Cramer’s eighty-eight

Diaethria clymena

Mamarongo Magdalena Colombia

Quick Facts

  • Scientific Name: Diaethria clymena
  • Spanish Name: Ochenta y ocho
  • Family: Nymphalidae
  • Known Nicknames: Eighty-eight butterfly, Cramer's 88, Anna's eighty-eight
  • Average Length: 2.2–2.6 cm / 0.87–1.02 in (Forewing length)
  • Average Weight: 0.2–0.4 g / 0.007–0.014 oz
  • Wingspan: 4.0–5.2 cm / 1.6–2.0 in
  • Key Feature: Underwing pattern of black lines on white background forming the number '88' or '89'
  • Primary Diet: Frugivore (rotting fruit), mineral salts from damp soil and animal dung
  • Range: Central and South America, ranging from Mexico to Peru and Brazil
  • Habitat: Tropical rainforests, humid forest edges, and riverbanks
  • Social Structure: Solitary; males occasionally congregate at mud-puddling sites
  • Nesting/Breeding: Leaves of host plants, primarily Trema and Celtis species
  • Conservation Status: Not Evaluated (NE)
  • Population Trend: Stable

Cramer’s eighty-eight (*Diaethria clymena*) is a striking brush-footed butterfly native to the tropical forests of Central and South America, renowned for its extraordinary and whimsical wing patterns. While the upper side of its wings is a deep, velvety black accented by a shimmering diagonal band of iridescent blue or green, its most famous feature is found on the underside. The pale white hindwings are intricately marked with thin black lines that distinctly form the number "88"—or occasionally "89"—giving the species its unique common name. Beyond this numerical mimicry, the butterfly displays vibrant splashes of crimson on the underside of its forewings, making it a spectacular sight as it flits through the canopy or gathers at damp riverbanks to "puddle" for essential minerals.

Fun Facts

Cramer's eighty-eight is most famous for the striking black-and-white patterns on its hindwings that clearly resemble the numerals "88" or "89," a feature believed to confuse or startle potential predators. These butterflies exhibit a behavior known as "puddling," where they congregate on damp soil, rotting fruit, or even human skin to sip mineral-rich fluids and salts. While their undersides are flashily decorated with vibrant red and white, their upper wings are a dark, iridescent blue, allowing them to vanish instantly against the forest shade when they close their wings. They are also remarkably fast and erratic fliers, making them a difficult target for even the most agile insectivores.

Habitats & Distribution

This species is widely distributed across the Neotropical realm, with a range extending from Mexico through Central America and down into South America as far as northern Argentina. It is particularly prevalent throughout the Amazon basin, inhabiting various regions within countries such as Colombia, Peru, and Brazil. Its primary habitats consist of tropical and subtropical moist lowland forests, where it is frequently found in close proximity to rivers, streams, and other damp environments. These butterflies are often observed along forest edges and in sunlit clearings, where they congregate on wet soil, mud, or rotting fruit to absorb necessary minerals and moisture from the ground.

Behaviours & Reproduction

These butterflies exhibit a primarily solitary social structure, though males frequently congregate in small groups on moist soil or riverbanks to engage in "puddling," a behavior where they extract essential minerals and salts. Males are notably territorial, often perching on high leaves in sunlit clearings to monitor for rivals or potential mates. Their flight is rapid and nervous, serving as a primary defense mechanism alongside the confusing visual effect created by the distinctive wing patterns during motion. During the reproductive cycle, females deposit individual eggs on the underside of host plant leaves, specifically those in the *Trema* and *Celtis* genera. A significant reproductive strategy involves the male passing a nutrient-rich spermatophore to the female during mating; this package contains the sodium and proteins he collected while puddling, which the female uses to increase the survival rate and viability of her offspring. The resulting larvae are solitary and rely on cryptic coloration before forming a chrysalis to undergo metamorphosis.

Diet

The diet of Cramer's eighty-eight varies significantly between its life stages, with larvae primarily consuming the leaves of trees in the Ulmaceae family, such as Trema micrantha, and certain members of the Sapindaceae family. As adults, these butterflies exhibit unusual feeding behaviors compared to many other lepidopterans, as they rarely visit flowers for nectar. Instead, they are frequently observed congregating around rotting fruit, fermenting sap, and even animal excrement or carrion to extract essential nutrients and moisture. An interesting aspect of their dietary habits is "puddling," where they gather on damp soil or sand to siphon up mineralized water, a behavior that provides them with necessary salts and amino acids often lacking in their primary food sources.

Colors

Cramer's eighty-eight features a velvety black dorsal surface accented by a brilliant metallic blue or green diagonal band across the forewings. Its ventral side is more intricate, displaying vibrant red forewings and creamy white hindwings marked with distinct black concentric lines that form the numeral "88." This complex pattern serves as a unique form of disruptive coloration, helping the butterfly camouflage against textured bark or confuse predators during flight.