cladoceran
Concise Oxford English Dictionary © 2008 Oxford University Press:
cladoceran /kləˈdɒs(ə)r(ə)n/ Zoology
▶noun a minute branchiopod crustacean of the order Cladocera, which includes the water fleas. ▶adjective relating to cladocerans.
– origin from mod. L. Cladocera, from Gk klados ‘a branch or root’ + keras ‘horn’ (because of the branched antennae).
'cladoceran' also found in these Oxford entries:

