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; von der heyde, p.; kerlick, g.d.; nester, j.m.
; von der heyde, p.; kerlick, g.d.; nester, j.m.

several "pelecanus" species have been described from fossil material, including:* "pelecanus cadimurka", rich & van tets, 1981 (late pliocene, south australia)* "pelecanus cautleyi", davies, 1880 (early pliocene, siwalik hills, india)* "pelecanus fraasi", lydekker, 1891 (middle miocene, bavaria, germany)* "pelecanus gracilis", milne-edwards, 1863 (early miocene, france) (see: "miopelecanus")* "pelecanus halieus", wetmore, 1933 (late pliocene, idaho, us)* "pelecanus intermedius", fraas, 1870 (middle miocene, bavaria, germany) (transferred to "miopelecanus" by cheneval in 1984)* "pelecanus odessanus", widhalm, 1886 (late miocene, near odessa, ukraine)* "pelecanus schreiberi", olson, 1999 (early pliocene, north carolina, us)* "pelecanus sivalensis", davies, 1880 (early pliocene, siwalik hills, india)* "pelecanus tirarensis", miller, 1966 (late oligocene to middle miocene, south australia)===living species===the eight living pelican species were traditionally divided into two groups, one containing four ground-nesters with mainly white adult plumage (australian, dalmatian, great white, and american white pelicans), and one containing four grey or brown plumaged species which nest preferentially either in trees (pink-backed, spot-billed and brown pelicans), or on sea rocks (peruvian pelican).
fosil kalıntılarından çeşitli "pelecanus" türleri tanımlanmıştır:* "pelecanus cadimurka", rich & van tets, 1981 (pliyosen sonu, güney avustralya)* "pelecanus cautleyi", davies, 1880 (pliyosen başı, siwalik hills, hindistan)* "pelecanus fraasi", lydekker, 1891 (miyosen'in ortası, bavyera, almanya)* "pelecanus gracilis", milne-edwards, 1863 (miyosen başı, fransa)* "pelecanus halieus", wetmore, 1933 (pliyosen sonu, idaho, abd)* "pelecanus intermedius", fraas, 1870 (miyosen'in ortası, bavyera, almanya)* "pelecanus odessanus", widhalm, 1886 (miyosen'in sonu, odessa yakınında, ukrayna)* "pelecanus schreiberi", olson, 1999 (pliyosen'in başı, kuzey carolina, abd)* "pelecanus sivalensis", davies, 1880 (pliyosen'in başı, siwalik hills, hindistan)* "pelecanus tirarensis", miller, 1966 (oligosen'in sonu ile miyosen'in ortası, güney avustralya)=== yaşayan türler ===yaşayan sekiz pelikan türü iki gruba ayrılabilir: yerde yuvalanan ve asıl olarak erişkinleri beyaz tüylü olan avustralya pelikanı, tepeli pelikan, ak pelikan ve amerika ak pelikanı.