Species affinis
Taxonomic term indicating that available data suggests that the proposed species has an affinity to, but is not identical to, the species with the binomial name it comes after
Species affinis (commonly abbreviated to: sp., 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 it comes after. 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. L. 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.
This brief starts where responsible research should: with the source description of “Species affinis” as taxonomic term indicating that available data suggests that the proposed species has an affinity to, but is not identical to, the species with the binomial name it comes after. Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the science & nature register because the source frames it as taxonomic term indicating that available data suggests that the proposed species has an affinity to, but is not identical to, the species with the binomial name it comes after. Its deeper value depends on whether names, dates, institutions and citations support that framing.
The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated Dec 21, 2025. The linked authority identifier is Q6148350. None of the 0 selected statements returned an explicit reference.
A general summary may omit uncertainty, sample limits or methodological disagreement that is explicit in the technical record. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Check terminology, classification and the date of the cited evidence. Scientific names and technical consensus can change while older records retain historical value.
- Current terminology
- Classification context
- Finding cited technical literature
Primary datasets, specimen catalogues, standards bodies and the most recent peer-reviewed literature.
Three-step research path
- Establish the record: confirm the title “Species affinis”, its source revision and the description used here.
- Expand the search: follow Species affinis primary sources, Species affinis archive and Species research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Species affinis”?
- Is the terminology current, historical or disputed?
- Which observation, specimen, dataset or publication supports the account?
Search terms from this dossier
This entry incorporates text from “Species affinis” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.