This redefined the Uniramia as strictly " true " arthropods with exoskeletons and jointed appendages.
2.
The larvae antennae, bear a pair of jointed appendages at the posterior end, and lack abdominal legs.
3.
The posterior thoracic group is made up of six somites, each possessing a pair of long multi-jointed appendages.
4.
The two eyes were on relatively long horizontal stalks; the mouth lay under the head and was a round-cornered square of plates which could not close completely; and in front of the mouth were two jointed appendages which were shaped like a shrimp s body, curved backwards and with short spines on the inside of the curve . " Amplectobelua ", also found at Chengjiang, was similar, smaller than " Anomalocaris " but considerably larger than most other Chengjiang animals.
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