Development of similar forms or traits in related, but separate, species descending from the same ancestor, but occupying different clades.

Genus of unicellular ciliate protozoa with a shape resembling a grain of rice, a number of species of which are cultured as live food for small fishes and fry.  

In phylogenetics, a paraphyletic taxon is, loosely, an artificial grouping that does not include all descendants from the common ancestor of its members; monophyletic group from which one or more of clades is omitted in order to form an additional group.

Organism that lives on or in a second, host organism of a different species, with the latter deriving no benefit or being directly harmed by the relationship.

Of, relating to, caused by, or characteristic of a parasite.

The relationship existing between a parasite and host; the state of being infested by or being a parasite.

Elongate bone located in the base of the skull in many vertebrate organisms.

In zoological nomenclature, a specimen other than the holotype upon which a description is based, i.e., each specimen of a type series other than the holotype.

See broodcare.

Behaviour in which both parents equally share the duties of broodcare.

The most posterior hemal arch with an open canal through which the dorsal aorta passes.

Paired bony lateral extensions off the hemal arch of the parhypural. Also known as ‘hypurapophysis’.

Of, relating to, or forming the walls or part of the walls of a body part, organ, cavity, or similar structure. Often used specifically in reference to either of a pair of bones forming much of the upper cranium.

Method of asexual reproduction by which an unfertilized egg develops into a new individual exhibited by certain fishes.

Unit expressing the part of a whole number in units of 1/1000000. Abbreviated to ppm.

Unit expressing the part of a whole number in units of 1/1000. Abbreviated to ppt.

Relating to, characteristic of, or inherited from the male parent.

Any agent causing disease or infection, especially a bacterium, virus, or other microorganism.

In zoological nomenclature, a taxonomic name derived from the name of a person.

Of or derived from a personal or family name.