Classification of the Phylum Arthropoda
Phylum called Arthropoda (arthropods)
is the largest and most successful
of the animal phyla. All arthropods
have segmented bodies divided into
a head, jointed legs and abdomen.
The major Classes of living arthropods
are as follows with one example each:
Class Arachnida - spiders
Class Crustacea - crabs
Class Merostoma- horseshoe crabs
Class Diplopoda - millipedes
Class Chilopoda - centipede
Class Insecta or Hexopoda - insects
Class trilobites are an extinct group of arthropods that lived in the seas
of the world for about 380 Mya (million years ago), from the Precambrian 610 Mya
to around the end of the Permian 230 Mya.
Class Insecta – true insects are the most important members of the
phylum Arthropoda. Typical adult insects have one pair of antennae, three
pairs of legs, and three body regions: head, thorax, and abdomen. The class
Insecta is divided into some 29 to 40 major orders. Insects make up more than
half of all living things in the world. There are more than a million known species
of insects and there are many more waiting to be discovered.