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An animal or plant group that is closely related and forms a unit. It is a taxonomic group of any rank, such as a species, family, or class.

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A group of organisms believed to have evolved from a common ancestor, according to the principles of cladistics.

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A branching diagram showing the inferred evolutionary relationships among various biological species or other entities based upon similarities and differences in their physical or genetic characteristics.

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A cartilaginous, skeletal, rod-like bodily support structure (found in all embryonic and some adult chordate animals). It is usually replaced by a vertebral column.

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The biological process by which an animal physically develops after birth or hatching, involving an abrupt change in the animal's body structure through cell growth and differentiation.

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The primary body cavity of most invertebrates, containing circulatory fluid (blood).

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A paraphyletic class of annelid worms, generally marine. Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called chaetae, which are made of chitin

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A group of parasitic flatworms that probably evolved from free-living forms millions of years ago

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A free-living flatworm that is non-parasitic.

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A group of parasitic flatworms that probably evolved from free-living forms millions of years ago

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extending along or denoting an axis joining the dorsal and ventral surfaces (from top to bottom)

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A solitary or colonial sedentary form of a coelomate (e.g. sea anemone) typically having a columnar body with the mouth uppermost surrounded by a ring of tentacles.

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An organ that produces gametes; a testis or ovary.

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A free-swimming sexual form of a coelomate such as a jellyfish, typically having an umbrella-shaped body with stinging tentacles around the edge.

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A coelomate of an order that includes the hydras (minute freshwater coelomates with a stalklike tubular body and a ring of tentacles around the mouth). They are distinguished by the dominance of the polyp phase.

Most hydrozoan species include both a polypoid and a medusoid stage in their lifecycles, although a number of them have only one or the other. E.g. Hydra has no medusoid stage.

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A stinging cell containing one giant secretory organelle (or cnida)  that defines the phylum Cnidaria (corals, sea anemones, hydrae, jellyfish, etc.)

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A specialized cell in the tentacles of a jellyfish or other coelenterate, containing a barbed or venomous coiled thread that can be projected in self-defense or to capture prey.

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A gelatinous layer between the external and internal layers of the body wall

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Fixed to one spot. Doesn't move/

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A body cavity.
Acoelomate - animals have no body cavity between endoderm and ectoderm.
Coelomate - animals do have a body cavity.

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The study of how organisms evolved.

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A loosely organized, mainly mesodermal unspecialised embryonic tissue.

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Having a body derived from three embryonic cell layers (ectoderm, mesoderm, and endoderm)
E.g. all multicellular animals except sponges and coelomates

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Having a body derived from only two embryonic cell layers (ectoderm and endoderm, but no mesoderm)
E.g. sponges and coelomates.

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Forms the wall of the digestive system. Is a primary germ layer.

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The outer embryonic layer. It forms the skin and hair and makes the neutral tube that becomes the central nervous system in Chordates.

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Body parts are arranged around a central axis. They can be divided into mirror images by an imaginary line through vertical planes.

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Tending to have a distinct head. E.g. Humans have distinct head (well cephalised) whereas worms do not.

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One of the major groups of similar organisms. Each kingdom is divided in phyla, which are divided into classes.