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Nipponoolithus ramosus
Taxonomy
Nipponoolithus ramosus was named by Tanaka et al. (2016). It is considered to be a form taxon. Its type specimen is MNHAH D1-040057, an egg, and it is a 3D body fossil. Its type locality is Kamitaki Bonebed Quarry, Tamba City, which is in an Albian floodplain mudstone in the Ohyamashimo Formation of Japan.
Synonymy list
| Year | Name and author |
|---|---|
| 2016 | Nipponoolithus ramosus Tanaka et al. p. 353 |
| 2020 | Nipponoolithus ramosus Tanaka et al. p. 8 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Nipponoolithus ramosus Tanaka et al. 2016
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| K. Tanaka et al. 2016 | Nipponoolithus ramosus differs from all other ootaxa in the following unique combination of traits: low-relief, branching ridges on the outer surface; eggshell thickness ranges from 0.37 to 0.53 mm (average 0.44 mm); eggshell consists of a mammillary layer and a continuous layer delimited by an abrupt boundary; mammillae composed of acicular or wedge-like crystals; mammillae wider than high; mammillary layer to continuous layer thickness ratio of 1:2 to 1:4. |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Marsh 1875 | |||||
Age range: Early/Lower Albian or 112.03000 to 109.00000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Albian | Japan (Hyogo) | Nipponoolithus ramosus (type locality: 117980 224255) |