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.
One distinguishing characteristic of the members of the genus Ambystoma is their larval form, as they typically have external gills and a distinct aquatic lifestyle before transitioning to their adult form. They also exhibit a diverse range of behaviors and life history strategies, such as paedomorphosis, where some individuals retain their larval features into adulthood.
Amphibians
Tadpole.
A cypris is a larval stage in the life cycle of some crustaceans, like barnacles. They are usually free-swimming and use their appendages to propel themselves through the water in search of a suitable substrate to settle and undergo metamorphosis into the adult form.
The adjective form is larval. Example sentence: A caterpillar is the larval stage of butterflies and moths.