种,分别为:Palaeocarya yunnanensis San-Ping Xie et Bai-Nian Sun,P.guangxiensis Li et Chen Y.F.,P.gaolingensis Yun-Fa Chen,P.hispida H.H.Meng et Z.K.Zhou。这是迄今广东首次发现类黄杞属大化石,表明在晚始新世时类黄杞属植物即已分布到我国低纬度亚热带地区,并开始了多样性的演化。

As a member of Juglandaceae,the fossil genus Palaeocarya Saporta,1873,emend.Manchester,1987 is well represented in the Cenozoic of the Northern Hemisphere,and it is characterized by a tri-lobed winged fruit.In China,Palaeocarya fossil record is mainly known from Hainan,Guangxi,Jilin and Yunnan.Here,we describe four species of Palaeocarya winged fruits from the upper Eocene and lower Oligocene of the Maoming Basin of Guangdong:Palaeocarya yunnanensis San-Ping Xie et Bai-Nian Sun,P.guangxiensis Li et Chen Y.F.,P.gaolingensis Yun-Fa Chen,and P.hispida H.H.Meng et Z.K.Zhou.This is the first fossil discovery of Palaeocarya in Guangdong,indicating that this genus had been distributed to low latitude subtropical region of China no later than the late Eocene,and had begun to diversify from that time.