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Species affinis
Species affinis (commonly abbreviated to: sp. aff., aff., or affin.) is taxonomic terminology in zoology and botany. In open nomenclature it indicates that available material or evidence suggests that the proposed species is ''related to'', has an ''affinity'' to, but is ''not identical to'', the species with the binomial name that that follows. The Latin word ''affinis'' can be translated as ''closely related to'', or ''akin to''.
An author who inserts ''n.sp.,'' or ''sp.nov., aff'' before a species name thereby states the opinion that the specimen is a new, previously undescribed species, but that there may not (yet) be enough information to complete a formal description. To use aff. alone, implies that the specimen differs suggestively from the holotype but that further progress is necessary to confirm that it is a novel species.
An example would be: a gastropod shell listed as ''Lucapina'' aff. ''aegis'' would mean that this shell somewhat resembles the shell of ''Lucapina aegis'', but is thought more likely to be another species, either closely related to, or closely resembling ''Lucapina aegis''. In a suitable context it also may suggest the possibility that the shell belongs to a species that has not yet been described.
The use of aff. is similar to other indicators of open nomenclature such as cf, sp., or ?〔
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Species affinis」の詳細全文を読む
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