The Order Leptostraca is divided into three genera containing a total of around 40 validly described extant species:
2.
"' Phyllocarida "'is a subclass of crustaceans, comprising the extant order Leptostraca and the extinct orders Hymenostraca and Archaeostraca.
3.
There is less agreement on the status of the subclass Phyllocarida with its single extant order, Leptostraca, depending on whether foliaceous ( leaf-like ) limbs have a single or multiple origin.
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