A variety of species from the order Siphonophorae (image from Ernst Haeckel’s Kunstformen der Natur: 1904)
- (top center): Epibulia ritteriana, mature colony
- (bottom right): Cystalia monogastrica, immature colony
- (center): Salacia polygastrica, colony
- (top left): Salacia polygastrica, gas bladder in cross-section
- (top right): Salacia polygastrica, gas bladder from above
- (bottom left): Salacia polygastrica,partial cluster of polyps (infertile) and medusae (fertile)
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