1865 in paleontology
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Paleontology or palaeontology is the study of prehistoric life forms on Earth through the examination of plant and animal fossils.[1] This includes the study of body fossils, tracks (ichnites), burrows, cast-off parts, fossilised feces (coprolites), palynomorphs and chemical residues. Because humans have encountered fossils for millennia, paleontology has a long history both before and after becoming formalized as a science. This article records significant discoveries and events related to paleontology that occurred or were published in the year 1865.
Newly named archosauromorphs
Newly named basal archosauromorphs
| Name | Status | Authors | Age | Unit | Location | Notes | |
|---|---|---|---|---|---|---|---|
Newly named dinosaurs
| Name | Novelty | Status | Authors | Age | Unit | Location | Notes | Images |
|---|---|---|---|---|---|---|---|---|
| Astrodon johnstoni | Gen. et sp. nov. | Valid | Leidy | Early Cretaceous (Aptian/Albian boundary) | Arundel Formation | An indeterminate titanosauriform. | | |
| Preoccupied. | Late Cretaceous (early Maastrichtian) | An ornithomimid. Preoccupied by Owen 1854. | ||||||
| Preoccupied | Hitchcock | Preoccupied by Fitzinger, 1843. Later renamed Amphisaurus. | ||||||
| Valid | Sir Richard Owen vide Anonymous. | Early Cretaceous (Barremian) | | |||||
| Preoccupied. | Maastrichtian | Navesink Formation | Preoccupied by Duméril 1853 Later renamed Diplotomodon. |
Plesiosaurs
Newly named plesiosaurs

| Name | Status | Authors | Age | Unit | Location | Notes | |
|---|---|---|---|---|---|---|---|
| Leidy | Late Cretaceous (Santonian) | A dubious plesiosaur. | |||||
| Valid | Early Jurassic (Toarcian) | A Microcleididae plesiosaur. Type species of Microcleidus Watson, 1909. | |||||
| Valid | Sir Richard Owen | Early Jurassic (Hettangian-Sinemurian) | A rhomaleosaurid plesiosaur. Type species of Archaeonectrus Novozhilov, 1964. | ||||

