The veliger is the characteristic larva of the gastropod, bivalve and scaphopod taxonomic classes. It is produced following either the embryonic or trochophore larval stage of development.

What is the larval stage of the mollusk called?

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.

Do gastropods have trochophore larva?

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.

What are the larval stages of Mollusca?

Three main larval forms are observed in molluscan forms. There are: Trochophore. Veliger.

What do gastropod larvae eat?

Gastropods and bivalves may have a planktonic veliger larva which commonly feeds on plankton (planktotrophic). Cephalopods lack a true larval stage and have a yolk-rich early ontogenetic development.

What is a Veliger

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What is crustacean larva called?

In all Crustaceans the nauplius is the first larval stage of development. But its appearance-varies in different forms. In Cladocera, nauplius stage appears inside the egg. In Ostracoda nauplius, pair of bivalved shells and uniramous appendages is present.

What is the larval form of echinoderms known as?

➢ 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 the name of the larval stage of porifera?

The common larval stages found in sponges are Amphiblastula (found in scypha) and parenchymula (found in leucosolenia).

What is the first larval stage of fasciola?

[Miracidium larva comes out from the egg shell of the fertilized egg by eroding tlie operculum wit11 the help of proteolytic enzyme. It is the first larval stage in the life cycle of F. hepatica. It is a free swimming stage in fresh water.

What is the larval form of Hemichordata?

A tornaria is the planktonic larva of some species of Hemichordata such as the acorn worms.

In which phylum is the larva trochophore found?

Trochophore larva occurs in phylum annelida.

What is Glochidium larva?

The glochidium (plural glochidia) is a microscopic larval stage of some freshwater mussels, aquatic bivalve mollusks in the families Unionidae and Margaritiferidae, the river mussels and European freshwater pearl mussels.

What kind of larvae do gastropod molluscs have?

The veliger is the characteristic larva of the gastropod, bivalve and scaphopod taxonomic classes. It is produced following either the embryonic or trochophore larval stage of development.

What are the 3 main mollusk larval stages?

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.

Do molluscs have a larval stage?

Unlike echinoderms, molluscs do not have a larval body separate from the juvenile/adult body; mollus- can larvae have only transient larval traits.

What are the two distinct larval stages of molluscs called?

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.

What are the different larval forms of Fasciola?

Larval Stages:

• Miracidium Larva: It is the first larval stage in the life cycle of Fasciola hepatica. ...
• Sporocyst Larva: Miracidium loses its apical gland, penetration grand, brain and eyespots and changes into a saclike sporocyst larva. ...
• Redia Larva: ...
• Cercaria Larva: ...
• Metacercaria:

How many larval stages are found in the life cycle of Fasciola?

Parasite morphology: These flatworms form seven different developmental stages: eggs, miracidia, sporocysts, rediae, cercariae, metacercariae, and adult flukes.

What is metacercaria larva?

: a tailless encysted late larva of a digenetic trematode that is usually the form which is infective for the definitive host.

What is Amphiblastula larva?

: a free-swimming larva of certain sponges that is essentially a blastula with small flagellated cells in one hemisphere and large nonflagellated cells in the other.

What are the larval forms of asteroidea?

The earliest larval stage of Asteroidea is called an auricularia, followed by bipinnaria and brachiolaria stages. Larval development is illustrated with Asterias rubens, a common sea star in the North Sea.

Which of the following is Thesignificance of echinoderm larvae?

Larval significance

This indicates the origin of all groups from a common ancestor which is bilaterally symmetrical and free swimming. The auricularia larva closely resembles the tornaria larva of balanoglossus. This indicates the close relationship between the echinodermata and chordata.

Which of the following is the larva of echinoderm animals *?

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.

How many larval form are in crustaceans?

This has resulted in development in decapod crustaceans being generally abbreviated. There are at most nine larval stages in decapods, as in krill, and both decapod nauplii and krill nauplii often lack mouthparts and survive on nutrients supplied in the egg yolk (lecithotrophy).

Which is the first larval form of Branchiopoda?

A typical branchiopod begins its life cycle as a nauplius larva, which has a simple undivided triangular body and three pairs of appendages: antennules, antennae, and mandibles.