Genealogical line or lineage. Sometimes used as an infrasubspecific category, i.e., below the subspecies level, to refer to populations or individuals which are not given taxonomic names.
Glossary: race
Glossary: radial
In ichthyology, a bony or cartilaginous support for a fin ray or spine.
Glossary: ramified
Split or divided into branches or constituent parts; with branches or extensions.
Glossary: ramify
To split into branches or constituent parts; to send forth branches or extensions.
Glossary: rapacious
Aggressively greedy or ravenous; feeding on live prey.
Glossary: rare
Uncommon; occurring infrequently.
Glossary: rarity
The state or quality of being rare.
Glossary: ray
Any of the bony spines supporting the membrane of a fish's fin including both spines and soft rays.
Glossary: rear
To breed an organism and play some part in caring for the young.
Glossary: red algae
Any member of the division Rhodophyta.
Glossary: redescription
New, updated, corrected or more complete version of a species description.
Glossary: redox
Abbreviation of reduction-oxygenation. Used in reference to a chemical process whereby one substance or molecule undergoes reduction and another oxidation.
Glossary: reduction
Chemical process whereby an atom or ion gains electrons and undergoes a subsequent increase in valence; the act or process of being reduced. Opposite of oxidation.
Glossary: refractometer
Instrument used to measure salinity or specific gravity via the refractive index (basically, the degree that light bends when shined through something) of a liquid. Most models are designed to measure sodium chloride or brine solutions and not seawater which contains a more complex range of salts and minerals, but usually more accurate than a […]
Glossary: refugium
A region that has remained unaltered by a climatic change event and provides an area where relict species are able to survive; in aquaria the term is used to describe an aquarium or other container maintained within a larger system, usually displayed alongside or beneath it, where certain organisms that would not survive in the […]
Glossary: reintroduction
Deliberate release of an organism or group of organisms into an area or habitat previously inhabited by the taxon but from where it has been lost. Primarily carried out for conservation purposes using specimens taken from captivity or relocated from a different area.
Glossary: rejected name
In zoological nomernclature, any name, available, unavailable, or vernacular, for a taxon other than its valid name. Also referred to using the Latin term nomen rejiciendum (nom. rej.).
Glossary: relict
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.
Glossary: replacement name
In zoological nomenclature, an available name used to replace an older available name.
Glossary: reproduction
Production of offspring via a sexual or asexual process.
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