Trochophore larva occurs in phylum annelida.
Also 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.
Likewise What do you mean by 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 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.
What is the significance of trochophore larva?
Trochophore larva has a prominent status in the evolutionary context. Studies are suggestive of the Trochophore larva as a bridge between radial and bilateral symmetry. The larval form shows similarities with many invertebrate groups.
What is the evolutionary importance of Trochophores? 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.
Is porifera a trochophore? Invertebrates- are animals that lack a backbone. 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.
What is the larva of Arthropoda? This larval stage, called a nauplius, is found in barnacles, copepods, penaeid shrimps, and ostracods. It swims by using its jointed appendages that are moved by muscle contraction. These larvae have a nauplier eye, made up of photoreceptor cells that are thought to give rise to the photoreceptors in some adult forms.
What is the difference between trochophore and Veliger larvae?
Unlike the trochophore, the newly hatched veliger may have or will develop many of the characteristic features of the adult including such structures as a muscular foot, eyes, rhinophores, a fully developed mouth, and a spiral shell (in fact, the veliger of nudibranchs has a shell, although the adult does not).
What is the study of Malacology? Malacology is the study of mollusks (snails, clams, octopods, etc.).
What is the difference between trochophore and veliger larvae?
Unlike the trochophore, the newly hatched veliger may have or will develop many of the characteristic features of the adult including such structures as a muscular foot, eyes, rhinophores, a fully developed mouth, and a spiral shell (in fact, the veliger of nudibranchs has a shell, although the adult does not).
Do all mollusks have trochophore larvae? Molluscs include such familiar creatures as clams, oysters, snails, and octopi. They share a distant common ancestor with the annelid worms, an evolutionary heritage suggested by their larval form, called a trochophore larva, found in all molluscs and in certain marine annelids called polychaete worms.
Do arthropods have trochophore larvae?
Trochophore larvae are characterized by two bands of cilia around the body. Previously, these were treated together as the Trochozoa, together with the arthropods, which do not produce trochophore larvae, but were considered close relatives of the annelids because they are both segmented.
Which of the following is molluscan larva?
Explanation: 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).
What is torsion in molluscs? Torsion is the rotation of visceral mass, mantle, and shell 180˚ with respect to the head and foot of the gastropod. This rotation brings the mantle cavity and the anus to an anterior position above the head.
Do platyhelminthes have a Lophophore? Phylum Platyhelminthes. … The flatworms possess neither a lophophore nor trochophore larvae, although the larvae of one group of flatworms, the Polycladida (named after its many-branched digestive tract), are considered to be homologous to trochophore larvae.
Are platyhelminthes sessile?
Why does a sessile animal need a motile larval stage? Phylum Platyhelminthes – flatworms, flukes and tapeworms; 18,500 sp. … Because they are so flat, diffusion is sufficient for respiration, and flatworms lack respiratory and circulatory systems.
Is Ecdysozoa a cnidaria? Lophotrochozoa and Ecdysozoa are both Bilataria. Acoela and Cnidaria both possess radial symmetry. Arthropods are more closely related to nematodes than they are to annelids.
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 larva of Mollusca? 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).
What is the larval stage called?
The larva, often referred to as a nymph, has more or less the same organization as the adult, or imago; it feeds in a similar way but differs from the adults in lacking wings and in having incomplete sex organs.
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.
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