Fig. 2
From: Morphology, taxonomy and mating-type loci in natural populations of Volvox carteri in Taiwan
Light microscopy of sexual reproduction in Taiwanese strains of Volvox carteri f. nagariensis. 2016-tw-nuk-6-1 (male) and 2016-0609-v-1 (female). a Male spheroids (m) developing within parental spheroid. b–d Various ratios of somatic cells to sperm packets (S) in male spheroids. Note 4–12:1 ratio in (a and b), > 50:1 ratio in (c), and 1:1 ratio in (d). e Female spheroids with eggs (E). f Mature zygotes (Z) in female spheroid. g Optical section of mature zygote with reticulate wall