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Glossary: dentition

February 15th, 2012 — 3:29pm

The arrangement, type, and number of the teeth in a particular species

Glossary: deoxygenate

February 15th, 2012 — 3:29pm

To remove oxygen from.

Glossary: depensation

February 15th, 2012 — 3:29pm

Reduction in breeding population size leading to reduced fecundity in the overall population or stock of a species.

Glossary: depressed

February 22nd, 2012 — 10:00am

Vertically or dorsoventrally flattened.

Glossary: derived

February 15th, 2012 — 3:29pm

Used in phylogenetics in reference to a character or character state not present in the ancestral form of a species; apomorphic.

Glossary: derived character state

February 15th, 2012 — 3:29pm

See derived trait.

Glossary: derived state

February 15th, 2012 — 3:29pm

See derived trait.

Glossary: derived trait

February 15th, 2012 — 3:29pm

In phylogenetics, a trait present in an organism which was absent in the last common ancestor of the group being considered; an apomorphy. Also used to refer to traits present in the ancestral form that have subsequently been lost.

Glossary: dermal

February 15th, 2012 — 3:29pm

Of or relating to skin.

Glossary: dermal bone

February 15th, 2012 — 3:29pm

Bone-type ossifying directly from connective tissue membranes and thus lacking a cartilaginous predecessor. Tend to be more numerous in primitive fish forms.

Glossary: dermal denticle

February 15th, 2012 — 3:29pm

See placoid scale.

Glossary: dermis

February 15th, 2012 — 3:29pm

Innermost layer of skin containing nerve endings and blood vessels. Lies under the epidermis and also known as corium.

Glossary: description

February 15th, 2012 — 3:29pm

Used in ichthyology¬†in reference¬†to a written description of a new species, usually in the form of a scientifically-published paper though many have been also appeared in aquarium literature, particularly in the late twentieth century. Also referred to as ‘type description’ or ‘original description’.

Glossary: designation

February 15th, 2012 — 3:29pm

In icthyology, the nomenclatural act by which the type specimen of a previously or newly-established genus, subgenus, species, or subspecies is fixed via an express statement.

Glossary: dessicated

February 15th, 2012 — 3:29pm

Dry; completely dried out.

Glossary: detritus

February 15th, 2012 — 3:29pm

In biology, organic debris most often formed via the decomposition of organisms.

Glossary: diadromous

February 15th, 2012 — 3:29pm

A fish that migrates between fresh and salt waters.

Glossary: diapause

February 15th, 2012 — 3:29pm

Period of suspended development in an organism characterised by greatly reduced metabolic rate; resting phase. Especially common under times of environmental stress, e.g., hibernation, aestivation.

Glossary: diaphanous

February 15th, 2012 — 3:29pm

Delicate, translucent.

Glossary: diatom

February 15th, 2012 — 3:29pm

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.