Do mollusks have 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 molluscs have trochophore larva?

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.

What phylum are trochophore larvae?

phylum annelida
They are triploblastic, bilaterally symmetrical and segmented Metazoa. Some of the annelids belong to the Lophotrochozoa lineage. Trochophore larva occurs in phylum annelida.

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.

Which class of mollusks contain octopi and squids?

Cephalopods
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).

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.

Is Cnidaria a Lophotrochozoa?

The Cnidarians (jellyfish and their relatives) represent the basal animals. The Lophotrochozoans (Phyla Platyhelminthes, Mollusca, Annelida and Rotifera) represent one of the major groups of invertebrates outside of the arthropoda.

Are octopi and squids related?

You wouldn’t be alone if you thought the octopus and squid were the same animals. They are cousins—both part of the group cephalopoda—a group of marine mollusks that include squid, octopus, nautilus, and snails. There are nearly 300 species of squids and 300 species of octopus in the global ocean.

What is a trochophore in mollusks?

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 is a metatrochophore larva?

A metatrochophore ( / ˌmiːtəˈtroʊkəˌfɔːr, ˌmɛ -, – ˈtrɒ -, – koʊ -/;) is a type of larva developed from the trochophore larva of a polychaete annelid . Metatrochophores have a number of features trochophores lack, including eyespots and segments .

What do trochophore larvae eat?

In some other groups (e.g., Sipunculans, nereids and eunicids of polychaetes), the trochophore larvae are lecithotrophic larvae. They do not take any food from external sources and mainly feed upon the yolk originally laid down in the egg. The lecithotrophic larvae lead a short planktonic life.

Who discovered trochophore larva?

Loven (1840), a Swedish naturalist, was the first man who discovered trochophore larva. Since then the larva was known as Loven’s larva. 2. Semper (1859) used the name Trochosphaera, a rotifer for the organ­ism. 3.