1865 in paleontology explained

Newly named archosauromorphs

Newly named dinosaurs

NameStatusAuthorsAgeUnit LocationNotesImages
CoelosaurusPreoccupied.Joseph LeidyLate Cretaceous (early Maastrichtian)Navesink FormationAn ornithomimid. Preoccupied by Owen 1854.
MegadactylusPreoccupiedHitchcockEarly JurassicPortland FormationPreoccupied by Fitzinger, 1843. Later renamed Amphisaurus.
PolacanthusValidSir Richard Owen vide Anonymous.Early Cretaceous (Barremian)Wessex FormationA polacanthine ankylosaur.
TomodonPreoccupied.Joseph LeidyLate Cretaceous (early Maastrichtian)Navesink FormationPreoccupied by Duméril 1853 Later renamed Diplotomodon.

Plesiosaurs

Newly named plesiosaurs

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NameStatusAuthorsAgeUnitLocationNotes
PiratosaurusNomen dubiumLeidyLate Cretaceous (Santonian)A dubious plesiosaur.
Plesiosaurus homalospondylusValidSir Richard OwenEarly Jurassic (Toarcian)Alum shaleA Microcleididae plesiosaur. Type species of Microcleidus Watson, 1909.
Plesiosaurus rostratusValidSir Richard OwenEarly Jurassic (Hettangian-Sinemurian)Charmouth MudstoneA rhomaleosaurid plesiosaur. Type species of Archaeonectrus Novozhilov, 1964.