Model systems based on two or more related species with different types of development are finding increasing use in current comparative embryology. Green algae of the genus Volvox offer an interesting opportunity to study sex pheromones, morphogenesis as well as the formation of a somatic cell line undergoing terminal differentiation, senescence, and death as well as a line of reproductive cells, which at first grow and then undergo a series of consecutive divisions that give rise to new organisms. However, almost all studies of the recent years were conducted on a single species, Volvox carteri f. nagariensis. The goal of this publication was to advertise the cosmopolitan alga V. aureus as a model species in developmental biology. Published data on V. aureus are briefly reviewed in comparison with the development of V. carteri and outlooks of further studies are specified. In particular, the expediency of collecting new V. aureus strains from nature to study their development in clonal culture is outlined.
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