The outermost layer of cells in an embryo, which gives rise to the skin, nervous system and sense organs.

ectoderme

Female reproductive cell produced by the ovaries, capable of being fertilized by a sperm cell to form a new organism.

ovule

The innermost layer of cells in an embryo, which gives rise to the digestive tract and associated organs.

endoderme

Animals that live within the substrate of the seabed, soil or sediment.

endofaune

An internal skeleton that supports and protects the body of an animal.

endosquelette

Animals that live on the surface of the seabed or other substrates.

épifaune

A plant that grows on another plant for physical support but does not take nutrients from it.

épiphyte

Able to tolerate a wide range of salinities in the surrounding water.

euryhalin

A hard, external skeleton that supports and protects the body of some invertebrates.

exosquelette