This low-energy existence allows them to thrive in oxygen-poor "dead zones" where other marine life cannot survive, highlighting their resilience and adaptability to changing ocean conditions. The bell, or umbrella, functions as a hydrofoil, contracting to propel the creature forward and drawing water in for filter feeding.
Jellyfish Cnidaria Nematocysts Prey Capture Mechanism
Suspended within the bell is the gastrovascular cavity, a single opening that serves as both mouth and anus, efficiently managing digestion and waste expulsion. It begins as a tiny larva, or planula, which settles on the seabed and develops into a polyp.
Upon contact with prey, the nematocysts discharge with incredible force, injecting venom that paralyzes small fish and plankton. This sedentary stage resembles a tiny sea anemone and can reproduce asexually by budding.
Jellyfish Cnidaria Nematocysts Prey Capture Mechanism
Diversity and Lifecycle: From Polyp to Medusa The class Scyphozoa, or "true jellyfish," showcases a dramatic lifecycle that alternates between asexual and sexual reproduction. These gelatinous drifters belong to the phylum Cnidaria, a group defined by specialized stinging cells known as cnidocytes.
More About Jellyfish cnidaria
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