This study examines how Metridium fimbriatum reproduces asexually, sometimes forming several new individuals from one polyp. The work provides detailed observations on the structures involved and the stages of division.

The material comes from a harbor population and from aquarium observations. Among nearly two thousand polyps examined, a small but consistent fraction showed monogenesis, including several modes of division and occasional complex colonies. The report documents the anatomy and progression of divisions, with careful diagrams and notes on the mesenteries, siphonoglyphs, and the oral-aboral axis. It also discusses how environmental conditions may influence fragmentation and budding.

Longitudinal fission, including near-equal and unequal divisions, often aligned with the mouth-to-foot axis.
Basal fragmentation, where fragments detach or break off and form new individuals from the pedal disk.
Budding, arising either from the foot region or from the esophageal region, with varying development of oesophagi and siphonoglyphs.
Colonies of multiple polyps forming from buds or successive fissions, showing diverse patterns of mesentery arrangement.

Ideal for readers of early marine biology and the anatomy of sea anemones, offering a careful look at how a single organism can give rise to several in independent or connected ways.

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