SUBPHYLUM UNIRAMIA

CLASS INSECTA (insects)
CLASS MYRIAPODA (Centipedes, millipedes, pauropods, symphylans)
The Uniramia are primarily terrestrial, although many species have secondarily invaded freshwaters, - and a few have reinvaded the marine environment. However, the group is thought to have originally evolved in the marine environment as benthic organisms. About one million species of the class Insecta (Hexapoda ) have been described, and estimates are that up to 50 million more remain to be discovered. The uniramia is an extremely diverse and ecologically important group, but because it is not abundant in marine environments will not be treated further in this overview.