What is the second larval stage of bivalves?

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.

1. What is the life cycle of a bivalve?
2. What is the larvae of bivalve?
3. What is the larval stage of mollusks called?
4. How do bivalves reproduce?
5. What type of fertilization is predominant in bivalves?
6. What is the larval stage of echinoderms?
7. What are the 5 groups of bivalves?
8. What are the 4 types of bivalves?
9. What are two methods of propulsion or movement for bivalves?
10. Which two structures are missing in bivalves but are present in all other mollusks?
11. Do mollusks have a larval stage?
12. What is trochophore larval stage?
13. Do cephalopods have larval stage?

What is the life cycle of a bivalve?

The life cycles of bivalves include metamorphosis in the majority of cases, involving larval, juvenile, and adult stages.

What is the larvae of bivalve?

The veliger is the characteristic larva of the gastropod, bivalve and scaphopod taxonomic classes. ... In bivalves the veliger is sometimes referred to as a D-stage (early in its development) or pediveliger (late in its development) larva.

What is the larval stage of mollusks 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.

How do bivalves reproduce?

Marine bivalves reproduce by releasing prodigious numbers of eggs and sperm into the water, where external fertilization occurs. The fertilized eggs then float in the surface plankton. Within 48 hours after fertilization, the embryo develops into a minute, planktonic, trochophore larvae.

What type of fertilization is predominant in bivalves?

Bivalves with external fertilization are generally medium to large, which allows a large production of gametes that guarantee a high fertilization rate.

What is the larval stage of echinoderms?

Class Holothuroidea demonstrate two larval stages, namely, auricularia and doliolaria larvae. ➢ Auricularia larva has striking resemblance with bipinnaria of Asteroidea as it also possesses 4 or 5 pairs of ciliated arms for swimming and has a well- developed mouth, gut and anus.

What are the 5 groups of bivalves?

Bivalves as a group have no head and they lack some usual molluscan organs like the radula and the odontophore. They include the clams, oysters, cockles, mussels, scallops, and numerous other families that live in saltwater, as well as a number of families that live in freshwater. The majority are filter feeders.

What are the 4 types of bivalves?

Bivalves include clams, scallops, oysters, and mussels. As their name implies, they have two parts of their shell, which can open and close.

What are two methods of propulsion or movement for bivalves?

Some use the muscular foot to move, either through the sediment or even by waving the foot. Tentacles may be used for movement. There are even some bivalves, such as the scallops, that can "swim" by jet-propelling themselves through the water by opening the valves and then rapidly snapping them shut.

Which two structures are missing in bivalves but are present in all other mollusks?

In keeping with a largely sedentary and deposit-feeding or suspension-feeding lifestyle, bivalves have lost the head and the radular rasping organ typical of most mollusks.

Do mollusks 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 is trochophore larval stage?

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 cephalopods have larval stage?

Cephalopods have a different development to other molluscs and hatch as modified miniature adults called larvae, juveniles or, in some octopuses, paralarvae (Young and Harman 1988).