What is the larval form of echinoderms known as?
What is the larval form of echinoderms known as?
LARVAE OF ECHINOIDEA There is a single larval stage in echinoidea called Echinopluteus which is bilaterally symmetrical. The larva has oval body and long paired ciliated arms that are supported by calcareous skeletal rods.
What is bipinnaria larva?
A bipinnaria is the first stage in the larval development of most starfish, and is usually followed by a brachiolaria stage. Movement and feeding is accomplished by the bands of cilia. Starfish that brood their young generally lack a bipinnaria stage, with the eggs developing directly into miniature adults.
Which are the parts of ophiopluteus larval alimentary canal?
Ciliated bands are present on the edges of arms. 5. The alimentary canal is divisible into mouth, oesophagus, stomach and intestine opening through the anus (Fig. 27.10A).
Which larva is found in phylum echinodermata?
FORMS OF ECHINODERMATA LARVA
| Class of Phylum Echinodermata | Larval form |
|---|---|
| 1. Asteriodea 2. Ophiuroidea 3. Echinoidea 4. Hobturoidea 5. Crinoidea | Bipinnaria & Brachiolaria Ophiopkiteus Echinopkrteus Auricularia Dobolaria & Pentacrinoid |
What is Megalopa larva?
Megalopa larva It has a broad and crab-like unsegmented cephalothorax. The carapace is produced anteriorly into a median spine. The eyes are large, stalked and compound. All the thoracic appendages are well formed of which the last 5 pairs are uniramous.
What is Parenchymula larva?
Parenchymula is the larval stage found in phylum Porifera. Among all the options, Leucosolenia belongs to phylum Porifera while Hydra belongs to phylum Coelentrata, Ascaris belongs to phylum Nematoda and Pheretima belongs to phylum Annelida. So, the correct answer is ‘Leucosolenia’.
Which organs are absent in echinodermata?
Echinoderms lack specialized excretory (waste disposal) organs and so nitrogenous waste, chiefly in the form of ammonia, diffuses out through the respiratory surfaces.
