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What is a mollusk larvae 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).
What is the larval stage of a mollusk called?
trochophore larva
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.
Which larvae is found in Mollusca?
Trochophore larva is the larva found in mollusca and annelids.
What are the larval stages of most Mollusca?
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 are the 3 main mollusk larval stages?
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 are juvenile mollusks called?
Many mollusks develop into free-swimming larvae; these larvae are either feeding (planktotrophic) or nonfeeding (lecithotrophic). The test in other lecithotrophic larvae is restricted to a preoral girdle of ciliated cells (the prototrochus) and is called the trochophore larva.
What are clam larvae called?
A prodissoconch (meaning first or earliest or original shell) is an embryonic or larval shell which is present in the larva of a bivalve mollusk (clams, scallops, oysters, etc.).
What kind of larvae do gastropod molluscs have?
The veliger is the characteristic larva of the gastropod, bivalve and scaphopod taxonomic classes. It is produced following either the embryonic or trochophore larval stage of development.
Do molluscs have larvae?
Like many invertebrates, the mollusk life cycle includes one or more juvenile or larval stages that are very different from the adult form of the animal. Both mollusks and annelids develop through a larval stage called a trochophore larva.
When present a crustacean larva is called?
Mysis or Schizopod Larva: Mysis or schizopod larva resembles an adult Mysis. Head and thorax have a carapace, all cephalic and thoracic appendages are present, but all thoracic appendages are alike and biramous with exopodites, abdomen has five pairs of pleopods and the sixth form uropods.
What is the name of the larval stage of porifera?
The common larval stages found in sponges are Amphiblastula (found in scypha) and parenchymula (found in leucosolenia).
Is an octopus a mollusk?
octopus, plural octopuses or octopi, in general, any eight-armed cephalopod (octopod) mollusk of the order Octopoda. The true octopuses are members of the genus Octopus, a large group of widely distributed shallow-water cephalopods.
Which is the second larval stage of a mollusk?
The second larval stage of many mollusks; has large, ciliated lobes and the beginnings of a foot, shell, and mantle Chitons Animals found on rocky marine shorelines with 8 overlapping plates on their dorsal surface
What do mollusks look like in the ocean?
Most mollusks have at least two stages of life and their second stage (or adult phase) is often marked by bearing a shell. Polyplacophora are more commonly referred to as chitons. They look ancient, like a trilobite of the ocean. Their body is an elongated dome with eight overlapping plates and they are usually as big as a quarter.
Where did the name Mollusca come from and why?
The name “mollusca” signifies a soft body, since the earliest descriptions of mollusks came from observations of unshelled cuttlefish. Mollusks are predominantly a marine group of animals; however, they are known to inhabit freshwater as well as terrestrial habitats.
Are there any mollusks that don’t have shells?
Mollusks without shells include squid, banana slugs, and octopi. Some mollusks are terrestrial, occurring in most environments on earth, while others live in the water for some or all of their life. Many of the most popular mollusks are marine species because they are pretty and some are caught for food or jewelry.