haemocoel

navigate by keyword : abdomen animals antennae arthropod blood body bug cavity chitinous circulates class close compound contained diverse exoskeleton eyes group haemocoel head hexapod include insect insecta insects insectum invertebrates jointed largest latin legs living macro million nature one open organisms pair pairs pancrustacean phylum represent species thorax three part totally twig vessels

a bug on a twig Royalty Free Stock Photo

Insects (from Latin insectum) are pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of jointed legs, compound eyes and one pair of antennae. Their blood is not totally contained in vessels some circulates in an open cavity known as the haemocoel. Insects are the most diverse group of animals they include more than a million described species and represent more than half of all known living organisms.