Taxacom: Extent angiosperm family in the Permian

[John Grehan]

Title to previous email should have been 'extant' of course.

On Wed, Aug 31, 2022 at 7:41 PM John Grehan via Taxacom <
taxacom at lists.ku.edu> wrote:

> Panbiogeographers often get a lot of flak and ridicule for tectonic
> correlations that are much older than the oldest fossil or molecular so
> called means and confidence limits. Well, here's an interesting input. Shi
> et al 2022 "Fire-prone Rhamnaceae with South African affinities in
> Cretaceous Myanmar amber" states:
>
> "We report the discovery of two exquisitely preserved fossil flower
> species, one identical to the inflorescences of the extant crown-eudicot
> Shi et al 2022. Fire-prone Rhamnaceae with South African affinities in
> Cretaceous Myanmar amber"..."genus Phylica and the other recovered as a
> sister group to Phylica, both preserved as inclusions together with burned
> plant remains in Cretaceous amber from northern Myanmar (~99 million years
> ago). These specialized flower species, named Phylica piloburmensis sp.
> nov. and Eophylica priscastellata gen. et sp. nov., exhibit traits
> identical to those of modern taxa...110–99 Ma for Eophylica priscastellata
> and 99 Ma for Phylica piloburmensis"
>
> "The unique floral architecture preserved in Eophylica and Phylica fossils
> is identical to that seen in extant members of the genus Phylica, predating
> molecular clock estimates for the genus by at least 35 Myr"
>
> The we have He & Lamont 2022 "Ancient Rhamnaceae flowers impute an origin
> for flowering plants exceeding 250-million-years ago"
>
> "Setting the molecular clock to newly described 100-million-year-old
> flowering shoots of Phylica in Burmese amber enabled us to recalibrate the
> phylogenetic history of Rhamnaceae.We traced its origin to 260 million
> years ago (Ma) that can explain its migration within and beyond Gondwana
> since that time and implies an origin for flowering plants that stretches
> well beyond 290 Ma."
>
> "The difference in estimated dates between the most recently produced
> chronograms and that described here, using these new fossils, is profound.
> Ignoring the minor error terms in each, previous results are an order of
> magnitude lower for the origin of both Phylica and Phylicieae – the new
> chronogram adds almost 100 My to their ages, as Phylica was previously
> dated at 12–24 Ma"
>
> ". The effect on the estimated age of Rhamnaceae is even more remarkable:
> it is in the order of 150 My compared with that previously reported, 74–103
> M"
>
> ". Any past statistical concerns about large levels of uncertainty
> surrounding the means pale into insignificance compared with the effect of
> the ad hoc presence/absence of fossils used to set the molecular clock, as
> shown here."
>
> So - once again new evidence points not in the direction of 'recent'
> origins, but extant angiosperm families in at least Permo-Triassic times.
> Croizat was ridiculed for his predictions of early origins for modern
> angiosperm families and even genera, but evidently this ridicule may be
> somewhat premature.
>
> John Grehan
> --
>
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