The gonangium reproduce asexually, releasing medusa. The word larva is another way to describe them when they are babies.
3B and C) by lowering the temperature by about 10° . They are hermaphrodytic, meaning they can produce both ova and sperm. Although oocysts are usually only shed for 1-3 weeks, large numbers may be shed. They are predominantly marine, with the notable exception of the family Spongillidae, an extant group of fresh-water demosponges whose fossil record begins in the Cretaceous. Oocysts take 1-5 days to sporulate in the environment and become infective. Asexual reproduction occurs by budding.Figure below shows the sponge life cycle when sexual reproduction is involved. Most sponges live their lives attached to a reef. They are found in both saltwater and freshwater environments.
Sponges reproduce both asexually and sexually.
It is a simple filter feeder which is hard to replace with any other animal because of it's simple life cycle. However, they don’t produce eggs and sperm at the same time. There was a time in their lives when they were little larvae that they were swimming around the water all by themselves. They don't move around. It is well established that gametogenesis can be induced in hydrozoans such as Pelmatohydra oligactis (Fig. Planaria live independently in water. The resulting fertilized eggs develop into larvae, which become new polyps. The obelia life cycle begins as polyp colonies containing hydranth and gonangium.
The sponge is a niche filler. In many species, the same individuals produce both.
Stages of Life There are two basic forms in the life cycle of a sponge.
The medusa, or jellyfish, swim freely and reproduce sexually, releasing eggs and sperm.
Sponges appear to represent an early stage of multicellularity in the animal clade.
The fertilized ova are released into the environment along with waste materials. Porifera: Life History and Ecology Sponges come in an incredible variety of colors and an amazing array of shapes. Unsporulated oocysts are shed in the cat’s feces .
Adult sponges produce eggs and sperm. Life Cycle: The only known definitive hosts for Toxoplasma gondii are members of family Felidae (domestic cats and their relatives).
In both cnidarians and sponges, temperature frequently plays a critical role in mediating life cycle transitions. The sponges and the cnidarians represent the simplest of animals. Planaria Life Cycle. In other cnidarians, both a polyp and medusa form exist, and the life cycle alternates between these forms. Both kinds of reproductive cells are released into the central body cavity.