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Rhipiduridae

5 points between taxa to make a different species.



Geographic separation/Chance
of cross-breeding
Morphological and plumage differences Voice

Song/Calls

Habitat preference
Behaviour
including
migration
Known
DNA differences

Total Points
sp
or
subsp

Scoring 0-1-2-3 0-1-2-3 0-1-2-3 0-2-3-4 0-1-2-3 0-2-4-5

A SENSIBLE SPECIES DEFINITION (Anderson 1998 and 2012)
Species are populations that are interbreeding and which are reproductively isolated from other such populations by their reproductive isolating mechanisms.
These may include -
     geographic separation / chance of cross-breeding;
    morphological and plumage differences;
    voice;
    habitat preference;
    behavioural differences such as nest-building, social grouping or migration;
    consistent DNA differences.
Each mechanisms can be weighted according to the strength of difference from a recognised species and given a score between 0 and 5; a total of 5 would give the taxon species status.
0
 
 
 
 
 
1
 
 
 
 
 

2

 
 
  
 
3




4





5




Broad hybrid zone





e.g. Narrow and stable hybrid zone,
or good chance of interbreeding.



e.g A small chance of interbreeding.



No chance of interbreeding.

Feather tracts and/or bare parts a little different,


Feather tracts and/or bare parts noticeably different,


Feather tracts and/or bare
parts very different.

Feather tracts and/or bare
parts completely different.
Not so different voice range and/or song phrases.

Noticeably different voice range and/or song phrases,







Completely different voice range and/or song phrases.
Similar or slightly different habitat preferences.








Noticeably different habitats.







Completely different habitats.
Slightly different behaviour.





Noticeably different behaviour.




Very different behaviour.
DNA differences are barely measurable.




DNA differences are measurable.



DNA differences are larger.



DNA differences are large enough to probably have non-viable offspring.




DNA differences are so great that viable inter-breeding would be impossible.




A Review of Particular Species, Using the Sensible Species Definition and Evaluating the Taxon as Above, in the Systematic Order of the World List.
Comparison of a Universally Accepted Species with Other Taxon such as a Subspecies
 Geographic separation/Chance
of cross-breeding

Morphological and plumage differences
Voice

Song/Calls

Habitat preference

Behaviour
differences

DNA differences

Total Points
sp
or
subsp
Research -
Rhipidura rufiventris
Northern Fantail
Rhipidura s. setosa Far Northern Fantail, New Ireland
Rhipidura s. finschii Far Northern Fantail, New Britain
Rhipidura s. gigantea   Far Northern Fantail, Lihir & Tabar
Rhipidura s. tangensis   Far Northern Fantail, Boang & Tanga
Rhipidura s. niveiventris  Far Northern Fantail, Admiralty
Rhipidura s. mussai         Far Northern Fantail, St Matthias

Conclusions -
Although only one of the six subspecies included in the proposed split from Northern Fantail has been looked at, there seems to be little doubt that this is a separate species; the number of subspecies that Rhipidura setosa incorporates has yet to be determined.

0

2




0

2


0

1




0

0







0

0







0

0








0

5







sp

sp