Describing an organism or reproductive structure with radiating or branching reproductive cells or gametes arranged in a radial pattern.
From actino- (Greek aktis, 'ray') + gonidiate (from Greek gonia, 'angle' or related to gonid-, from gonos, 'offspring' + -iate, verb-forming suffix). A specialized biological term from 19th-century morphology.
Actinogonidiate organisms represent an evolutionary experiment in reproduction—arranging your reproductive cells radially instead of in a linear or concentrated pattern might distribute risk, but it also makes it harder to protect your offspring, so most complex organisms abandoned this strategy.
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