Petrolisthes armatus (green porcelain crab) megalopa larva
Notes: This porcelain crab is believed to be native to Brazil. It was found in south Florida in the 1930s and has spread widely as an invasive species. In North Inlet, South Carolina, it has displaced the several native species and is by far the most abundant porcelain crab. The adult porcelain crab is a commensal, living in tubes with invertebrates including the large polychaete, Chaeptopterus.
We rarely collect the megalopa stage of porcellanids in the plankton. Perhaps this intermediate between the zoeae and first crab stage is very brief, or the megalopa are more benthic.
Identified by Dennis Allen, Baruch Marine Lab, University of South Carolina.