Glossary

70 terms beginning with E · showing 41–70

1. erectile

   Capable of being erected, raised, or elevated, e.g. an erectile fin spine.

   Used in 2 profiles

2. erythrophore

   Chromatophore containing carotenoid pigment and thus having red or orange colour.

3. esociform

   Of fishes, shaped like a pike.

4. ethmoid

   Unpaired skull bone located on the anterior part of the neurocranium and forming a section of the nasal cavity.

   Used in 15 profiles

5. ethmoid

   Light, spongy bone of the skull located between the orbits and forming part of the eye socket and nasal cavity.

6. ethology

   The study of animal behaviour, particularly in the natural environment.

7. etymology

   Branch of linguistics concerned with the origin and development of words. Used in taxonomy when referring to the basis and meaning of a scientific name.

   Used in 27 profiles

8. eukaryotic

   A single-celled or multicellular organism possessing cells containing a membrane-bound nucleus.

9. eurybathic

   Capable of existing over a wide range of water depths.

10. eurybenthic

    Dwelling on the bottom of a water body over a wide range of depths.

11. euryhaline

    Of aquatic organisms, able to tolerate a wide range of salinity. Opposite of stenohaline.

    Used in 11 profiles

12. eurythermal

    Of organisms, able to tolerate a wide range of temperatures.

13. eutrophic

    Having water rich in nutrients, thus promoting the growth of plants, especially algae.

    Used in 1 profile

14. eutrophication

    Hypertrophication; process by which addition of artificial or natural substances, such as nitrates and phosphates, to a body of water increases the concentration of dissolved nutrients, this in turn stimulating the growth of aquatic plant life, especially phytoplankton, and typically resulting in depletion of dissolved oxygen. Negative effects include reductions in populations of fishes and other organisms incapable of withstanding this hypoxia.

    Used in 8 profiles

15. ex gr.

    Abbreviation of the Latin ex grege, meaning 'from the herd, of the group'. Sometimes used between the generic and specific parts of a binomial name when the precise species is not known but the organism can be identified as belonging to a named group of species.

    Used in 2 profiles

16. ex-situ

    The study or maintenance of an organism or groups of organisms outside of the natural habitat

17. ex-situ conservation

    Process of protecting and maintaining an organism outside its natural habitat, e.g., in a zoo or relocation project.

18. excluded name

    A name unavailable for purposes of zoological nomenclature under provision of the ICZN code or because of a disclaimer.

19. exophthalmia

    Abnormal bulging of the eye from the orbit commonly referred to as 'pop eye' in aquarium literature and resulting from excessive accumulation of fluid or gases at the back of the socket. Not a disease but a secondary sympom of some other infection or physical issue.

20. exoskeleton

    External skeleton, often forming a hard, shell-like outer covering typical in insects, crustaceans and some molluscs. Usually chitinous but may also be composed primarily of calcium carbonate or silica.

21. exotic species

    A species occurring outside its known natural range, most often due to accidental or intentional dispersal by human activities. Also referred to as introduced or alien species.

    Used in 19 profiles

22. extant

    Not extinct; surviving; still in existence.

    Used in 7 profiles

23. external filter

    A filter located outside the aquarium, typically holding larger amounts of media than an internal filter and used for larger tanks. Also known as a canister filter.

    Used in 232 profiles

24. extinct

    Of a species or other taxonomic grouping, having no living members; no longer in existence.

    Used in 22 profiles

25. extinction

    The state of being or becoming extinct.

    Used in 35 profiles

26. extirpate

    To destroy completely; to exterminate. Sometimes applied to cases where a species is extinct in one country or area but extant in others.

27. eye diameter

    In ichthyology, the greatest distance between the margins of the eye.

    Used in 38 profiles

28. eye spot

    See 'ocellus'.

29. eyed egg

    A fish egg within which the embryo has developed to a point whereby the eyes are visible through the external membrane.

30. eyed-up

    Term used in the aquarium hobby in reference to an eyed egg.