Fig. 1
From: Gonad morphology, oocyte development and spawning cycle of the calanoid copepod Acartia clausi
Female gonad and oocyte development stages of Acartia clausi. a Overview of a gonad showing the ovary with anterior (DVa) and posterior (DVp) diverticula (longitudinal section), b ovary (longitudinal section), c ovary (longitudinal section) with germ cells (GC), multiplication zone (1), synapsis zone (2) and growth zone (3), d oocyte development stage 1 (OS 1), e oocyte development stage 2 (OS 2), f succession of oocytes in oocyte development stage 3 in the anterior diverticula (OS 3e = early, OS 3a = advanced, OS 3l = late), g oocyte development stage 4 (OS 4) with chromosomes situated on the equatorial plate of metaphase I. LV lipid vesicles, M muscle, N nucleus, Nu nucleolus, Ov ovary, Y yolk vesicles. Scale: a, f 50 μm; b, c, d, e 20 μm; g 10 μm