1. aff. - Literally means "affinis." An animal appears related but is different.
2. cf. - Literally means "confer." An animal appears similar to an identified species, but without certainty or confirmation.
3. sp. - Abbreviation for species (in the singular). Following a genus, e.g. Cottus sp. it means genus known but species not identified due to lack of knowledge or damage.
3. spp. - Plural of "sp." Example: There are more than one dozen described Panaque spp.
data from fishbase & planetcatfish
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