ALPHEUS-ANGULATUS, A NEW SPECIES OF SNAPPING SHRIMP FROM THE GULF-OF-MEXICO AND NORTHWESTERN ATLANTIC, WITH A REDESCRIPTIN OF A-HETEROCHAELIS SAY, 1818 (DECAPODA, CARIDEA, ALPHEIDAE)

Two species of the Edwardsii-group of snapping shrimp, Alpheus heteroc haelis Say and A. estuariensis Christoffersen, have been recorded from coastal estuarine habitats of the Gulf of Mexico and Atlantic coasts of the United States. A new species, A. angulatus, has been discovered to inhabit these habitats across this range and is described and illu strated. The new species is morphologically similar to A. armillatus, the latter being a tropical species. A redescription with illustration s of A. heterochaelis is also provided herein.