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Glossary: valence

February 20th, 2012 — 10:00am

Combining capacity of an atom or ion determined by the number of electrons that it will lose, add, or share when it reacts with other atoms; the bond-forming capacity of a given atom or radical; a numeric value designated to represent this capacity.

Glossary: valid name

February 15th, 2012 — 3:37pm

The correct, currently-accepted scientific name for a taxon.

Glossary: variant

February 15th, 2012 — 3:37pm

A form or version that differs in some respect from other forms of the same thing or deviates from a standard.

Glossary: variegated

February 15th, 2012 — 3:37pm

Exhibiting differently coloured markings; diversified.

Glossary: várzea

January 20th, 2013 — 5:35pm

Type of seasonally-inundated floodplain forest in the Amazon region. The term is normally used for those forests flooded by whitewater rivers but is sometimes used to refer to blackwater environments for which the more traditional term is igapó.

Glossary: vascularised

February 15th, 2012 — 3:37pm

Containing vessels that carry or circulate fluids, especially blood.

Glossary: vegetative

February 15th, 2012 — 3:37pm

Of, relating to, or capable of growth, or functioning in processes such as growth or nutrition rather than sexual reproduction.

Glossary: Velvet

May 28th, 2012 — 11:40am

See ‘Oodinium‘.

Glossary: venom

February 15th, 2012 — 3:37pm

Poisonous fluid secreted by various animals, including some fishes.

Glossary: venomous

February 15th, 2012 — 3:37pm

Secreting venom; able to inflict a poisonous bite, sting or wound.

Glossary: vent

February 15th, 2012 — 3:37pm

Excretory opening of the digestive tract in fishes.

Glossary: ventral

February 15th, 2012 — 3:37pm

Of, on, or relating to the underside of an animal or plant; abdominal.

Glossary: ventral disc

February 15th, 2012 — 3:37pm

A sucking disc formed by the pelvic fins in certain fishes.

Glossary: ventral keel

February 15th, 2012 — 3:37pm

Fleshy, longitudinal ridge running along the abdomen and caudal peduncle in some fishes.

Glossary: ventral margin

February 15th, 2012 — 3:37pm

Lower edge or margin.

Glossary: ventral-fin

February 15th, 2012 — 3:37pm

Either of the pair of fins, also known as pelvic fins, attached to the pelvic girdle in fishes that help control the direction of movement. Correspond to the hind legs in higher vertebrates and vary in position depending on taxon. Sometimes absent entirely.

Glossary: ventral-fin basket

February 23rd, 2012 — 4:57pm

Vernacular nerm used to describe the post-spawning behaviour of cupping or clamping of the ventral fins in order to transport fertilised eggs.  Exhibited by females of some Corydoras species, for example.

Glossary: ventrolateral

February 15th, 2012 — 3:37pm

Positioned or orientated between the ventral and lateral surfaces.

Glossary: ventrum

February 22nd, 2014 — 10:49pm

Relating to or situated on or close to the abdomen or lower surface of an animal’s body; abdominal

Glossary: vermiculate

February 15th, 2012 — 3:37pm

Having a pattern consisting of irregular, worm-like lines.