TETREUTREPTIA POMQUETENSIS GEN ET SP-NOV (EUGLENOPHYCEAE) - A QUADRIFLAGELLATE, PHOTOTROPHIC MARINE EUGLENOID

A new euglenoid genus and species, Tetreutreptia pomquetensis, is desc ribed from winter waters of Maritime Canada. This phototrophic species is characterized by four emergent heterodynamic flagella, two about t he length of the cell and two less than one-half this length. Tetreutr eptia pomquetensis has features in common with species of Eutreptiella while it differs in several respects from any of the described specie s of that genus. It could be assigned to the order Eutreptiales or Eug lena morphales sensu Leedale or the order Euglenales sensu Farmer, Thi s new alga has a narrow range of temperature tolerance; it grows best from 0 degrees to 7 degrees C and dies at temperatures above 10 degree s C. The optimum salinity for growth was near full-strength seawater. Growth conditions for the alga define the conditions whence this speci es was isolated.