Medioolithus is an oogenus of fossil egg laid by a paleognath.[1]
| Medioolithus Temporal range:
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|---|---|
Egg fossil classification 
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| Basic shell type: | Ornithoid |
| Morphotype: | Ornithoid-ratite |
| Oofamily: | †Medioolithidae |
| Oogenus: | †Medioolithus Kohring & Hirsch, 1996 |
| Oospecies | |
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Description
editMedioolithus is known several eggshell fragments, and one complete, spherical egg. M. geiseltalensis is very similar to modern ratite eggs, for example those of ostriches, rheas, and cassowaries. At 9 cm (3.5 in) in diameter, however, it is smaller than the eggs of any of these birds, being more similar in size to the egg of a kiwi.[1]