Taxacom: Species described based on a single collection

[Scott Thomson]

this would be true of a majority of fossil species, not all and certainly
revisions add further specimens to some. But I would guess the majority
aresingle collections.

Cheers Scott

Em seg., 20 de fev. de 2023 ?s 12:43, John Grehan via Taxacom <
taxacom at lists.ku.edu> escreveu:

> Interesting question. With respect to "how many known only from the type",
> one would require knowledge of revisions where a species may have
> originally been described from a single type, but subsequently known for a
> multitude of specimens. Of course, naming a new species from a single
> specimen can often be tricky if the differences are limited. I am guilty of
> that myself, but in most cases it is likely I would be dead before
> sufficient duplicate material was available, if ever (or they become
> extinct). I figure better to name such specimens now and let the future
> work out synonymies if they exist.
>
> John Grehan
>
> On Sun, Feb 19, 2023 at 3:53 PM Laurent Gautier via Taxacom <
> taxacom at lists.ku.edu> wrote:
>
> > Dear all,
> >
> > We often hear or read: "A huge amount of Amazon plant species are known
> > only from the type" or "Most XIXth century species descriptions are based
> > on a single specimen". But has anybody gone any further in metrics?
> >
> > I am looking for statistics (published or not) on the percentage of
> > species descriptions based on a single specimen (or collection), and
> > possibly its variation across time or geographical area considered.
> >
> > Does that ring a bell to anybody? My main focus is on flowering plants,
> > but all living organisms welcome!
> >
> > Thanks in advance,
> >
> > Laurent Gautier
> > Conservatoire et Jardin botaniques, Geneva, Switzerland
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-- 
Scott Thomson

Centro de Estudos dos Quel?nios da Amaz?nia - CEQUA
Petr?polis, Manaus
State of Amazonas, 69055-010
Brasil

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