Hydroidolina is a subclass of Hydrozoa and makes up 90% of the class. Controversy surrounds who the sister groups of Hydroidolina are, but research has shown that three orders remain … अधिक देखें

Hydroidolina are commonly found in a variety of marine environments across the world such as deepwater caves or brackish and fresh shallow waters, and can exist as solitary or colonial. … अधिक देखें

Hydroidolina are carnivorous suspension feeders. Motile medusa use their cnidocytes and tentacles to capture prey. अधिक देखें

Cnidarians are united by the common characteristic of having a specialized cell called a cnidocyte, which contains an explosive … अधिक देखें

The Hydroidolina follows a biphasic life cycle, which alternates in occurrence as planula larva, asexual colonial sessile polyps and free-swimming sexual medusa, not all of … अधिक देखें

Alternate classifications
Other hydrozoan classifications, which are beset by paraphyly however, are still often seen. They do not unite the Leptolinae in a monophyletic taxon and thus do not have any merit according to modern understanding … अधिक देखें

The complexity of fauna environments in shallow and deep waters is only increased by benthic polyp colonization. These hydroid … अधिक देखें