Ichthyological terms, not general ones.
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
Broad spectrum antibiotic with the active ingredient minocycline. Used to treat internal and external gram-negative bacterial infections.
Growing or existing below the surface of the ground.
Used in 31 profiles
Term used to describe water with a green-coloured, soupy appearance caused by an excess of phytoplankton in suspension, often as a result of eutrophication. Also known as an algal bloom.
Used in 7 profiles
Of a species or other taxonomic grouping, having no living members; no longer in existence.
Used in 22 profiles
Can be used to refer to any taxonomic group, the characteristics of which are used for defining related, higher or lower ranking groups. For example, the type of a nominal species is a specimen (type specimen), the type of a nominal genus is the nominal species (type species), and the type of a nominal family is the nominal genus (type genus).
Used in 783 profiles
Dwelling or existing above ground. Opposite of hypogean.
Used in 1 profile
Behaviour which benefits other organisms. May be expressed at the level of the individual, group, or more extensive social system.
Used in 2 profiles
A rock with grain size in excess of 256 mm diameter.
Used in 370 profiles
Refers to 'Los Llanos', a wide expanse of tropical grassland located east of the Andes mountains in Venezuela and Colombia. Much of the area undergoes significant seasonal fluctuations in water level due to flooding of the Río Orinoco which flows through it.
Used in 13 profiles
A compressed accumulation of partially-decomposed, chiefly vegetable matter typically found in certain marshes, bogs, and peat swamp forests throughout the world. It forms via breakdown of various plants and other organic materials in water when full decomposition is prevented due to localised acidic, anaerobic conditions. As a result of this somewhat specific nature the organisms inhabiting peaty environments are often stenotypic and found nowhere else. Peat can be used as a fuel when dried and thus has industrial importance in some countries. Also used in aquaria, especially in order to simulate blackwater habitats, either in pure, artificially-granulated or liquid extract form.
Used in 268 profiles
The inability of two or more groups of organisms to interbreed due to the existence of geographical, behavioral, physiological, or genetic barriers. These can be further separated into those being active pre- or post-copulation.
Any member of the yellow-green algae genus Symbiodinium, comprising unicellular, flagellate protozoa that exist within the cells of other protozoa and some invertebrates, especially corals. They thus form an endosymbiosis in which they can provide up to 90% of the host's energy requirements.
The study or maintenance of an organism or groups of organisms outside of the natural habitat
Instrument used to measure the density of a liquid, normally in the form of specific gravity. Can be inaccurate should calcium deposits form on the swing arm, for example, and generally less reliable than a refractometer.
Speciation of a taxonomic group into several forms, each specialised to fill a previously vacant ecological niche, as exemplified by Rift Lake cichlids, for example.
Used in 60 profiles
Natural, isolated, relict artesian springs found in arid, outback Queensland and South Australia. Water stored in deep aquifers seeps to the surface through fault lines in the rock, and the sediments and salts within the spring water form elevated mounds as it evaporates. Most such springs support marginal plant growth that help stabilise the sediment and provide shelter for animals. In South Australia mound springs form an arc of about 400km along the south-western edge of the Great Artesian Basin, although many have disappeared in the last 100 years as a result of water extraction.
Used in 1 profile
External, umbilical cord-like structure present in members of the family Goodeidae and some other fish groups responsible for transfer of nutrients between an adult female and her internally-developing young. May still be attached to fry at birth.
Used in 4 profiles
An organism or group of organisms that exists as a remnant, typically belonging to a formerly abundant group in an environment much changed from that in which it originated; a surviving species from an otherwise extinct taxon.
Used in 5 profiles
Large group of algae often referred to as 'brown algae' in relation to aquaria. Most are unicellular but there also exist colonial types. Very common component of phytoplankton.