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Glossary: oak leaf

February 15th, 2012 — 3:34pm

Leaf of the tree and shrub genus Quercus. Dried and used in aquaria to simulate certain natural conditions, especially those typical of blackwater habitats.

Glossary: objective synonym

February 15th, 2012 — 3:34pm

Each of two or more synonyms referring to nominal taxa with the same name-bearing type, or, in the cases of family-group and genus-group taxa, referring to nominal taxa with name-bearing types whose own names are themselves objectively synonymous.

Glossary: obligate

February 15th, 2012 — 3:34pm

In biology, able to exist or thrive only under a certain set of environmental conditions, e.g., an obligate peat swamp-dweller.

Glossary: obtuse

February 15th, 2012 — 3:34pm

Having a blunt or rounded tip.

Glossary: occipital

February 15th, 2012 — 3:34pm

Of or related to the back of the skull or head; occipital bone.

Glossary: occipital bone

February 15th, 2012 — 3:34pm

Median bone on the back of the head

Glossary: occiput

February 15th, 2012 — 3:34pm

Back segment of the skull or head.

Glossary: ocellate

February 15th, 2012 — 3:34pm

Possessing or resembling an ocellus or ocelli; having a spotted colour pattern.

Glossary: ocellus

February 15th, 2012 — 3:34pm

Element of colour pattern resembling an eye; an eyespot or 'false' eye, often present in order to disorient predators.

Glossary: ocular

February 15th, 2012 — 3:34pm

Of or related to the eye or sense of sight.

Glossary: od

February 15th, 2012 — 3:34pm

Abbreviation of the term original description, sometimes used in non-scientific literature.

Glossary: odontode

February 15th, 2012 — 3:34pm

Rigid, dermal structure resembling a tooth or bristle found in certain fish taxa, notably many neotropical catfishes. Also known as a dermal tooth and has a structure comparable to that of an oral tooth, with dentine surrounding a central pulp cavity covered by a superficial layer of enamel or similar material. Often more pronounced or extensively-distributed in […]

Glossary: oedema

February 15th, 2012 — 3:34pm

Excess and subsequent accummulation of watery fluid in cells, tissues, or body cavities of an organism. Also spelled 'edema'.

Glossary: oesophagus

February 15th, 2012 — 3:34pm

Muscular tube through which food passes from mouth to stomach in vertebrates; the gullet. Also spelled 'esophagus'.

Glossary: oil globule

February 15th, 2012 — 3:34pm

Small, spherical droplet of oil found within the yolk sac of fish larvae. There may be one or more present and the size, positioning, and colour are also variable meaning they can be useful in terms of taxon identification.

Glossary: olfactory

February 15th, 2012 — 3:34pm

Of, relating to, or contributing to the sense of smell.

Glossary: Oligochaeta

February 15th, 2012 — 3:34pm

Class of annelids that includes earthworms.

Glossary: oligotroph

February 15th, 2012 — 3:34pm

An organism able to live in oligotrophic environments.

Glossary: oligotrophic

February 15th, 2012 — 3:34pm

Refers to bodies of water containing few nutrients and supporting little in the way of plant life. Opposite of copiotrophic.

Glossary: omnivore

February 15th, 2012 — 3:34pm

An organism that consumes both plants and animals.