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All crustaceans have a distinctive larval form called the nauplius. The nauplius stage is characterized by the development and usage of appendages and antennae.
Crustaceans differ from other arthropods in that they have biramous (two-part) appendages and the nauplius larval form.
A change from a larval form to an adult form is known as metamorphosis. Butterflies and frogs are prime examples of this.
trochophore
the process of transformation from an immature form to an adult form in two or more distinct stages."the persistence of the larval tail during metamorphosis"
Arachnids differ from other arthropods in that they have no antenna (nor wings, like many insects). They also use book lungs to breathe, rather than the gills or spiracle/trachea configuration. They have a body plan of only two sections (tagmata) and eight legs, although often with a modified forward pair different from most other arthropods.
The Taenia solium, which is a Cestode, has a larval form (cysticercus) that is commonly referred to as a bladder worm.
Amphibians
The general term is pedomorphosis. The best-known form of pedomorphosis is neoteny.
Tadpole.
The adjective form is larval. Example sentence: A caterpillar is the larval stage of butterflies and moths.
Larva is an intermediate form that an organism goes through to reach adult form. EX: --> tadpoles are larval of frogs --> caterpillars are larval of butterflies or moths