Glossary

63 terms beginning with N · showing 41–63

1. Nitrobacter

   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.

2. Nitrosomonas

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

3. Nitrospira

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

4. nocturnal

   Active at night.

   Used in 72 profiles

5. nomen dubium

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

   Used in 4 profiles

6. nomen novum

   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.

7. nomen nudum

   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.

   Used in 4 profiles

8. nomenclature

   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.

   Used in 5 profiles

9. nominal species

   See nominal taxon.

10. 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 therefore in need of clarification.

    Used in 33 profiles

11. nominotypical taxon

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

12. non-annual breeder

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

13. non-native

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

    Used in 28 profiles

14. nostril

    External opening in the nasal cavity; an external nare.

    Used in 26 profiles

15. notal

    Of or relating to the back; dorsal.

16. notch

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

    Used in 58 profiles

17. notched fin

    A fin with a notch.

18. nuchal

    Of, relating to, or lying on the nape.

    Used in 13 profiles

19. nuchal hump

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

    Used in 42 profiles

20. nuclear family

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

    Used in 6 profiles

21. nucleotide

    Basic structural unit of DNA and RNA.

22. nuptial

    Of, relating to, or occurring during the breeding season.

    Used in 119 profiles

23. nursery

    A place or area where young animals, including fishes, grow or are cared for.

    Used in 71 profiles