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Format
The coding system used by this checklist is a hierarchical alphanumeric code of eight
characters that are subdivided into pairs. The first pair represents a major taxonomic level (e.g.
phylum, class, order etc.) which is variable from group to group, the second pair normally
represents family (but may be used to represent subfamily / tribe), and the final four represent
genus, subgenus and species. Each taxon also has the code of the next higher level or ‘parent’
defined. Alphanumeric codes are used for artificial taxa and where the number of names
exceeds the number of characters allocated to a specified taxonomic level.
Annex I Current Code List. Descriptions of column headers:
Field Name Description
CODE Unique eight character code that identifies the
taxon
HIGHER TAXONOMIC LEVELS Higher level name of the taxon
GENUS (SUBGENUS)
SPECIES NAME Species name of the taxon
AUTHORITY The authority for the name of the organism
EXTINCT OR ARTIFICIAL A note concerning the status of the taxon
“PARENT CODE” Code of the next higher taxonomic level in the
list
Annex II Artificial taxa. Descriptions of column headers:
Field Name Description
CODE Code of the artificial taxon
GROUP NAME Name of the artificial taxon
NOTES Components of the artificial taxon
Annex II Changes since 2008. Descriptions of column headers:
Field Name Description
OLD CODE Name in the column headed ‘Current new
code’ in the 28/10/2008 version
OLD NAME Name of the taxon in the 28/10/2008 version
(including Authority)
NEW NAME Name of the taxon in the October 2011 list
NEW CODE Code of the taxon in the October 2011 list
CHANGED Changes made between 28/10/2008 and
30/09/2011
*Maitland, P S (1977). A coded checklist of animals occurring in fresh water in the British Isles,
Edinburgh: Institute of Terrestrial Ecology, 76pp.
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