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.
Tadpole.
The Taenia solium, which is a Cestode, has a larval form (cysticercus) that is commonly referred to as a bladder worm.
The larval stage of mollusks is called a trochophore, which is a free-swimming, ciliated larva that eventually develops into the adult form. For annelids, the larval stage is called a trochophore or a nectochaete, which also metamorphoses into the adult form after a period of growth and development.
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 noun form for the adjective distinctive is distinctiveness.
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.
No, reptiles do not have a larval stage. Unlike some amphibians and insects, reptiles hatch from eggs in a form that resembles miniature adults. They do not undergo metamorphosis like amphibians that have larval stages such as tadpoles.