LORICA STRUCTURE AND VARIABILITY IN TRACHELOMONAS-TUBERCULATA MIDDELHVAR NEVADENSIS SANCHEZ-ET-DE-LA-ROSA VAR NOVA (EUGLENOPHYCEA)

We describe light microscopic and scanning microscopic observations in a population of Trachelomonas characterized by a tuberculate lorica ( in mature cells), a ring of perforations around the flagellum pore and a slight ridge made up of free or joint tubercles. A granular substru cture of the lorica is also evident. We discuss the inclusion of this population in one of the different taxa of the subsections Sphaericae and Ellipticae which have tuberculated lorica, and we conclude that ou r material represents a new varietal taxon of Trachelomonas tuberculat a Middelh.