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From: Ben Finney <ben+python@benfinney.id.au>
Subject: Re: Class hierarchy problem
Date: Wed, 07 Aug 2013 11:58:51 +1000
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Terry Reedy <tjreedy@udel.edu> writes:

> On 8/6/2013 11:36 AM, BrJohan wrote:
>
> > Consider a botanical classification system (somewhat analogous to my
> > 'problem' as it effectively is related to classification of entities):
> >
> > A Domain should know about its Kingdoms,
> > a Kingdom should know about its Phylums,
> > ...
> > a Genus should know about its Species.
>
> As some already said, 'a domain' is an instance of Domain (or possibly
> generic Taxon). We have on Earth one instance of 'Life'.

I think the term for a taxonomic grouping of life, if you want to avoid
specifying some specific level of the taxonomy, is “clade”
<URL:https://en.wiktionary.org/wiki/clade>.

-- 
 \     “First they came for the verbs, and I said nothing, for verbing |
  `\    weirds language. Then, they arrival for the nouns and I speech |
_o__)                           nothing, for I no verbs.” —Peter Ellis |
Ben Finney