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Table 1 Criteria for classification of gonadal phases

From: De novo transcriptome assembly from the gonads of a scleractinian coral, Euphyllia ancora: molecular mechanisms underlying scleractinian gametogenesis

Gonad Phase The most represented germ cells observed in the gonads Approximate timings of collection in 2016 to 2017
Ovary Early Oocytes with cytoplasmic polarization (<125 μm in diameter) October, 2016
Middle Oocytes with accumulation of yolk and other components (126-200 μm in diameter) December, 2016
Late Oocytes with accumulation of yolk and other components (201-275 μm in diameter) February, 2017
Premature/ mature Oocytes with ‘U’-like germinal vesicles and GVBD (>276 μm in diameter) April, 2017
Testis Early Spermatogonia February, 2017
Middle Spermatogonia and primary spermatocytes March, 2017
Late Secondary spermatocytes and spermatids April, 2017
Mature Sperm June, 2017