38
Algae
single species, a marine filamentous alga isolated from the Tirrenian Sea; the cells possess a wall
containing alginates but lacking cellulose (Figure 1.1at). Chrysomerophyceae are filamentous marine
or brackish algae, epiphytic on halophytes, or algae (Figure 1.1au). Picophagophyceae contains both
photosynthetic and nonphotosynthetic phagothrophs with filopodia or reticulopodia; the status of
these algae as a distinct class has been questioned (Figure 1.1av). Pinguiophyceae are all single-celled
microalgae from picoplankton size to over 40 μm (Figure 1.1az). They deserve mentioning because
of the unusually high percentage of polyunsaturated fatty acids, especially eicosapentanoic acid
FIGURE 1.51 The silicoflagellate Disthepanus speculum.
FIGURE 1.52 Frond of Bellotia eriophorum. Scale bar: 5 cm.