A new species of Acrenhydrosoma (Harpacticoida, Cletodidae) is describ
ed and illustrated. Specimens were collected during a long term invest
igation of intertidal meiofaunal taxa in Auke Bay, Alaska. Acrenhydros
oma maccalli n.sp. was present in low densities at the 0 m tidal level
from March to July 1992. It is distinguished from A. perplexum (T. Sc
ott) by the number of setae on the terminal endopod segment of swimmin
g leg 1 and from A. karlingi Lang by the ornamentation of swimming leg
5 and the length to width ratio of the caudal rami.