Genus of bacteria previously thought to reduce nitrIte to nitrAte in an aquarium, but which does not occur, or occurs in negligible quantities, in aquaria.

Genus of bacteria which reduces ammonia to nitrIte in an aquarium.

Genus of bacteria which reduces nitrIte to nitrAte in an aquarium.

Active at night.

Dubious name; a scientific name that of unknown or doubtful application.

New name; a scientific name created to replace another scientific name for non-taxonomical reasons, e.g. when the name being replaced is a homonym.

Naked name; a scientific name unavailable for use because it does not have a corresponding description, reference or indication. Can be made available if published in a fashion sufficient to meet the ICZN criteria of availability, in which case the name is attributed to the person making it available rather than the original author.

Branch of taxonomy concerned with the application of scientific names to taxa, based on a particular classification scheme and in accordance with agreed international rules and conventions.

See nominal taxon.

A nomenclatural concept denoted by an available name used in an original description, and based, actually or potentially, upon its name-bearing type but having no defined taxonomic boundaries. Often used when the precise definition of a species or genus is unclear, such as when a name may refer to more than one taxon and is […]

Nominal, subordinate taxon within a family, genus, or species group that contains the name-bearing type taxon within that group that has been divided.

A species that lives and spawns for more than a single year

Used in reference to a species occurring, living, or growing in a region outside its natural geographic range; non-indigenous.

External opening in the nasal cavity; an external nare.

Of or relating to the back; dorsal.

Indentation or incision on an edge or surface. Usually v-shaped.

A fin with a notch.

Of, relating to, or lying on the nape.

A protruding growth of tissue found on the head in sexually-mature, usually male, specimens of certain fishes.

Post-spawning behaviour in which parental duties are shared by both male and female.