Phosphatocopina (alternatively Phosphatocopida) is an extinct group of bivalved arthropods known from the Cambrian period.

The basipods and endopods of the biramous limbs had prominently developed endites, while the exopods were typically annulated, and bore setae.

[3] The earliest larval stages of phosphatocopines are known as "head larva", due to them only having the four pairs of cephalic appendages, a feature that is a shared groundplan with most other arthropod groups.

[5] Phosphatocopines are generally thought to have been nektobenthic (swimming close to the sediment), and have been suggested to have fed on small particulate organic matter, using the endites and spines on their limbs to trap particles.

[8] The fact that specimens with preserved soft tissue all appear to be larval instars makes their exact placement uncertain.