[Taxacom] early extant angiosperms

Kenneth Kinman kennethkinman at webtv.net
Sat Feb 20 19:11:35 CST 2010

Hi Steve,
      Thanks for the input.  It made me think of a fourth alternative:
"early-divergent dicots".   And today I also remembered a fifth
alternative: paleodicots (palaeodicots)--- which would have the
advantage of being just one word, and also having been used by various
botanists for a longer period of time.  
     It also would more readily indicate that the old dicot Class has
been divided into two separate classes, Class Magnoliopsida
(paleodicots) and Class Rosopsida (eudicots).  On the other hand, both
"basal" and "early-divergent" have been applied to more restricted
groups at the base of the paleodicots.

Steve Manning wrote:
I would vote for "early-divergent angiosperms" to avoid the suggestion
that they are close enough together to be a "single" group giving rise
to monocots and all other dicots or all other angiosperms. 

At 09:12 PM 2/19/2010, Kenneth Kinman wrote: 
>Dear All, 
>         I've been reading some recent papers on early >angiosperms 
>(especially their floral evolution).  There is frequent >(but informal) 
>reference to what I formally refer to as Class >Magnoliopsida (basal 
>dicots).  Some workers tend to refer to this paraphyletic >group as 
>"early-divergent extant angiosperms", while other (like >Endress) seem
>prefer calling them "basal angiosperms".  But not >surprisingly they
>not inclined to attach a formal taxon to this paraphyletic >grouping,
>matter how important and useful they obviously find it. 
>        Anyway, I'm quite happy to continue formally >recognizing this 
>group as Class Magnoliopsida, but I wonder which of the >common names 
>would be preferable.  We are all referring to extant forms, >so I don't 
>feel a great need to include that particular detail, but >otherwise, 
>which of the follow three would be preferable as a common >name of my 
>Class Magnoliopsida: (1) basal dicots; (2) basal >angiosperms; or (3) 
>early-divergent angiosperms.  Here is the relevant part of >my 2009 
>classification as a reference: 
>   1 Class Magnoliopsida%% (basal dicots) 
>             1 Amborellales 
>             2 Hydatellales (incl. Archaefructaceae) 
>             B Nymphaeales 
>             3 Austrobaileyales 
>             4 {{Liliopsida}} (= monocots) 
>             B Ceratophyllales 
>             C {{Rosopsida}} (= eudicots) 
>             5 Chloranthales 
>             6 Piperales 
>             B Canellales 
>             7 Laurales 
>             8 Magnoliales 
>_a_ Class Liliopsida (monocots) 
>_b_ Class Rosopsida (eudicots) 
>       --------Ken Kinman 

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