[Taxacom] New genus of early angiosperms (Early Jurassic flowers)
John Grehan
calabar.john at gmail.com
Thu Dec 27 15:01:27 CST 2018
So we seem to have good fossil evidence of proboscoid moths in the Jurassic
and how angiosperms as well. Biogeography always indicated as much. No
surprise (to biogeographers anyway).
On Sat, Dec 22, 2018 at 4:20 PM Tony Rees <tonyrees49 at gmail.com> wrote:
> There's a commentary on this article published 5 days ago here:
> https://elifesciences.org/articles/43421 - seems to accept the finds and
> conclusions as published...
>
> Regards - Tony
>
> Tony Rees, New South Wales, Australia
> https://about.me/TonyRees
>
>
> On Sun, 23 Dec 2018 at 04:38, John Grehan <calabar.john at gmail.com> wrote:
>
>> Croizat always said that there were angiosperms in the Jurassic. Nice
>> confirmaton.
>>
>> John Grehan
>>
>> On Wed, Dec 19, 2018 at 9:32 PM 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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>> > Nurturing Nuance while Assaulting Ambiguity for 31 Some Years,
>> 1987-2018.
>> >
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>> Nurturing Nuance while Assaulting Ambiguity for 31 Some Years, 1987-2018.
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