Do Mollusks Go Through Larval Stages

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Both mollusks and annelids develop through a larval stage called a trochophore larva. Trochophore larvae are characterized by having a band of cilia that wraps around the body. … Some mollusks, particularly gastropods, also have a second larval stage that is not present in any other phylum, called veliger.

Like many invertebrates, the mollusk life cycle includes one or more juvenile or larval stages that are very different from the adult form of the animal. Both mollusks and annelids develop through a larval stage called a trochophore larva.

How Do Snails (And Other Molluscs) Create Their Shells?

Essentially all molluscs inhale by gills that are called ctenidia (comb gills) on account of their brush-like shape. In earthbound molluscs this breath organ is decreased, yet at the same time breath happens in the pallial cavity.

Molluscs, with the exception of the most highly developed cephalopods, have no brain in the strict sense of the word. Instead, the cell bodies (pericarya) of nerve cells are concentrated in nerve knots (ganglia) in important parts of the body. … In gastropods, the ganglia originally have been dispersed over the body.

Trochophore, also called trochosphere, small, translucent, free-swimming larva characteristic of marine annelids and most groups of mollusks. … In some mollusks (such as gastropods and bivalves), the trochophore develops into a second stage, the veliger (q.v.), before metamorphosing to adult form.

Do cephalopods go through larval stages?

Cephalopods have a different development to other molluscs and hatch as modified miniature adults called larvae, juveniles or, in some octopuses, paralarvae.

What are the four parts of the mollusk body?

The four important body parts in the mollusk could be listed as: Shell, Mantle, Visceral Mass and Foot.

The longest living mammal is the bowhead whale, which can live up to 200 years. Also known as the Arctic whale, this animal is big, and lives in cold waters so its metabolism is slow. The record age for a bowhead is 211 years.


What are the larval stages of Mollusca?

4.10.1. Larval Forms in Mollusca
  • Trochophore.
  • Veliger.
  • Glochidium.

Do mollusks go through metamorphosis?

The mussel life cycle is also similar to that of the clam. A fertilized egg develops within the clam’s shell. When the eggs hatch, larvae emerge from the adult and fall to the bottom of the water to wait for an opportunity to attach to a host, most often a fish. The tissue of the host forms a cyst over the larva.

What is the method of reproduction of mollusks?

and potential adult tissues undergo re- newed growth and differentiation. Molluscan species which have free- swimming larval stages show varying de- grees of cataclysmic metamorphosis.

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