Meaning of 最近共通祖先 in Japanese

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Definition of 最近共通祖先

きょうつう(kyoutsuu) 【共通】

(adj-na, n, adj-no) commonness; community
私と彼は共通することが多い。
I have much in common with him.
(vs) to be common; to be shared
(n-suf) -wide

さいきん(saikin) 【最近】

(adj-no, n-adv, n-t) most recent; these days; right now; recently; nowadays
最近、彼のうわさを耳にしていない。
We haven't heard of him lately.

そせん(sosen) 【祖先】