For example, hydra has no medusoid stage, while liriope lacks the polypoid stage. World hydrozoa database comes from a list of accumulated taxonomic information assembled over the years from the literature of wim vervoort and peter schuchert (see schuchert, 1989) There is considerable variation in the structure and appearance of hydrozoans
Luna Rose Quartz Crystal Tumble Stones
Most hydrozoan species have a planktonic larval stage called a planula
Planulae are radially symmetric ovoids, often covered with flagellate cells for swimming.
Taxonomic classification, distinctive traits, habitat, and the list of species it includes. Hydra never goes through a medusoid stage and spends its entire life as a polyp However, hydra is not typical of the hydrozoa as a whole. Most common in protected areas such as seagrass flats & harbors
Spends most of time perched on bottom, swimming upward then drifting back down catching demersal zooplankton & benthic crustaceans.
