Question

Craspedote medusa is present in which of the following pairs?
(A)Aurelia and Rhizostoma
(B)Pennatula and Aurelia
(C)Rhizostoma and Corallium
(D)Physalia and Halistemma

Answer 1

Hint: Craspedote medusa is present in that pair which is a genus of medium to large rhizostoma tid jellyfish found in the East Atlantic Ocean (the North Sea and the British Isles to South Africa) and the Mediterranean Sea.

Complete answer:
Craspedote medusa is present in Aurelia and Rhizostoma. Rhizostoma and Aurelia belong to class Scyphoza of phylum Coelenterata. These types of animals spend most of their time floating near the surface of the sea. In all of them, the medusa stage is dominant, more complex, and bigger than polyps, which is bell-shaped with hanging tentacles around their margins. The reduced polyps can reproduce asexually moreover as the budding of medusae. The Aurelia belong to the order Discomedusae, while Rhizostoma belongs to the order of Rhizostomeae.

Additional Information: Aurelia is found to be a genus of scyphozoan jellyfish, commonly called moon jellies. There is a minimum of 13 species within the genus Aurelia including many who are still not formally described. it's been known that Aurelia is the best-studied group of gelatinous zooplankton, with Aurelia aurita the best-studied species within the genus; two other species, Aurelia labiata and Aurelia limbata have also been investigated (studies summarized by Arai. An order of discomedusa, or suborder of Discomedusæ, having the parts arranged in fours or multiples of 4, and therefore the single primitive mouth closed up and replaced by several secondary oral apertures, whence several long root-like processes or so-called polypites depend (hence the name), and given four subgenital pouches, distinct (Tetragameliæ) or fused in one (Monogameliæ). Rhizostoma, Cassiopeia, Cephea, and Crambessa are leading genera.
So, the correct answer is ‘Aurelia and Rhizostoma’.

Note: The moon jellyfish tend to possess a variety of various sizes, however, they typically range from 5-38 centimeters in diameter with an average of 18 cm wide and eight cm tall. The polyps of these jellyfish can grow to 1.6 centimeters tall and their ephyrae, the larval sort of the jellyfish, have a mean diameter of 0.4 centimeters.