Larva

A larva (plural larvae /ˈlɑːrviː/) is a distinct juvenile form many animals undergo before metamorphosis into adults. Animals with indirect development such as insects, amphibians, or cnidarians typically have a larval phase of their life cycle.

The larva's appearance is generally very different from the adult form (e.g. caterpillars and butterflies). A larva often has unique structures and organs that do not occur in the adult form, while their diet might be considerably different.

Larvae are frequently adapted to environments separate from adults. For example, some larvae such as tadpoles live almost exclusively in aquatic environments, but can live outside water as adult frogs. By living in a distinct environment, larvae may be given shelter from predators and reduce competition for resources with the adult population.

Animals in the larval stage will consume food to fuel their transition into the adult form. In some species like barnacles, adults are immobile but their larvae are mobile, and use their mobile larval form to distribute themselves.

Lemures

In Roman mythology, the lemures /ˈlɛmjəriːz/ were shades or spirits of the restless or malignant dead, and are probably cognate with an extended sense of larvae /ˈlɑːrviː/ (from Latin larva, "mask") as disturbing or frightening. Lemures is the more common literary term but even this is rare: it is used by the Augustan poets Horace and Ovid, the latter in his Fasti, the six-book calendar poem on Roman holidays and religious customs.

The word lemures can be traced to the PIE stem *lem-, which also appears in the name of the Greek monster Lamia.

Description

Lemures may represent the wandering and vengeful spirits of those not afforded proper burial, funeral rites or affectionate cult by the living: they are not attested by tomb or votive inscriptions. Ovid interprets them as vagrant, unsatiated and potentially vengeful di manes or di parentes, ancestral gods or spirits of the underworld. To him, the rites of their cult suggest an incomprehensibly archaic, quasi-magical and probably very ancient rural tradition. Four centuries later, St. Augustine describes both the lemures and the larvae as evil and restless manes that torment and terrify the living: lares, on the other hand, are good manes.