The longest living animal on earth is the lighthouse jellyfish. The lighthouse jellyfish is a small jellyfish. The body is bell-shaped, about 4-5 mm in diameter. The body is transparent and the red digestive system can be seen. It looks like a lighthouse, hence its name. The stomach of the lighthouse jellyfish is huge and bright red, with a cross-shaped cross-section. Live mostly in tropical waters. It is carnivorous and feeds on plankton, small crustaceans, polychaetes and even small fish. The lighthouse jellyfish reproduces asexually from a polyp and is the only known organism capable of reverting from a sexually mature stage to a larval stage. It takes 25 to 30 days to reach sexual maturity in water temperatures of 20°C.
The lighthouse jellyfish is a small jellyfish. The body is bell-shaped, about 4-5 mm in diameter. The body is transparent and the red digestive system can be seen. It looks like a lighthouse, hence its name. The diameter and height of the umbrella-shaped body are approximately equal. The protruding side is called the outer umbrella surface, and the concave side is called the lower umbrella surface. There is a hanging tube in the center of the lower umbrella surface, called the vertical lip. The free end of the vertical lip is the mouth. There is a circle of tentacles on the edge of the umbrella, called the hook hand. A narrow membrane-like structure extends inward from the edge of the jellyfish's umbrella, called the limbus membrane. The limbus membrane is a characteristic of jellyfish of the class Hydrozoa. The body wall structure is composed of two layers of epithelial muscle cells with mesoglea sandwiched between them. Four radiating tubes extend from the stomach pouch to the fimbriae, and are connected to the ring tube parallel to the fimbriae. Small centrifugal tubes can also be extended from the ring tube into the tentacles, directly to the end of the tentacles. There are sensory organs such as eyespots or balance sacs at the base of the fimbria or tentacles. The stomach of the lighthouse jellyfish is huge and bright red, with a cross-shaped cross-section.
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