A Grammatical Dictionary of Botanical Latin

subkingdom, pertaining or relating to the: subregnalis,-e (adj.).

- nomen subregnale, the subkingdom name.

Subkingdom: subregnum,-i (s.n.II), abl. sg. subregno; a taxonomic rank below Kingdom and above Infrakingdom. Some authors ‘branch,’ ramus,-i (s.m.II) is an additional rank between subkingdom and infrakingdom, e.g. Ramus Protostomia, Ramus Deuterostomia (Cavalier-Smith); “because of its position, branch can be considered as a minor rank of the kingdom group even if it is not etymologically derived from it” (Wikipedia, March 2013).

Subregnum Thallobionta [thallus + nom. pl. of -bion, gen.sg.-bionti] Note that the rank is singular and the name at the rank is a plural noun [using the form of a Greek neuter plural participle.

  Nom. Subregnum Thallobionta 

 
  Gen. Subregni  Thallobiontum
  Dat. Subregni  Thallobiontibus
  Acc. Subregnum Thallobionta
  Abl. Subregno  Thallobiontibus

- subregnum novum a subregno Thallobiontibus sporis motilibus differt, new subregnum differs from subregnum Thallobionta by the motile spores.

NOTE: Kingdom Eubacteria was divided into two subkingdoms: Negibacteria (Gram negative bacteria) and Posibacteria (Gram positive bacteria);

Subkingdom Negibacteria [sg. bacterium,-i (s.n.II]

Subkingdom Posibacteria [sg. bacterium,-i (s.n.II]

NOTE: all taxon names above the rank of family are plural nouns. Their initial letter is capitalized (Code of Nomenclature Art. 16; 2006).

NOTE: a noun used to describe another, and denoting the same person or thing, agrees with it in case: e.g. above: subregno (abl.) and Thallobiontibus (abl.) even though one is a singular and the other a plural noun.