Have you seen photos of anemone-like colonies on the ocean floor? Ever met
Obelia asexual reproduction advantages jellyfish, online or in real life? These are creatures in the genus Obelia, which appear to be very different to the casual observer, but they are actually forms of the same animal at different Obelia asexual reproduction advantages in its very complex life cycle.
It is difficult to imagine a more perfect example of strange animal species than those of Obelia. The Obelia life cycle
Obelia asexual reproduction advantages as immobile polyp colonies that contain digestive hydranth and reproductive gonangium units.
The gonangium reproduce asexually, releasing medusa by budding. The medusa, or jellyfish, swim freely and reproduce sexually, releasing eggs and sperm into the water. The resulting fertilized eggs develop into larvae, which attach to the ocean floor as new polyps.
These animals belong to the class Hydrozoa and phylum Cnidaria and include many species. Because Obelia start out as
Obelia asexual reproduction advantages polyps, which are small, immobile animals with stalks and tentacles that resemble sea anemones, the common term for Obelia is sea fur. Perhaps the Obelia asexual reproduction advantages interesting Obelia asexual reproduction advantages of Obelia is that their reproduction strategy requires two distinct stages and two generations to complete.
Obelia asexual reproduction advantages first stage of the Obelia life cycle is the polyp stage. All Obelia begin life as polyps connected to a solid surface like the ocean floor.
Over time, the polyp grows until it forms a colony including hydranth and gonangium units. The hydranth portions of the colony contain mouths and stomachs and enable the colony to feed. The gonangium portions are the reproductive units in the colony.
These members Obelia asexual reproduction advantages asexually by budding, releasing free-swimming medusa.
Medusa are jellyfish bearing the characteristic bell shape and tentacles. At this stage, the Obelia medusa swim freely and reproduce sexually by releasing either eggs or sperm into the water.
Upon fertilization, the resultant zygote develops into a free-swimming Obelia asexual reproduction advantages plural: This larva uses the cilia to swim while developing. Eventually, the animal reaches the ocean floor and develops into a polyp. This begins a new life cycle. Obelia are fascinating and strange animals who use both asexual and sexual reproduction as part of a single reproductive strategy. What's even more odd is that this reproductive strategy requires two generations the polyp generation and the medusa generation to complete one life cycle.
Melissa Mayer is an eclectic science writer with experience in
Obelia asexual reproduction advantages fields of molecular biology, proteomics, genomics, microbiology, biobanking and food science. She has also served as interim associate editor for a glossy trade magazine read by pathologists, Clinical Lab Products, and wrote a non-fiction YA book Coping with Date Rape and Acquaintance Rape.
She has two books forthcoming covering neuroscience of mental health. References Florida State University: First Generation University of Alberta: How Do Roundworms Reproduce?
Fun Facts About Oysters for Kids. Life Cycle of Obelia. Depending on which text editor pasting into, you might have to add the italics to the site name. The Anatomy of the Hydra. Copyright Leaf Group Ltd.