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Arriagadoolithus
Taxonomy
Arriagadoolithus was named by Agnolin et al. (2012).
It was assigned to Arriagadoolithidae by Agnolin et al. (2012), Moreno-Azanza et al. (2014) and Fernández (2016).
It was assigned to Arriagadoolithidae by Agnolin et al. (2012), Moreno-Azanza et al. (2014) and Fernández (2016).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2012 | Arriagadoolithus Agnolin et al. p. 35 |
| 2014 | Arriagadoolithus Moreno-Azanza et al. p. 848 |
| 2016 | Arriagadoolithus Fernández p. 93 |
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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.
G. †Arriagadoolithus Agnolin et al. 2012
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†Arriagadoolithus patagoniensis Agnolin et al. 2012
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. L. Agnolin et al. 2012 | The unique combination of following microstructure characters distinguish Arriagadoolithus from remaining egg-types: three layers (external, prismatic, mammillary) of distinct calcite texture in eggs with a diameter of ca. 70 mm (?maximum width) and unknown length; average value of eggshell thickness 1 mm; variable ornamentation of the outer shell surface including low irregular-shaped nodes, isolated node-like ridges, and low long ridges interconnected with each other to form a net, thus the combination of plexi-ramo-tuberculate and unique dendro-reticulate ornament may represent autapomorphic character of this oospecies; microlaminated external layer (90e100 mm) with two distinct textures; unevenly distributed squamate texture in the prismatic layer; visible prismatic columns, tubocanaliculate and obliquicanaliculate pore system with funnel-like openings on the outer surface; large pneumatic canals expanded into spatial chambers (up to 270 mm in diameter) within the prismatic layer (this latter feature may represent an autapomorphy of this oospecies); prismatic to mammillary layer thickness ratio 4.9:1 to 4.4:1. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| References: Benton 1983, Marsh 1875 | |||||
Age range: base of the Late/Upper Campanian to the top of the Early/Lower Maastrichtian or 83.50000 to 66.00000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Campanian - Early/Lower Maastrichtian | Argentina (Río Negro) | Theropoda indet. (28459) |