black and white portrait

描述：

Notosolenus (note-owe-so-lean-us) urceolatus Larsen and Patterson, 1990. Cell outline is posteriorly broad and anteriorly narrow with a small neck around the flagellar canal. The cells are 8 to 17 microns (mostly 13 to 15 microns) and 7 to 11 microns wide. This species has three dorsal keels, two lateral ridges and three fine ventral ridges. The right and left ventral ridges extend from the flagellar canal. The left one curves slightly from the anterior to the posterior and in some cells it forms an arc. The median ridge extends from the small protrusion near the anterior end of the cell. This species has an asymmetric posterior end with a small protrusion. With two flagella of unequal length, the anterior flagellum is slightly longer than the cell, and the posterior flagellum about 0.6 to 0.8 times cell length, is recurrent and inserts to the left of the ventral protrusion in the neck. The reservoir lies in the right hand side of the cell and the nucleus in the left. The cells glide slowly with the anterior flagellum directed anteriorly. Common.