Larva

larvaelarvalgrubsgrublarval stageinsect larvaelarval formlarval stagesbeetle grubcaterpillars
A larva (plural larvae ) is a distinct juvenile form many animals undergo before metamorphosis into adults.wikipedia
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Amphibian

Amphibiaamphibiansamphibious
Animals with indirect development such as insects, amphibians, or cnidarians typically have a larval phase of their life cycle.
Thus amphibians typically start out as larvae living in water, but some species have developed behavioural adaptations to bypass this.

Caterpillar

caterpillarslarvaelarva
The larva's appearance is generally very different from the adult form (e.g. caterpillars and butterflies) including different unique structures and organs that do not occur in the adult form.
Caterpillars are the larval stage of members of the order Lepidoptera (the insect order comprising butterflies and moths).

Butterfly

butterfliesRhopalocerabutterfly-like
The larva's appearance is generally very different from the adult form (e.g. caterpillars and butterflies) including different unique structures and organs that do not occur in the adult form.
Winged adults lay eggs on the food plant on which their larvae, known as caterpillars, will feed.

Tadpole

tadpolesPollywogpolliwog
For example, some larvae such as tadpoles live almost exclusively in aquatic environments, but can live outside water as adult frogs.
A tadpole (also called a pollywog) is the larval stage in the life cycle of an amphibian, particularly that of a frog or toad.

Frog

frogsAnuraanuran
For example, some larvae such as tadpoles live almost exclusively in aquatic environments, but can live outside water as adult frogs.
The eggs hatch into aquatic larvae called tadpoles that have tails and internal gills.

Newt

newtsEftPleurodelinae
The larvae of some species (for example, some newts) can become pubescent and do not develop further into the adult form.
Newts metamorphose through three distinct developmental life stages: aquatic larva, terrestrial juvenile (eft), and adult.

Neoteny

neotenicpaedomorphicpaedomorphosis
This is a type of neoteny.
Some authors define paedomorphism as the retention of larval traits, as seen in salamanders.

Metamorphosis

metamorphosemetamorphosedmetamorphosing
A larva (plural larvae ) is a distinct juvenile form many animals undergo before metamorphosis into adults.
While ametabolous insects show very little difference between larval and adult forms (also known as "direct development"), both hemimetabolous and holometabolous insects have significant morphological and behavioral differences between larval and adult forms, the most significant being the inclusion, in holometabolus organisms, of a pupal or resting stage between the larval and adult forms.

Nematocera

flies such as the mosquitoesmosquitoMosquitoes, midges, and gnats
The Nematocera (the name means "thread-horns") are a suborder of elongated flies with thin, segmented antennae and mostly aquatic larvae.

Animal

Animaliaanimalsmetazoa
A larva (plural larvae ) is a distinct juvenile form many animals undergo before metamorphosis into adults.
Many bilaterian phyla have primary larvae which swim with cilia and have an apical organ containing sensory cells.

Endopterygota

Holometabolaendopterygoteholometabolous
Endopterygota (from Ancient Greek endon “inner” + pterón, “wing” + New Latin -ota “having”), also known as Holometabola, is a superorder of insects within the infraclass Neoptera that go through distinctive larval, pupal, and adult stages.

Crane fly

Tipulidaecraneflycrane flies
The larvae of crane flies are known commonly as leatherjackets.

Buprestidae

metallic wood-boring beetlejewel beetlebuprestid
The larvae bore through roots, logs, stems, and leaves of various types of plants, ranging from trees to grasses.

Longhorn beetle

Cerambycidaelong-horned beetlelonghorn beetles
The larvae, called roundheaded borers, bore into wood, where they can cause extensive damage to either living trees or untreated lumber (or, occasionally, to wood in buildings; the old-house borer, Hylotrupes bajulus, is a particular problem indoors).

Crustacean larva

larvaezoeanauplius
The larvae of crustaceans often bear little resemblance to the adult, and there are still cases where it is not known what larvae will grow into what adults.

Ichthyoplankton

larvaefish larvaefish larva
Ichthyoplankton (from Greek: ἰχθύς, "fish"; and πλαγκτός,, "drifter" ) are the eggs and larvae of fish.

Spawn (biology)

spawningspawnspawns
There the larvae develop as they consume their fat stores, and eventually hatch from the egg capsule into miniature versions of their parents.

Sponge

spongessea spongePorifera
The fertilized eggs develop into larvae, which swim off in search of places to settle.

Mollusca

molluskmolluscmolluscs
All produce eggs, from which may emerge trochophore larvae, more complex veliger larvae, or miniature adults.

Bryozoa

bryozoanbryozoansEctoprocta
In some species the larvae have large yolks, go to feed, and quickly settle on a surface.

Insect

Insectainsectsbugs
Animals with indirect development such as insects, amphibians, or cnidarians typically have a larval phase of their life cycle.
Many insects spend at least part of their lives under water, with larval adaptations that include gills, and some adult insects are aquatic and have adaptations for swimming.

Juvenile (organism)

juvenilejuvenilessubadult
Their juveniles are larvae or nymphs.

Polyp (zoology)

polyppolypscoral polyp
In those scyphozoans that have the larval planula metamorphose into a polyp, the polyp, also called a "scyphistoma," grows until it develops a stack of plate-like medusae that pinch off and swim away in a process known as strobilation.

Jellyfish

medusamedusaejelly fish
The planula is a small larva covered with cilia.

Nymph (biology)

nymphsnymphnymphal
Unlike a typical larva, a nymph's overall form already resembles that of the adult, except for a lack of wings (in winged species).