Letoia can refer to:
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As a Given Name: A feminine given name primarily of Latvian origin. While not among the most common names, it is recognized within Latvian culture. Its etymology is sometimes associated with ancient Baltic linguistic roots or mythological figures, though direct links can vary.
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In Biology: A genus of moths belonging to the family Limacodidae, commonly known as slug moths or cup moths. Species within the genus Letoia share the characteristic features of their family, notably their larvae. These caterpillars are distinctively slug-like in appearance, lacking typical prolegs and instead moving with a gliding motion. Many limacodid larvae, including some in the genus Letoia, possess urticating hairs or spines that can cause irritation upon contact. The genus was first described by Francis Walker in 1862. Letoia species are found in various parts of the world, often in tropical and subtropical regions. An example species within this genus is Letoia funebris.