What is lecithotrophic larvae?
Many fish species and some benthic invertebrates have lecithotrophic larvae, which have yolk droplets or a yolk sac for nutrition during dispersal. Though some lecithotrophic species can feed in the water column, too. But many, such as tunicates, cannot, and so must settle before depleting their yolk.
What is planktotrophy?
Planktotrophy, meaning “feeding on plankton” refers to development via a larva that must feed in the plankton in order to develop to metamorphosis. Species with planktotrophic development produce many small energy-poor eggs with adequate nutrient reserves for the development of a feeding larva.
What is larval biology?
larva, plural larvae, or larvas, stage in the development of many animals, occurring after birth or hatching and before the adult form is reached. These immature, active forms are structurally different from the adults and are adapted to a different environment.
What are the special advantages of having an aquatic larval stage in the life cycle?
The presumed advantages of such larvae include the avoidance of competition for resources with adults, temporary reduction of benthic mortality while in the plankton, decreased Likelihood of inbreeding in the next generation, and increased ability to withstand local extinction.
What does Lecithotrophic mean?
A form of development in which the embryo receives no nutrition other than the yolk originally contained within its egg.
What is Lecithotrophic Viviparity?
Viviparity can be either lecithotrophic (embryos develop without any specialized vascular exchange organ and rely solely on the yolk sac for nutrition) or matrotrophic (where the nutrients are provided by the mother during the gestation in a variety of ways, including through a placental structure or not).
What is planktonic larva?
Planktonic larval stage in life gives species a way to disperse. The larvae develop while adrift at sea, often going through many stages before reaching adult body form. Looking like something out of a Dr. Seuss book, the larvae often don’t resemble their adult form.
What are the 5 types of insect larvae with example?
Selected types of larvae
| Animal | Name of larvae |
|---|---|
| Crustaceans | General: nauplius, metanauplius, protozoea, antizoea, pseudozoea, zoea, postlarva, cypris, primary larva, mysis Decapoda: zoea Rhizocephala: kentrogon |
| Insecta: Lepidoptera (butterflies and moths) | caterpillar |
| Insecta: Beetles | grub |
| Insecta: Flies, Bees, Wasps | maggot |
Is a caterpillar a larva?
Caterpillar: The Feeding Stage
The next stage is the larva. This is also called a caterpillar if the insect is a butterfly or a moth. The job of the caterpillar is to eat and eat and eat.
What insects live in water larvae?
Dragonflies, mosquitoes, midges, mayflies and many more insects live in the water during their immature life stage (nymphs and larvae) and fly on land in their adult life stage. You can think of the immature life stage and adult life stage as the equivalent of a caterpillar and butterfly.
What are five types of larvae?
Is Monkey oviparous or viviparous?
Mammals such as cows, monkeys, chimpanzees are viviparous.
What are the 3 types of plankton?
The three most important types of phytoplankton are:
- Diatoms. These consist of single cells enclosed in silica (glass) cases.
- Dinoflagellates. This name refers to two whip-like attachments (flagella) used for forward movement.
- Desmids. These freshwater photosynthesisers are closely related to green seaweeds.
Is a jellyfish a plankton?
Plankton are usually microscopic, often less than one inch in length, but they also include larger species like some crustaceans and jellyfish. Scientists classify plankton in several ways, including by size, type, and how long they spend drifting.
What is an example of a larva?
The immature form of many insects and amphibians is a larva. A caterpillar is one example of a larva — it has hatched from an egg and will eventually become a fully mature butterfly.
What are the two types of larvae?
TYPES OF LARVAE: There are three main types of insect larvae namely oligopod, polypod and apodous.
- OLIGOPOD : Thoracic legs are well developed.
- POLYPOD or ERUCIFORM : The body consists of an elongate trunk with large sclerotised head capsule.
- APODOUS: They are larvae without appendages for locomotion.
Do caterpillars have 12 eyes?
The majority of caterpillars have twelve eyes, six on either side of their head. A few species have between ten and fourteen eyes instead. These species are largely more primitive forms, which also have other features that mark them out from other moths and butterflies.
What is butterfly larva called?
Butterfly larvae—more commonly known as caterpillars—are more charismatic than most of their cohorts. Caterpillars are notoriously voracious, consuming grass, leaves, and other plant material as they grow up to 1,000 times their original birth weight.
What insect lays eggs in water?
Mosquitoes
Mosquitoes lay their eggs in stagnant water near ponds, lakes and rivers, or wherever rainwater has collected, such as clogged gutters, old tires and areas with inadequate drainage.
Which insect is clean water?
The Anopheles mosquito prefers breeding in clean, unpolluted water. Its larva floats horizontally, parallel to the water surface. The Culex mosquito can breed in various kinds of stagnant water.
Is a larva a worm?
Of course, many insect larvae have common names such as inchworm, glowworm, mealworm and bloodworm, but that does not mean they are really worms. Wormlike insect larvae include caterpillars, grubs and maggots. Caterpillars are the larvae of butterflies and moths.
Are frogs viviparous?
Among frogs and toads, the majority are oviparous, some are ovoviviparous (lecithotrophic mode of viviparity: growing embryos and larvae feed exclusively upon the yolk contained in the egg, which is retained within the oviduct or in some ‘ectopic site’ such as the vocal sac or a specialized venue inside the stomach).
Is Pig a viviparous?
Viviparous animals are born as live young individuals. Mammals such as cows, horses, dogs, pigs, dolphins are viviparous. Humans are also viviparous. Our beautiful set includes: 14 animals, 18 laminated cards, and 2 clear plastic boxes.
Is plankton a fish?
Phytoplankton are microscopic plants, but they play a huge role in the marine food web. Like plants on land, phytoplankton perform photosynthesis to convert the sun’s rays into energy to support them, and they take in carbon dioxide and produce oxygen.
Is algae a plankton?
The term plankton is a collective name for all such organisms—including certain algae, bacteria, protozoans, crustaceans, mollusks, and coelenterates, as well as representatives from almost every other phylum of animals.