What are the key differences between polyps and medusae in hydrozoans?
Hydrozoans typically exhibit two distinct morphological forms: polyps and medusae. Polyps are sessile, cylindrical structures with a mouth surrounded by tentacles on one end. Medusae are free-swimming, bell-shaped forms that are typically involved in sexual reproduction. Histologically, polyps and medusae share similar tissue layers but differ in their organization and function. For instance, medusae possess thicker mesoglea to support their free-swimming lifestyle.
