the group as a subclass of millipedes. Several living orders also appear in the fossil record. Below are two proposed arrangements of fossil millipede groups. Extinct groups are indicated with a dagger (+). The extinct order Zosterogrammida, a chilognath of uncertain position, is not shown.

Relation to other myriapods

Although the relationships of millipede orders are still a subject of debate, the class Diplopoda as a whole is considered

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