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Ctenucha rubriceps

Ctenucha rubriceps


Family: Erebidae
Order: Lepidoptera
Class: Insecta
Phylum / Division: Arthropoda
Kingdom: Animalia

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Records from General Villegas


Description


Belongs to a group of moths within the family Erebidae characterized by a striking aposematic coloration pattern that serves as a highly effective visual deterrent against potential predators. This insect displays a bright crimson-red head that contrasts sharply with the rest of its body. Its robust abdomen features brilliant iridescent metallic blue or greenish hues that shimmer intensely under direct sunlight. The forewings and hindwings are predominantly a smoky blackish-brown, occasionally exhibiting subtle blue highlights at the wing bases and very thin, pale grey or white fringes along the margins. It has a wingspan ranging from 38 to 46 millimeters. The antennae are deeply bipectinate in males, presenting a feathery appearance designed for detecting female chemical signals, while those of the females are simpler and thread-like.

Geographical distribution: Occurs widely throughout the Neotropical region, spanning a diverse geographical range. Its populations are distributed from southern Mexico down through several countries in Central America, including Guatemala, Honduras, Costa Rica, and Panama. In South America, its range extends across the Andean slopes and lowland basins, with documented records in Colombia, Venezuela, Ecuador, Peru, and northwestern Brazil, demonstrating a highly adaptable nature across various altitudinal gradients.

Habitat: Inhabits primarily humid forest ecosystems and transition zones, showing a clear preference for tropical moist forests, montane cloud forests, and rainforest edges. It is frequently observed in forest clearings, regenerating secondary growth areas, and wet grasslands located near water bodies. Its elevation range extends from sea level up to altitudes exceeding 2200 meters above sea level, where high humidity levels support the lush vegetation required by its larval stages.

Feeding: Exhibits a specialized herbivorous diet during its caterpillar stage, feeding on a wide variety of monocotyledonous plants, particularly members of the Poaceae (grasses) and Cyperaceae (sedges) families. As an adult, it actively feeds on flower nectar, showing a strong preference for plants belonging to the Asteraceae family. This nectar feeding provides the essential carbohydrates needed for flight and allows the adult to sequester toxic pyrrolizidine alkaloids, which accumulate in its tissues and render the moth unpalatable to insectivorous birds and other predators.

Behavior: Displays primarily diurnal and crepuscular habits, which is unusual for many members of its superfamily that are strictly nocturnal. It exhibits a slow, direct, and undulating flight pattern close to the vegetation, making its bright warning colors highly visible to onlookers. When threatened, it rarely resorts to rapid flight, instead relying on its aposematism to deter attackers. Additionally, it possesses specialized tympanal organs on its metathorax that can detect the echolocation calls of insectivorous bats, allowing it to perform evasive maneuvers or drop to the ground if active during twilight hours.

Reproduction: Initiates its reproductive cycle when the mature female releases highly specific sex pheromones from specialized glands at the tip of her abdomen to attract males from considerable distances. Following successful copulation, the female deposits small clusters of yellowish eggs on the underside of host plant leaves. After a few days, the densely hairy caterpillars hatch and progress through several growth instars. Upon completing larval development, the caterpillar spins a protective cocoon made of silk and its own body hairs among leaf litter or on low stems, where it undergoes pupation before emerging as a winged adult.

Conservation status: Is not currently evaluated on the Red List of the International Union for Conservation of Nature (IUCN). Due to its wide geographic distribution and the abundance of its primary larval host plants, it is generally considered a species of least concern locally. Nevertheless, rapid habitat loss caused by deforestation and the fragmentation of neotropical rainforests present ongoing localized threats that could impact its population dynamics in the future.



Compilation and publication: EcoRegistros – 20/09/2026




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Foto
Photography ID: 140481
  Adult

General Villegas
Buenos Aires
Argentina
02/13/2016
Silvio Lamothe



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Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
40846613/02/2016ArgentinaBuenos AiresGeneral VillegasSilvio Lamothe
Page 1

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Please use the following reference when citing this species account.
EcoRegistros. 2026. Ctenucha rubriceps – Species account. Accessed from www.ecoregistros.org on 20/09/2026.