Omnisaura

Egg type

Protoceratopsidovum

Mikhailov 1994

Protoceratopsidovum is an egg type: the name is for the fossil eggs themselves. The animal that laid them is not known for certain. Its eggs are found in rocks 83.6–72.2 million years old in Mongolia.

Confidence labels
How sure are we?0 high9 medium0 lowHow we rate confidence

Confidence labels are switched off. Facts with low confidence, or where sources disagree, still carry a small dot: tap it for the reason.

At a glance

Data as of 11 October 2026
83.6–72.2 Ma
Triassic
Jurassic
Cretaceous
252 million years ago20114366

Solid: the ages of its dated fossils, 83.6–72.2 million years ago (Omnisaura's calculation). Pale: the published range, 100.5–72.2 million years ago, which also counts records Omnisaura leaves out.

The last non-bird dinosaurs died out 66 million years ago. That's as far from us as the end of this bar.

Named by
Mikhailov 1994
mediummedium: Only PBDB gives this; nothing contradicts it.
Sources

Given by: Paleobiology Database. How it was chosen: PBDB leads.

Described in
K. E. Mikhailov (1994). Theropod and protoceratopsian dinosaur eggs from the Cretaceous of Mongolia and Kazakhstan. Paleontological Journal 28: 101–120.
mediummedium: Only PBDB gives this; its author and year match the naming authority (Mikhailov 1994).
Sources

Given by: Paleobiology Database. The publication the Paleobiology Database gives as the authority for this genus name, usually the one that first named and described it.

Dated to
Cenomanian to Campanian, 100.5–72.2 million years ago
mediummedium: Only PBDB gives this; nothing contradicts it.
Omnisaura calculation83.6–72.2 million years ago, from its dated fossil records
mediummedium: Omnisaura's calculation from 14 confirmed PBDB records.
Sources

Given by: Paleobiology Database. How it was chosen: PBDB leads.

Found in
Mongolia
mediummedium: Only PBDB records it (14 records).
Sources

Given by: Paleobiology Database. How it was chosen: Union of all sources (ISO 3166).

Rock formations
Baruungoyot
mediummedium: Only PBDB records it (7 records).
Djadokhta
mediummedium: Only PBDB records it (7 records).
Sources

Given by: Paleobiology Database. How it was chosen: Canonical names, automatic and editor-approved matches applied.

Egg family
Prismatoolithidae
mediummedium: Only PBDB gives this; nothing contradicts it.
Sources

Given by: Paleobiology Database. How it was chosen: PBDB leads.

Parent group
Prismatoolithidae
mediummedium: Only PBDB gives this; nothing contradicts it.
Sources

Given by: Paleobiology Database. How it was chosen: PBDB leads.

Species named in its records
Protoceratopsidovum fluxuosum, Protoceratopsidovum minimum, Protoceratopsidovum sincerum
Sources

Given by: Paleobiology Database (the species its fossil records are identified as).

Known from
Eggs
Sources

Given by: Paleobiology Database (what the name was based on).

Laid by
Not known for certain. Eggs rarely show which animal laid them.
Sources: Omnisaura editorial (Omnisaura editorial content (© Future Sailors, all rights reserved)), Paleobiology Database (CC BY 4.0), Natural History Museum Data Portal (CC0 1.0), Wikidata (CC0 1.0)Confidence levels and gaps are Omnisaura's own assessment.

Gaps are answers

What isn't known yet

  • The animal that laid them: not known for certain, as for most egg types.
  • Type species: no source we use gives it yet.
  • Order: no source we use gives it yet.
  • Common names: no source we use gives it yet.
  • What it was named after: no source we use gives it yet.
  • Held back: 2 fossil records left out: identified only tentatively (for example "cf.", "?" or the name in quotation marks).
  • Resting on one source: 4 facts come from a single source with nothing against them (rated medium): authority (PBDB); parent group (PBDB); family (PBDB); age (headline) (PBDB).

Size and appearance aren't covered yet, and diet and way of life only as PBDB infers them for the wider group. Omnisaura leaves the rest out rather than guess.

Where sources disagree

None open. Where our sources overlap, they agree on everything shown here.

Did it meet…?

?

Same time, different places. Their fossils overlap in age, 83.6 to 72.2 million years ago, but no rock formation holds both.

Going by the ages and rock formations of their dated fossils, as on the map. Compare their fossil sites on the map.

Connections

Genera linked to Protoceratopsidovum by where and when their fossils were found, by classification and by who named them. Select a name to open its page.

ProtoceratopsidovumFound in the same rocksSame familySame naming authorAlso found in MongoliaProtoceratopsVelociraptorBagaceratopsPinacosaurusand 32 morePreprismatoolithusPrismatoolithusSankofaSpheruprismatoolithusMegaloolithusSubtiliolithusTrachoolithusElongatoolithusFaveoloolithusCoralloidoolithusDendroolithusand 35 more

Found in the same rocks 36

Genera and other fossil types from the same rock units, from rocks of overlapping age, the most shared fossil sites first.

ProtoceratopsVelociraptorBagaceratopsPinacosaurusElongatoolithusFaveoloolithusCoralloidoolithusDendroolithusSaichaniaShuvuuiaSpheroolithusAvimimusByronosaurusCitipatiConchoraptorMacroolithusand 20 more

Same family: Prismatoolithidae 4

Other genera in Prismatoolithidae with a full profile.

PreprismatoolithusPrismatoolithusSankofaSpheruprismatoolithus

Named by Mikhailov 3

Genera whose naming authority includes the same surname. The authority has no initials, so different people who share a surname can appear together.

MegaloolithusSubtiliolithusTrachoolithus

Found in Mongolia 39

Other genera found in Mongolia, from rocks of overlapping age, the most fossil sites there first.

ProtoceratopsVelociraptorPinacosaurusBagaceratopsElongatoolithusFaveoloolithusCoralloidoolithusDendroolithusSaichaniaShuvuuiaSpheroolithusAvimimusByronosaurusCitipatiConchoraptorHayaand 23 more

Credits

Where this page comes from