cakyjukni lujvo

j1 is a crustacean of species/class j2.

Cf. calku, jukni, braxiura, nerfopi.

In notes:

xasyjukni
j1 is a crab/lobster/crayfish/shrimp/krill/[marine crustacean] of species j2.
karkino
x1 is a crab (type of aquatic crustacean) of type x2
nerfopi
x1 is a lobster of species x2.