有關大白鲨及居氏鼬鲨的出現時間
兩者似乎比巨齿鲨也只晚一點出現，在印度喀奇縣發現了兩者的化石，屬早中新世。
在當地的早中新世地層出土的还有丘布特擬噬人鲨，卻不見巨齿鲨的化石，看來丘布特擬噬人鲨也是環球性掠食者，还是當地的霸主
另外當地還有一種名為比氏噬人鲨(Carcharadon bigelowi)的鲨鱼化石，但我懷疑譯名到底有沒有寫錯，因為牙齿實在太像真鲨科
最後當地还有一種8至9米級別的馬來鳄亞科化石
尖吻斜锯牙鲨(Rhizoprionodon acutus)?及大西洋斜锯牙鲨(Rhizoprionodon terraenovae)，始新世都已經出現了
委內瑞拉的鯊魚群 晚中新世 有居氏鼬鯊及公牛鯊
(A) Sharpnose sharkRhizoprionodonsp., (B) Hammerhead sharkSphyrnacf.zygaena, (C) Bull sharkCarcharhinus leucas, (D) “Big tooth”Carcharocles megalodon, (E) Tiger sharkGaleocerdo cuvier, (F) Spotted eagle rayAetobatuscf.narinari, (G) Eagle rayMyliobatissp., (H) GuitarfishRhynchobatussp., (I) SawfishPristissp., (J) Stingray cf.Dasyatis. Artwork by Jorge Gonzalez.
(A) Sharpnose sharkRhizoprionodonsp., (B) Hammerhead sharkSphyrnacf.zygaena, (C) Bull sharkCarcharhinus leucas, (D) “Big tooth”Carcharocles megalodon, (E) Tiger sharkGaleocerdo cuvier, (F) Spotted eagle rayAetobatuscf.narinari, (G) Eagle rayMyliobatissp., (H) GuitarfishRhynchobatussp., (I) SawfishPristissp., (J) Stingray cf.Dasyatis. Artwork by Jorge Gonzalez.
另外，當地發現了一種史前真鯊 Carcharhinus caquetius ，Carcharhinus caquetius大小似乎不比公牛鯊小
(A-J) †Carcharhinus caquetiussp. nov. Holotype: A-C [AMU-CURS-499], paratypes: D-F, I-J [AMU-CURS-477]. (G-H) specimen of †Carcharhinus caquetiussp. nov. [3406-T-2, 3457-T-(1)] from the Angostura Formation, Ecuador. (K-Q)Carcharhinus leucas: Urumaco Fm. [K-L: AMU-CURS-360, M-N, Q: AMU-CURS-368], and Codore Fm. [O-P: AMU-CURS-622]. (R-S)Carcharhinus limbatus: Urumaco Fm. [AMU-CURS-456]. (T-X)Carcharhinus obscurus: Urumaco Fm. [T: AMU-CURS-464, U-V: AMU-CURS-463, W-X: AMU-CURS-466]. View: labial (A, F, H-I, L-M, R, V-W), lingual (C, D, G, J, K, N-Q, S-U, X), profile (B, E). Abbreviations: Fm., Formation.
(A-J) †Carcharhinus caquetiussp. nov. Holotype: A-C [AMU-CURS-499], paratypes: D-F, I-J [AMU-CURS-477]. (G-H) specimen of †Carcharhinus caquetiussp. nov. [3406-T-2, 3457-T-(1)] from the Angostura Formation, Ecuador. (K-Q)Carcharhinus leucas: Urumaco Fm. [K-L: AMU-CURS-360, M-N, Q: AMU-CURS-368], and Codore Fm. [O-P: AMU-CURS-622]. (R-S)Carcharhinus limbatus: Urumaco Fm. [AMU-CURS-456]. (T-X)Carcharhinus obscurus: Urumaco Fm. [T: AMU-CURS-464, U-V: AMU-CURS-463, W-X: AMU-CURS-466]. View: labial (A, F, H-I, L-M, R, V-W), lingual (C, D, G, J, K, N-Q, S-U, X), profile (B, E). Abbreviations: Fm., Formation.