What is the larval stage of mollusks and annelids?
What is the larval stage of mollusks and annelids?
What is the larval stage of mollusks and annelids?
Mollusks (and annelids) have a unique larval form called a trochophore.
What is the larval stage of a mollusk called?
Veliger
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). The velum forms from the ciliary ring (prototroch), a characteristic of the trochophore stage.
What is the name of Mollusca larva?
Trochophore larva is the larva found in mollusca and annelids.
What are the larval stages of most Mollusca?
In some mollusks, the zygote hatches and undergoes two larval stages—trochophore and veliger—before becoming a young adult; bivalves may exhibit a third larval stage, glochidia.
Is Mollusca a Trochophore?
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 mollusks have a true Coelom?
Both molluscs and annelids probably evolved from free-living flatworms. But molluscs have developed a true coelom, an internal body cavity enclosed by mesodermal membranes. The coelom in molluscs, however, is strangely reduced to a small space around the heart, sometimes called a hemocoel.
Do mollusks have brains?
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.
Do mollusks move?
Most mollusks move with a muscular structure called a foot. The feet of different kinds of mollusks are adapted for different uses, like crawling, digging, or catching prey.
Is Mollusca a trochophore?
Which animal group has trochophore larva?
Trochophore, also called trochosphere, small, translucent, free-swimming larva characteristic of marine annelids and most groups of mollusks.
Is squid a Mollusca?
Cephalopods are a group of molluscs that include the pearly chambered Nautilus, squids, and the octopus. They can be divided into three categories: the Nautiloidea (chambered Nautilus), the Ammonoidea (the extinct ammonites), and the Dibranchiata (squids, the extinct belemnites, and octopuses).