Thank you for reporting, we will resolve it shortly
Q.
The characteristic larva of phylum- Coelenterata is
Rajasthan PMTRajasthan PMT 2008
Solution:
Coelenterata (coelom + enteron) or phylum Cnidaria shows both sexual and asexual reproduction. The larval stages are planula (Obelia) and ephyra (Aurelia) Cysticerus (bladder worm) is the third larval stage seen in Taenia besides oncosphere, hexacanth (other two larval stages). Cysticercus is seen after the hexacanhe released in the stomach of pig, which, goes through blood circulation and on reaching muscles get encysted in the form of bladder form. Rhabditiform is the larival stage in Ascaris which is formed within 10-14 days. It is non-infective juvenile stage which rests for a week and completes first moult within egg and becomes second stage rabidity from larva which is infective. The larva is called rhabditiform or rhabditoid because of its close resemblance with Rhabditis. Wriggler is the larva of mosquito. It is free-swimming, active, aquatic larva performing wriggling movements. It has a life-span of 3-4 days.