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Agathis immortalis
Discussion
The specific epithet immortalis (Latin: immortal, deathless) refers to the presence of this Agathis species just 2 Myr after the biotic crisis at the Cretaceous–Paleogene boundary.
Taxonomy
Agathis immortalis was named by Escapa et al. (2018). Its type specimen is MPEF-Pb-5867, a multi organs (Leaves, pollen cones, ovuliferous complexes, seeds), and it is a 3D body fossil. Its type locality is Palacio de los Loros 2, which is in a Danian fluvial siliciclastic in the Salamanca Formation of Argentina.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2018 | Agathis immortalis Escapa et al. |
| 2020 | Agathis immortalis Stiles et al. |
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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.
†Agathis immortalis Escapa et al. 2018
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| I. H. Escapa et al. 2018 | Leaves subopposite, narrow-elliptical to narrow-lanceolate, up to 12 cm long, length to width ratio 7–9:1. Leaves with margin entire, apex obtuse to acute, and basally reduced in width. Leaves amphistomatic, although scarce and isolated stomata are seen on the adaxial surface, with majority of stomata oriented parallel to venation. Pollen cones axillary, cylindrical at maturity, ca. 40 × 5 mm, subtended by adpressed basal bracts (at least two pairs); micro-sporophylls peltate, imbricate. Pollen monad, apolar; inaperturate, densely ornamented with irregularly spaced gemmae. Ovuliferous complexes broadly triangular, broader than long, apical margin thickened and upturned or recurved, a single seed scar centrally disposed, lacking basal embayments. Seeds composed by a central body and two lateral, slightly asymmetrical wings. |
Measurements
No measurements are available
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| Source: c = class, p = phylum | |||||
| References: Kiessling 2004, Bush and Bambach 2015 | |||||