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Difference of Male and Female Jellyfish

By Rachel Ingram | Updated October 25, 2017

jellyfish image by cherie from Fotolia.com

Jellyfish belong to the phylum Cnidaria, a structurally simple group of marine animals. Easily identified by a layer of mesoglea or “middle jelly,” jellyfish reproduce sexually and are distinguished as either male or female.

Location of Sex Organs

The reproductive organs, or gonads, develop in the lining of the gut, also known as the gastrodermis.

Identification

Mature gonads are brightly colored and will vary in color depending on the state of the animal’s maturity and sometimes sex.

Male Reproductive Role

Male jellyfish release sperm from their mouth, a method of reproduction known as mass spawning. Some of the sperm will reach the mouth of a female, where fertilization occurs.

Female Reproductive Role

Fertilization occurs once the sperm reach the eggs in the female’s mouth. Depending on the species, the fertilized eggs are either stored in the female’s mouth or in brood pouches on her oral arms.

Physical Differences

Male gonads may be a different color from female gonads. Adult female jellyfish can be identified by the eggs she holds in her mouth or by brood pouches in the oral arms.

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Author

Rachel Ingram is a writer and copy editor at Welcome Home!, a community newspaper covering five different neighborhoods in San Antonio, Texas. She graduated from University of Miami with a B.A. in anthropology and worked in book marketing in New York City for three years before moving to Texas.

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