Genus of annelid worm of which two species, E. albidus and E. buchholzi, are cultured by aquarists to use as fish food.

Threatened by extinction.

Belonging or native to a particular area or country.

Dwelling within the sediment at the bottom of a water body.

Of, relating to, or denoting glands that secrete hormones or other products directly into the blood: ‘the endocrine system’.

A parasite that lives inside its host. Opposite of ectoparasite.

Used in reference to a closed drainage basins with no outflow to other bodies of water, the bottom of which often contains a salt lake or salt pan. Water leaves only via evaporation or seepage.

A symbiotic organism that lives within the body of its host.

Form of symbiosis in which one organism lives inside the other

Above, or on the dorsal side of, the axis of the skeleton.

Section of the caudal fin located between the base and dorsal margin.

Short-lived; transitory; existing only briefly.

Bone or cartilage forming the upper part of the gill arch, positioned between the ceratobranchial and pharyngobranchial.

Present in some microphagous fishes and comprises a paired dorsal diverticulum located towards the posterior of the pharynx. In the majority of species it's divided into two sections by additional gill rakers which trap small food particles.

The outermost, protective, non-vascular layer of skin in vertebrates.

Dwelling or existing above ground. Opposite of hypogean.

Arising from or located on a neural arch of a vertebra.

A plant growing attached to another but not parasitic upon it.

Refers to layers of cells that line hollow organs and glands or make up the outer surface of the body. Epithelial cells help to protect or enclose organs and most produce mucus or other secretions. They’re arranged in single or multiple layers, depending on the organ and location.

Located on the dorsal side of the caudal fin; elongate bone which supports the caudal fin rays, positioned above the urostyle and posterior to the last neural spine.