If a new fossil group of arthropods were discovered,what characteristic would most likely distinguish this group from existing arthropods?

Question

Quizplus · Accepted Answer

The number of segments is a major defining characteristic of arthropods, and a new fossil group with a different number of segments would distinguish it from existing arthropods. Other characteristics such as eye number, body size, egg size, and position of antennae can vary within existing arthropod groups.

If a New Fossil Group of Arthropods Were Discovered,what Characteristic