Mercier and Hamel (2011) studied reproduction in Primnoa resedaeformis (along with two other deep-sea octocorals, Anthomastus grandiflorus and Keratoisis ornata) off eastern Canada. Primnoa resedaeformis is a broadcast spawner with external fertilization. In contrast to the two other octocorals studied, which showed a clear annual breeding pattern, for P. resedaeformis the authors observed mixed size classes of oocytes (immature eggs) in samples from all months, depths, and locations studied, suggesting continuous oogenesis (oocyte production) or overlapping development of oocyte cohorts. Thus, the gametogenic cycle appears to span more than a year. No evidence of periodicity was found in this species, although it could have been masked by the striking bathymetric (depth) variation in potential relative fecundity (i.e., oocytes per polyp). Unfortunately, no spermatocysts (sperm-producing cells) were observed.
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