Description of Hexabranchus sanguineus: Reunion island.
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Dancer (Hexabranchus sanguineus), a nudibranch that swims with a complex gait that combines dorso-ven-tral body undulation with a bilaterally synchronous, large amplitude progressive wave that passes down its mantle. While these animals spend much of their time crawling over coral-reefs (Gohar and Soliman 1963), they also occasionally swim.
Though they are in the same family as snails, they have little or no shell. They are poisonous and very few animals will eat them. The Spanish Dancer is one of the largest sea slugs reaching 15 inches long (40 cm). They are bight red and their swimming motion looks like the waving skirts of a Spanish Dancer.
Note: Depending on the classification, the genus Hexabranchus is placed under the families Hexabranchidae or Chromodorididae; World Register of Marine Species link: Hexabranchus sanguineus.
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T he Emperor shrimp (Periclimenes imperator) is one of the more vividly colored shrimp around. They form what are termed commensal relationships with various species of nudibranch and sea cucumbers (holothurians) but the adults are most commonly seen on the Spanish Dancer (Hexabranchus sanguineus) nudibranch. Because they are quite shy they are not always the easiest shrimp around to.
The World Register of Marine Species (WoRMS) is a major contributor to the LifeWatch Species Information Backbone. Within the backbone, the coordination is taking place at three parallel levels. Each of these levels also relates to WoRMS, as WoRMS constitutes an important part of this backbone.