FAVOCASSIDULINA TUBERCULATA N. SP., A NEW BENTHIC FORAMINIFER FROM THE PORTUGUESE CONTINENTAL SLOPE

Favocassidulina tuberculata, a new benthic foraminiferal species from Integrated Ocean Drilling Program Site U1391 drilled on the southwest Portuguese continental slope, is de-scribed. This new species has a slit-shaped apertural opening oblique to the test periphery instead of paralleling the periphery as the type species Favocassidulina favus (Brady) does. And more notably, this species possesses a test surface orna-mented with tubercles, quite different from the coarse honey-comb wall structure of F. favus and the finely irregular cancel -late surface ornamentation of other Favocassidulina species. This paper for the first time reports the presence of the genus Favocassidulina in the Atlantic Ocean.