New species Dalembia jiayinensis (Magnoliopsida) from the Upper Cretaceous Yong'ancun Formation, Heilongjiang, northern China

• New species Dalembia jiayinensis (Magnoliopsida) is described.
• These leaves were found in the Yong'ancun Formation (Santonian), Heilongjiang, China.
• New species represents the youngest, the most south-western occurrence of this genus.

Leaves of Dalembia jiayinensis sp. nov. are reported from the Santonian Yong'ancun Formation exposed along the Heilongjiang (Amur) River in Jiayin County, Northeast China. The leaves are compound, odd-pinnate, consisting of five leaflets. Leaflets are pinnately-lobed, trilobate or unlobed, elliptic, oblong, elliptic-rhomboid or ovate in outline, with blunt or rounded apex and the leaflet base is variable being cuneate, slightly decurrent, truncate or slightly cordate and sometimes asymmetric. Margin is entire or lobed. Lobes are short, simple, decreasing upwards, with wide and rounded sinuses. Apices of the lobes are usually rounded, sometimes notched. Venation is pinnate or palmately-pinnate, craspedodromous or semi-craspedodromous. The new species D. jiayinensis extends both the geographical and stratigraphic ranges of the genus Dalembia. This is the first occurrence of Dalembia in China and the most southern and youngest (Santonian) occurrence of this genus.