| The groups Hydrozoa, Scyphozoa and Cubozoa all are generally characterized as having polyps and medusae. |
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| These include some Foraminiferida, Hydrozoa and Scleractinia, Bryozoa, Brachiopoda, Pelecypoda, Polychaeta, and Cirripedia. |
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| Another feature that is quite common in Hydrozoa but not typical of Scyphozoa is colonial organization. |
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| Obelia is used in many zoology textbooks to exemplify the Hydrozoa life cycle. |
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| While the Cubozoa always have polyp and medusa stages, either one can be reduced in the Hydrozoa and Scyphozoa. |
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| It is this social character, indeed, which gives the plant-like form to the Hydrozoa and Polyzoa, the Polypes and Zoophytes of the older naturalists. |
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| Traditional systematics divides the Hydrozoa into five orders. |
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| The class Storozoa was the earliest group of Medusozoa to diverge and the Limnomedusae were the earliest Hydrozoa to diverge. |
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| Phospholipase A 2 activity has been detected in the homogenized tentacles and acontia of cnidarians including subphylums Anthozoa, Schyphozoa, Hydrozoa and Cubozoa. |
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| That research also proposes coronate Scyphozoa and Cubozoa as a sister clade to Hydrozoa and discomedusan Scyphozoa, which are themselves sister groups. |
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