Question

similarities and differences between ephyra of aurelia and medusa of obelia

Answer 1

Explanation:

So, the difference between the two of them is that medusa produced by the budding of blastostyles and aurelia is produced by the metamorphism of ephyra. Obelia are swimming bells and aurelia are called jellyfish as they possess similar body structures

Answer 2

Answer:

3 structural similarities and 9 major differences between the ephyra of aurelia and medusa of Obelia can be easily seen. They are mentioned below.

Explanation:

Structural similarities that can be found between ephyra of aurelia and medusa of Obelia

1. Both are found swimming or floating freely in the water.
2. Both demonstrate disc shape and which is differentiated into exumbrella surfaces and subumbrella surfaces structurally.
3. Manubrium can be found at the center of the subumbrella surface in both the species which opens into the terminal mouth.

Some of the differences between the ephyra of aurelia and the medusa of Obelia are as follows:-

1. Larva of aurelia is known as Ephyra whereas larva of medusa is called Plannula Larva.
2. The shape of the umbrella is larger in the ephyra of aurelia in comparison to the medusa of obelia
3. The margin of the umbrella in ephyra of aurelia is scalloped into 8 lobes by 8 notches whereas the margins in medusa of obelia are smooth and circular without notches.
4. True velum is absent in ephyra of aurelia whereas there is the presence of true velum in medusa of obelia.
5. Ephyra of aurelia contains a 4-lobed stomach and is produced into 4 gastric pouches. In medusa of obelia, gastric pouches are absent and the stomach is not lobed.
6. Canal system of ephyra consists of 4 pre-radial, 4 inter-radial and 8 adradial canals and a circular canal, whereas in medusa there are only 4 radial canals and a circular canal.
7. Gonads of ephyra are horse-shoe shaped and frilled, whereas gonads of medusa are oral and knob-like.
8. The germ cells of ephyra are derived from endoderm whereas in medusa they are derived from ectoderm.
9. Sensory structures like ocelli and olfactory pits are found in ephyra but they are absent in medusa