All crustaceans have a distinctive larval form called the nauplius. The nauplius stage is characterized by the development and usage of appendages and antennae.
nauplius
Crustaceans differ from other arthropods in that they have biramous (two-part) appendages and the nauplius larval form.
Tadpole.
The Taenia solium, which is a Cestode, has a larval form (cysticercus) that is commonly referred to as a bladder worm.
tapeworm
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.
A change from a larval form to an adult form is known as metamorphosis. Butterflies and frogs are prime examples of this.
trochophore
Amphibians
The adjective form is larval. Example sentence: A caterpillar is the larval stage of butterflies and moths.
The noun form for the adjective distinctive is distinctiveness.
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
The correct spelling of the larval form is a caterpillar.