Negaprion is a genus of requiem sharks , family Carcharhinidae , containing the two extant species of lemon sharks : the lemon shark ( N. brevirostris ) of the Americas , and the sicklefin lemon shark ( N. acutidens ) of the Indo-Pacific .
There are currently two known living species in this genus : the Lemon shark , and the Sicklefin lemon shark .