Does the Urea Cycle exist in invertebrates? Do invertebrates (like _Drosophila_ and _C.elegans_ ) have a urea cycle?

_C. elegans_ is missing all of the urea cycle enzymes. _Drosophila_ is missing just one enzyme, but there's a shortcut which may enable it to nonetheless complete the cycle. (For comparison, here's the pathway map for human with the complete cycle.)