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Fossil involucres of Ostrya (Betulaceae) from the early Oligocene of Yunnan and their biogeographic implications
Palaeoworld ( IF 1.7 ) Pub Date : 2019-12-03 , DOI: 10.1016/j.palwor.2019.11.004 Teng-Xiang Wang , Jian Huang , Wen-Na Ding , Cédric Del Rio , Tao Su , Zhe-Kun Zhou
更新日期:2019-12-03
Palaeoworld ( IF 1.7 ) Pub Date : 2019-12-03 , DOI: 10.1016/j.palwor.2019.11.004 Teng-Xiang Wang , Jian Huang , Wen-Na Ding , Cédric Del Rio , Tao Su , Zhe-Kun Zhou
A new fossil occurrence of Ostrya (Betulaceae) is reported based on 14 involucre impressions from the lower Oligocene of Löhe Basin, Yunnan Province, Southwest China. They are characterized by their bladder-like shape with longitudinal veins and perpendicular or branched intercostal veins that form a reticulate venation. The discovery of these fossil involucres represents the earliest unequivocal fossil record of Ostrya in East Asia and the record at the lowest latitude. Its fossil history suggests that the modern distribution pattern of Ostrya might have been established since the early Oligocene, and that this genus has inhabited low altitude areas since then.