This copepod was collected in December in Buzzards Bay, MA, USA. There are three images attached. It is ~0.5 mm at widest girth and 1.7 mm in length (not counting antennae, which are longer than body).
I do believe you are correct. Upon closer inspection, I have been able to identify the characteristic "peglike" extension on the caudal rami. Thank you very much for your assistance.