[Taxacom] New genus of early angiosperms (Early Jurassic flowers)

[Tony Rees]

Well, the other claimed "Jurassic angiosperms" have thus far not found much
favour with other workers who tend to view them as either not angiosperms,
or not Jurassic. So it will be interesting to see how these examples are
received... plus these are described as Early Jurassic, not Late, which
leaves a rather large gap until the next accepted "flowers" in the
Cretaceous somewhere...

Always room for some new fossils and information, though!

Regards - Tony


On Thu, 20 Dec 2018 at 13:32, Kenneth Kinman <kinman at hotmail.com> wrote:

> Dear All,
>       I didn't plan to post anything further on the origin of angiosperms,
> but a fascinating new genus of angiosperm was named and described this week
> (called Nanjinganthus), and it is from the Early Jurassic.  Although it is
> clearly an angiosperm, it's phylogenetic position has not been determined,
> so it is unclear if it is a stem group angiosperm or a member of the crown
> group.  In any case, it is an exciting development, and here is a weblink
> to the article (and the abstract is given below):
> https://elifesciences.org/articles/38827
>
> Abstract
>
> The origin of angiosperms has been a long-standing botanical debate. The
> great diversity of angiosperms in the Early Cretaceous makes the Jurassic a
> promising period in which to anticipate the origins of the angiosperms.
> Here, based on observations of 264 specimens of 198 individual flowers
> preserved on 34 slabs in various states and orientations, from the South
> Xiangshan Formation (Early Jurassic) of China, we describe a fossil flower,
> Nanjinganthus dendrostyla gen. et sp. nov.. The large number of specimens
> and various preservations allow for an evidence-based reconstruction of the
> flower. From the evidence of the combination of an invaginated receptacle
> and ovarian roof, we infer that the seeds of Nanjinganthus were completely
> enclosed. Evidence of an actinomorphic flower with a dendroid style,
> cup-form receptacle, and angiospermy, is consistent with Nanjinganthus
> being a bona fide angiosperm from the Jurassic, an inference that we hope
> will re-invigorate research into angiosperm origins.
> https://doi.org/10.7554/eLife.38827.001
>
> ________________________________
> From: Taxacom <taxacom-bounces at mailman.nhm.ku.edu> on behalf of Kenneth
> Kinman <kinman at hotmail.com>
> Sent: Friday, December 14, 2018 8:43 AM
> To: taxacom at mailman.nhm.ku.edu
> Subject: [Taxacom] Where (and when) angiosperms originated
>
> Dear All,
>        I've been studying the literature on angiosperm origins, and there
> is apparently a very long period of time between the origin of angiosperms
> and the origin of crown group angiosperms.  I have concluded that where
> angiosperms originated is probably also a totally different place.
>        Crown group angiosperms probably originated in Gondwana, most
> likely in Australia since so many basal families occur in the forests of
> northern Queensland (which in the past were even closer to New Caledonia).
> However, where the first angiosperms originated is a totally different
> question.  My hypothesis is that the first angiosperms perhaps split from
> their probable sister group Caytoniales as far away as Laurasia, rather
> than Gondwana (perhaps in the Permian, if not earlier).
>       Of course, the larger numbers of records of putative angiosperm
> pollen (and Caytonia fossils) in Europe and eastern North America could be
> due to more intensive research in those areas, so an origin in Africa
> shouldn't be ruled out.  What route they took to Australia could depend on
> when that expansion took place.  Papers by Dettmann suggested that they got
> to Australia through Antarctica.  In any case, there is no evidence that
> angiosperms originated in Australia, but there is plenty of evidence that
> crown group angiosperms did originate in Australia (far from where the
> earliest angiosperms originated).
>                          -------------Ken Kinman
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