Female Sepia apama alternate mating with egg-laying and often mate with multiple males between egg-laying events. Mating occurs in the head-to-head position during which the male flushes water over the buccal area before placing spermatophores there. Eggs are extruded singly and held amidst the female's arms - this appears as a bulge in her arms; at this time, sperm from the spermatangia in that area, or sperm released from the sperm receptacle, compete to fertilize the egg. Females then attach their eggs individually to the underside of rocks, ledges and reefs in subtidal rocky habitat.
Hall, K. C. and R. T. Hanlon. 2002. Principal features of the mating system of a large spawning aggregation of the giant Australian cuttlefish Sepia apama (Mollusca : Cephalopoda). Mar Biol 140: 533-545.
Naud, M. J., R. T. Hanlon, K. C. Hall, P. W. Shaw, and J. N. Havenhand. 2004. Behavioural and genetic assessment of reproductive success in a spawning aggregation of the Australian giant cuttlefish, Sepia apama. Anim Behav 67: 1043-1050.
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