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Arthropod

Arthropod

Arthropods . Invertebrates that have an articulated chitin exoskeleton . They include trilobitomorphs , merostomes , pycnogonids , arachnids , crustaceans , myriapods and insects . They have had great evolutionary success, as proven by the fact that more than 80% of all known animal species belong to this group. Summary...

Chordata

Chordata

Chordates (Chordata). The animals of this phylum belong to the Deuterostomes branch of the animal kingdom , that is, during embryonic development the blastopore (the first opening of the embryo) gives rise to the anus. In this deuterostome...

Plankton

Plankton

= Plankton . Set of organisms, mainly microscopic, that float in salty or fresh waters, most abundant up to approximately 200 meters deep. Summary [ disguise ] 1 Features 2 Classification 1 Zooplankton 2 Phytoplankton 3 Other classifications 3 Migrations 4 Role in the...

Annelids

Annelids

Annelids. Phylum (phylum) comprising metamerized and vermiform invertebrate animals ; Of these, the most numerous are the marine worms with bristles and the best known are the earth worms. The Annelida (meaning small annules or rings) includes the Polychaeta (meaning many mushrooms);...

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