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Siphonophorae

The Siphonophorae or Siphonophora, the siphonophores, are an order of the hydrozoans, a class of marine animals belonging to the phylum Cnidaria. According to the World Register of Marine Species, the order contains 188 species. Although a siphonophore may appear to be an individual organism, each specimen is in fact a colonial organism composed of small individual animals called zooids that have their own special function for survival. The zooids are asexually produced and, after budding, occupy permanent positions in a colony. Their organization is very specific compared to other colonial organisms, and the siphonophore colonies exhibit high divisions of labor. Most colonies are long, thin, transparent floaters living in the pelagic zone. Some siphonophores, such as the venomous Portuguese man o' war and the Indo-Pacific man o' war, superficially resemble jellyfish.

Another species of siphonophore, Praya dubia, is one of the longest animals in the world, with a body length of 40–50 m (130–160 ft). The term originates from the Greek siphōn 'tube' + pherein 'to bear'.

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Introduction

Distribution and Habitat

Deep Sea

Phenotype

Bioluminescence

Taxonomy and Phylogeny

Biology and Ecology

Colonies

Zooids

Anatomy and Morphology

Bioluminescence

Behavior

Feeding

Predators

History

Discovery