[Taxacom] Retaining genus when its type species
isn't diagnosable
Stephen Thorpe
stephen_thorpe at yahoo.co.nz
Tue Dec 6 18:20:24 CST 2016
2016
Hmm, now, Mike! You say"It is a fact that if you don't know what the type species is, you cannot, by definition, know what the genus is".
I disagree! You might know that the type species belongs within a group of cryptic species (which are clearly congeneric), but not know which of them it is (if the DNA cannot be sequenced, etc.)
Stephen
--------------------------------------------
On Wed, 7/12/16, Michael A. Ivie <mivie at montana.edu> wrote:
Subject: Re: [Taxacom] Retaining genus when its type species isn't diagnosable
To: taxacom at mailman.nhm.ku.edu
Received: Wednesday, 7 December, 2016, 1:17 PM
Francisco,
I agree that you can do what
you say, as many practices do not follow
the Code, and in fact work pretty well
anyway. BUT, Stuart asked about
"best practice."Â It is a fact that
if you don't know what the type
species
is, you cannot, by definition, know what the genus is.Â
Anyone
could come along and perfectly
validly (if unadvisedly) designate pretty
much anything as the Neotype, and render all
those other species
incorrectly placed.Â
Arts. 75.3.5 and 75.3.6 give great latitude to
deviate from the original concept.
75.3.5. evidence that the
neotype is consistent with what is known of
the former name-bearing type from the original
description and from
other sources;
*however, a neotype may be based on a different sex or
life stage, if necessary or desirable to secure
stability of nomenclature;**
*
75.3.6. evidence that the neotype came as
*nearly as practicable* from
the original
type locality [Art. 76.1] and, where relevant, from the
same geological horizon or host species as the
original name-bearing
type (see also
Article 76.3 and Recommendation 76A.1);
Best practice requires the stabilization of a
Neotype.
Mike
On 12/6/2016
5:09 PM, Francisco Welter-Schultes wrote:
> You can certainly continue adding species
to that genus.
>
> I
understand that the type species cannot be firmly associated
with
> any existing known species, but
it certainly belongs to a group of
>
species currently regarded to represent that genus. As long
as nothing
> happens the type species
can remain a doubtful name within this genus.
>
> The problem arises
once someone likes to split up the genus, and it is
> impossible to tell to which subgroup the
doubtful type species might
> belong. In
this case some action needs to be taken.
>
> Francisco
>
>
>
Am 07.12.2016 um 00:24 schrieb Stephen Thorpe:
>> Hi Stuart,
>>
There is no real problem that I can see with the type
species of a
>> genus being a nomen
dubium. You could try, if you really wanted to,
>> lodging an application with the ICZN
for designation of a neotype for
>>
the type species, but if they don't see a real need,
they might not
>> bother.
>> Cheers,
>>
Stephen
>>
>>
--------------------------------------------
>> On Wed, 7/12/16, Stuart Longhorn
<sjl197 at hotmail.com>
wrote:
>>
>>Â Â Â Subject: [Taxacom]
Retaining genus when its type species isn't
>> diagnosable
>>Â Â Â To: "taxacom at mailman.nhm.ku.edu"
<taxacom at mailman.nhm.ku.edu>
>>Â Â Â Received: Wednesday, 7
December, 2016, 12:06 PM
>>Â Â
   Can someone explain to me the best practice of
how to treat
>>Â Â Â a
genus/species when the genus is identifiable but the
>>Â Â Â species identity of the
type species is not?
>>Â Â
   e.g. Genus Aus Smith 1900
>>Â Â Â Â With designated type
species Aus xus Smith 1900
>>Â
   and several other species added later.
>>Â Â Â Â Â If the type species
is not identifiable (as a 'species'),
>>Â Â Â but the 'genus'
perse is from that/associated description,
>>Â Â Â is it ok for the genus to
be retained as valid (including
>>Â Â Â possibly adding other
species to the genus), while its type
>>Â Â Â species simply can become
nomen dubium?
>>Â Â
   From this
>>Â
   67.1.2. The name of a type species remains
unchanged even
>>Â Â Â when it
is a junior synonym or homonym, or a suppressed name
>>Â Â Â (see Article
>> 81.2.1<http://www.nhm.ac.uk/hosted-sites/iczn/code/index.jsp?nfv=true&article�#2.1>).
>>Â Â Â Â Â Thanks in
advance
>>Â Â Â Â stuart
>>Â Â Â _______________________________________________
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