What is a trochophore larva?
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 is the evolutionary significance of trochophore larva?
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 is the trochophore function?
A trochophore (/ˈtroʊkəˌfɔːr, ˈtrɒ-, -koʊ-/; also spelled trocophore) is a type of free-swimming planktonic marine larva with several bands of cilia. By moving their cilia rapidly, they make a water eddy, to control their movement, and to bring their food closer, to capture it more easily.
What is trochophore 11?
Trochophores are spherical or pear-shaped and are girdled by a ring of cilia the prototroch, that enables them to swim. In some mollusks (such as gastropods and bivalves), the trochophore develops into a second stage, the veliger, before metamorphosing to an adult form. Hence, option A is the correct answer.
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 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.
Is the trochophore larvae a feeding life stage?
Within 5 to 10 hours after fertilization, the oyster egg develops into a swimming, nonfeeding, trochophore larva, which 48 hours after fertilization develops into a planktotrophic, straight-hinge, veliger larva (Galtsoff, 1964). These changes take place during a 24-hour period during which the larva cannot feed.
What are two functions of the cilia in a trochophore?
The cilia on a trochophore are moved rapidly in order to create a water eddy, thus controlling the direction of their movement. List the main parts in the basic body plan of a mollusk. the four main parts of a mollusk are the head, the foot, the visceral mass and the shell it resides in.
Do sponges have trochophore larvae?
They account for 95% of known animal species. Lophotrochozoan- have a lophophore (a crown of cilia that surrounds the mouth) or a trochophore (larvae that have cilia around their middle). Porifera- Sponges are basal animals that lack true tissues.
Do cephalopod mollusks have a trochophore stage?
Question: Do cephalopod mollusks have a trochophore stage? Yes No Depends. Some cephalopods have a trochophore stage, others do not. Select all the feature(s) that at least some representatives of the mollusk classes Polyplacophora, Gastropoda, Bivalvia, and Cephalopoda share with each other.