Abstract
Ten algal species are reported for the first time from Saudi Arabia (5 Cyanophyta, 5 Chlorophyta) growing epizoically. The algae were discovered on the surfaces of 3 species of snail, 1 species of turtle and 1 species of frog. Snails were covered mostly by the green algae Cladophora glomerata and Enteromorpha intestinalis. The green alga Basicladia chelonum (newly recorded for Saudi Arabia) and the blue-green alga Microcystis robusta were the most common algae on turtles. Frogs were dominated by a species of the green alga Chlorella.