What is trochophore larvae?
What is trochophore larvae?
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.
Which larvae is found in Mollusca?
Trochophore larva is the larva found in mollusca and annelids.
What is the difference between a trochophore larva and a Veliger larva?
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 first larval stage of mollusks?
trochophore larva
Both mollusks and annelids develop through a larval stage called a trochophore larva.
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 Cydippid larva?
cydippid larva A free-swimming, larval stage of a ctenophorid (Ctenophora) which resembles adults of the order Cydippidea. A Dictionary of Zoology.
What do mollusc larvae eat?
The most basic molluscan larva is a trochophore, which is planktonic and feeds on floating food particles by using the two bands of cilia around its “equator” to sweep food into the mouth, which uses more cilia to drive them into the stomach, which uses further cilia to expel undigested remains through the anus.
What is the Tornaria larva?
A tornaria is the planktonic larva of some species of Hemichordata such as the acorn worms. It is very similar in appearance to the bipinnaria larvae of starfishes, with convoluted bands of cilia running around the body. It is an oval shaped, transparent larva.
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.
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.
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.
Do molluscs 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 happens to the larva of a moth before it pupates?
As they grow, these larvae change in appearance, going through a series of stages called instars. Once fully matured, the larva develops into a pupa. A few butterflies and many moth species spin a silk case or cocoon prior to pupating, while others do not, instead going underground.
How do you identify geometer moth caterpillars?
Geometer moths may be easiest to identify in the larval stage, thanks to their unusual appearance. The caterpillars bear just two or three pairs of prolegs near their hind ends, instead of the five pairs found in most butterfly or moth larvae.
What are clothes moth larvae?
Moth Larvae are the actual pest that causes the damage to clothing and precious home textiles, not the adult Clothes Moths, Carpet Moths or Pantry Moths you can see flying around in season. How to get rid of clothes moth larvae involves far more intensive investigation, cleaning and treatment than many people realise.
What is the life cycle of a geometrid moth?
Some cause significant forest defoliation. All geometer moths undergo complete metamorphosis with four life stages: egg, larva, pupa, and adult. Geometrid eggs can be laid singly or in groups, varying according to species. Most geometer moths overwinter in the pupal stage, though some do so as eggs or caterpillars.
