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Morphology and development of the Portuguese man of war, Physalia physalis
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Journal Article
Morphology and development of the Portuguese man of war, Physalia physalis
2019
Overview
The Portuguese man of war,
Physalia physalis
, is one of the most conspicuous, but poorly understood members of the pleuston, a community of organisms that occupy a habitat at the sea-air interface.
Physalia physalis
is a siphonophore that uses a gas-filled float as a sail to catch the wind. The development, morphology, and colony organization of
P. physalis
is very different from all other siphonophores. Here, we look at live and fixed larval and juvenile specimens, and use optical projection tomography to build on existing knowledge about the morphology and development of this species. We also propose a framework for homologizing the axes with other siphonophores, and also suggest that the tentacle bearing zooids should be called tentacular palpons. Previous descriptions of
P. physalis
larvae, especially descriptions of budding order, were often framed with the mature colony in mind. However, we use the simpler organization of larvae and the juvenile specimens to inform our understanding of the morphology, budding order, and colony organization in the mature specimen. Finally, we review what is known about the ecology and lifecycle of
P. physalis
.
Publisher
Nature Publishing Group UK,Nature Publishing Group
