Which group has a veliger larval form?

The veliger is the characteristic larva of the gastropod, bivalve and scaphopod taxonomic classes.

What is a trochophore and veliger larvae?

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 are the larval types for the molluscs?

Mollusc Larva

• Protista.
• Ciliates.
• Microalga.
• Larva.
• Trochophore.
• Fungus.
• Invertebrate.
• Metamorphosis.

Which group of organisms have both a trochophore and veliger stage?

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 is a veliger stage of some molluscs?

Ans: Veliger is the second stage larva of certain mollusks such as marine snails and bivalves and a few freshwater bivalves. The velum is used for feeding, swimming, and gas exchange and it is absorbed or lost at its adult stage as the mollusk metamorphoses.

What is the larval form of Arthropoda?

Selected types of larvae

Animal	Name of larvae
Arthropoda: Xiphosura	euproöps larva (“trilobite larva”)
Arthropoda: Pycnogonida	protonymphon
Crustaceans	General: nauplius, metanauplius, protozoea, antizoea, pseudozoea, zoea, postlarva, cypris, primary larva, mysis Decapoda: zoea Rhizocephala: kentrogon

What is meant by trochophore larva?

Definition of trochophore : a free-swimming ciliate larva occurring in several invertebrate groups (such as the polychaete worms and mollusks)

What is the function of trochophore?

trochophore, also called trochosphere, small, translucent, free-swimming larva characteristic of marine annelids and most groups of mollusks. Trochophores are spherical or pear-shaped and are girdled by a ring of cilia (minute hairlike structures), the prototroch, that enables them to swim.

What are the 6 molluscs?

Class Gastropoda – snails, slugs, limpets, whelks, conchs, periwinkles, etc.

Which classes of molluscs have trochophore and veliger larval stages?

In some mollusks (such as gastropods and bivalves), the trochophore develops into a second stage, the veliger (q.v.), before metamorphosing to adult form. Rotifers and the larvae (sometimes considered trochophores) of such invertebrates as phoronids and bryozoans are trochophore-like in appearance.

What animals have trochophore larvae?

Trochophore larva is a small, translucent, free-swimming larva characteristic of marine annelids and most groups of mollusks.

What is a Pediveliger larvae?

The veliger larvae finally develop into pediveliger larvae which have a well-developed foot and eye spots that allow the larvae to find an appropriate place to settle out as spat – newly attached juvenile oysters. Depending upon conditions, it takes from 1-3 years for spat to grow into adult oysters.

In which phylum is the larval trochophore found?

phylum annelida
Trochophore larva occurs in phylum annelida.

What are larvae called?

The larval forms of the various insects are called caterpillars, grubs, maggots, and nymphs. Echinoderms (e.g., starfish) also have larval forms. The larva of the frog is called a tadpole.

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. The antennae are used for swimming.

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’.

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 the role of trochophore larvae?

Many workers are of the opinion that the Trochophore larva serves as a bridge between radial and bilateral symmetry. They have opined that the bilateral symmetry has evolved from the radial one.

What are the 4 major molluscs?

The four major groups of mollusks (phyla Mollusca) are: 1) chitons; 2) gastropods, including snails, slugs (mostly marine, but some freshwater), and nudibranches.

What are 5 examples of molluscs?

clams, mussels, oysters, and scallops (class Bivalvia)

• ark shell (family Arcidae)
• cockles (family Cardiidae)
• coquina clam (genus Donax)
• gaper clams (Tresus nuttallii and Tresus capax)
• geoduck (Panopea generosa)
• jingle shells (family Anomiidae)
• mussels (families Mytilidae and Unionidae)
• genus Nuculana.