- Holotype (A,B) and paratype (C,D) specimens of Omma liassicum dating to the Triassic-Jurassic boundary ~ 200 million years ago
- Holotype specimen of Omma janetae from the Mid-Cretaceous Burmese amber of Myanmar, dating to around 100 million years ago
- Specimen of Omma forte from the Mid-Cretaceous Burmese amber of Myanmar