AFFINITIES, EVOLUTION AND TAXONOMY OF ZYGNEMACEAE (CHLOROPHYCEAE) : A REVALUATION | BIONATURE

Simple or branched filaments, symmetrical cells, elaborate chloroplasts, and amoeboid gametes characterise the Zygnemaceae (Meneghini, 1838) family. In their monographs, Transeau (1951), Randhawa (1959), and Kadlubowska (1972) named 13 taxa, including the dubious Entransia Hughes. Ahmad and Goldstein (1971, 1972) later added Lloydiina Ahmad and Goldstein to the Zygnemiaceae family. Sangirellum and Trigonum, two novel members with band-shaped or girdle-shaped parietal chloroplasts and rounded triangular to polster form triangular, axile chloroplasts, were recently reported elsewhere (both unpublished). As a result, the family consists of 16 genera, each of which may be distinguished by the structure of their chloroplasts. However, numerous phycologists (Yamagishi, 1963; Bourrelly, 1966) grouped Hallasia Rosen vinge with Zygnemopsis, resulting in a Zygnemaceae with only 15 genera.

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