Hermaphroditic organisms include Atlantic scallops, barnacles, cleaner fish, cotton-pad scaleworms, and earthworms.

1. Atlantic scallops

Male scallops roam the bottom of the water until they finally find a suitable mate. The back of a female flat scallop. It doesn't take long for the male scallops to lose their genitals and completely transform into female scallops. Later, another male flat clam will fall on it and transform into a female.

This mating process forms a tower-like chain of scallops, with the lower layers filled with females and the top layer filled with male scallops. This structure will build higher and higher. The only ones wandering around the bottom are male flat clams, while the female flat clams lie motionless on the bottom of the water all day long.

2. Barnacles

Mature barnacles are hermaphroditic organisms—that is, each barnacle has the reproductive organs of both sexes growing at the same time. Barnacles like to live in groups, as if they feel safe in this way, but too dense a colony will cause the death of a large number of barnacle larvae.

Barnacles (scientific name: Balanus), commonly known as "touches", "horse teeth", etc., are arthropods with calcareous shells attached to seaside rocks, often forming dense colonies.

Barnacles are hermaphrodites and most undergo cross-fertilization. During reproduction, they use telescopic tubes to send sperm into other barnacles to fertilize the eggs. The fertilized eggs develop into nauplii within the mother's mantle cavity before hatching. In the larval stage, it can generally be divided into two stages: nauplii and glandular larvae.

3. Liver leech

The parasite has a flat body, a pointed front end, and is hermaphrodite. The adult worms parasitize in the human liver, and the eggs are excreted in the feces. They first develop in freshwater snails and then invade freshwater fish. People will become infected if they eat raw fish or drink water containing larvae. The patient had symptoms such as weight loss, anemia, and hepatomegaly.

4. Cotton-pad scaleworm

This type of scale insect, named for its cotton-pad-like scales, has been causing damage to California orchards. Later, the introduction of its natural enemy, the Australian lady beetle, effectively controlled them.

The insects don't have mating problems because they mate with themselves - a method of mating that is unusual even among hermaphrodites.

5. Earthworms

Earthworms are annelids, but their reproductive methods are very strange. Earthworms mate in groups. They first lie upright and then stick to each other firmly with the mucus they secrete.

At this time, the 15th segment of their body lays eggs, and the 9th and 10th segments absorb these eggs and fertilize them. These eggs are stored in the spine of the earthworm, and after two to three weeks hatch out. This "mating" process of earthworms usually lasts for several hours.

Baidu Encyclopedia - Liver Leech

Baidu Encyclopedia - Barnacle (animal name)

Baidu Encyclopedia - Atlantic Flat Shell

Baidu Encyclopedia —Hermaphroditism (biological term)