What are pelagic larvae?
Pelagic larvae can disperse large distances, colonize new territory, and move away from habitats that has become overcrowded or otherwise unsuitable. A long pelagic larval phase can help a species to break its parasite cycles. Pelagic larvae avoid benthic predators.
What is planktonic larva?
Planktonic larval stage in life gives species a way to disperse. The larvae develop while adrift at sea, often going through many stages before reaching adult body form. The animal groups with larvae in the plankton include, sponges, crabs, sea stars, snails, worms, and fishes.
Which phylum does Trochophore larva belong to?
phylum annelida
They are triploblastic, bilaterally symmetrical and segmented Metazoa. Some of the annelids belong to the Lophotrochozoa lineage. Trochophore larva occurs in phylum annelida.
What is pelagic larval duration?
Pelagic larval duration and growth rate The pelagic larval duration represented by the T GC ranged from 33 to 98 days for the eels examined (Table 4).
What are two advantages of having planktonic larval stages?
The presumed advantages of such larvae include the avoidance of competition for resources with adults, temporary reduct~on of benthic mortality while in the plankton, decreased likelihood of inbreeding in the next generation, and increased ability to withstand local extinction However, the direct~on of evolutionary …
What is the larva of Mollusca called?
veliger, larva typical of certain mollusks such as marine snails and bivalves and a few freshwater bivalves. The veliger develops from the trochophore (q.v.) larva and has large, ciliated lobes (velum). In addition, the mollusk begins to develop a foot and shell during the veliger stage.
Are krill meroplankton?
Holoplankton can be contrasted with meroplankton, which are planktic organisms that spend part of their life cycle in the benthic zone. Examples of holoplankton include some diatoms, radiolarians, some dinoflagellates, foraminifera, amphipods, krill, copepods, and salps, as well as some gastropod mollusk species.
Are crustaceans meroplankton?
Meroplankton includes sea urchins, starfish, sea squirts, most of the sea snails and slugs, crabs, lobsters, octopus, marine worms and most reef fishes.
What marine animals have a larval stage?
Corals, sea stars, and bivalves can all have a planktonic larval stage (although the length of time in the plankton may vary greatly, and some species do not have a planktonic stage at all). Animals such as these that live on or associated with the sea floor are called benthic.