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leowsham
Joined: 14 Sep 2006
Posts: 69
Location: Hong Kong
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 Posted: Tue 19 Sep, 2006 12:11 pm Post subject: Issue on specifier |
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11.1. Specifiers are species, specimens or apomorphies cited in a phylogenetic definition of a name as reference points that serve to specify the clade to which the name applies.
For the sake of discussion - should genus be allowed to be used as specifiers in paleontology? One skull does not a species made, it's said, and many-a-times fossils do not resolve well on the species level. Would it be more pragmatic to anchor on a genous plus a well preserved and studied specimen (with authorship and date of publ.)? Please explain and give your rationale, thanks!
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David Marjanović
Joined: 24 Aug 2006
Posts: 137
Location: currently Paris
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| Posted: Tue 19 Sep, 2006 7:00 pm Post subject: |
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Read the rest of Article 11, and you will find that you can directly use specimens as specifiers. You can kiss the "species problem" goodbye.  |
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tmkeesey
Site Admin
Joined: 14 Aug 2006
Posts: 287
Location: Los Angeles, CA, USA
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| Posted: Tue 19 Sep, 2006 9:07 pm Post subject: |
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Ichthyornithes sensu Clarke 2004 is an example of a clade that uses a specimen as a specifier (as well as three extant species as external specifiers).
| Quote: | | . . . the clade stemming from an ancestor that possessed all of the morphologies described by apomorphies 2, 5, 6, 7, 8 (in the Ichthyornis dispar Diagnosis) homologous (sensu Patterson, 1982) with those in YPM 1450 (holotype of Ichthyornis dispar Marsh, 1872b) and more closely related to YPM 1450 than to Aves (internal specifiers of Gauthier and de Queiroz, 2001) (Clarke, 2004:20). |
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T. Michael Keesey
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tmkeesey
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Joined: 14 Aug 2006
Posts: 287
Location: Los Angeles, CA, USA
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| Posted: Thu 05 Apr, 2007 5:24 am Post subject: |
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Just noticed an error in my post. That's Clarke's definition of Ichthyornis, not Ichthyornithes.
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T. Michael Keesey
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