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All Biocode files are based on field identifications to the best of the researcher’s ability at the time.
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Each of the 4 rhopalia of Carybdea sivickisi has 2 complex median eyes and 2 pairs of lateral eye spots – 24 eyes total!
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Mature female Carybdea sivickisi squashed like a Chinese lantern, a diurnal resting position. Feeding and mating occur at night.
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A Carybdea sivickisi planula settles and attaches to a surface, then develops into a polyp (~200-700 um diam) with 2-4 tentacles
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Free-swimming Carybdea sivickisi planula larvae (each planula ~140 microns in diameter)
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"Resting" mature female Carybea sivickisi showing its four rhopalia (stalked clubs with eyes)
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Close-up of an embryo strand containing thousands of Carybdea sivickisi box jellyfish embryos (each embryo ~100 um in diameter)
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Immature male Carybdea sivickisi attached to substrate using sticky pads on the top of its bell, a common daytime rest position.
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After a few weeks in the polyp stage, the tiny Carybdea sivickisi polyps elongate and begin creeping around on the substrate
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Female Carybdea sivickisi releases embryo strand. Strand consists of thousands of embryos linked together by a mucous covering.
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Female Carybdea sivickisi (left) uses 3 of her 4 tentacles to insert sperm bundle into manubrium (oral tube), as male holds 4th
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Male Carybdea sivickisi (top) passes pale orange sperm strands to female, forming a bundle (spermatophore) on female's tentacle
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Male Carybdea sivickisi, tentacles entwined with female's, with spermatophore (strands hanging down from manubrium inside bell)
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Courtship between male (top) and female (bottom) Carybdea sivickisi. The two "dance" until oral openings are in contact.
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Side view of juvenile Carybdea sivickisi swimming.
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Mature male Carybdea sivickisi jellyfish. The eight hemispherical orange structures are the male gonads.
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Mature female Carybdea sivickisi. Long white structures are female gonads (ovaries + gastric pockets); 6 of 8 are visible here.
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