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Butterflies of Zihuatanejo

SUPERFAMILY PAPILIONOIDEA

-Animals (Kingdom Animalia)

-Arthropods (Phylum Arthropoda)

-Hexapods (Subphylum Hexapoda)

-Insects (Class Insecta)

-Winged and Once-winged Insects (Subclass Pterygota)

-Butterflies and Moths (Order Lepidoptera)

-Butterflies (Superfamily Papilionoidea)

-Brush-footed Butterflies (Family Nymphalidae)

-Gossamer-winged Butterflies (Family Lycaenidae)

-Hairstreaks (Subfamily Theclinae)

-Tribe Eumaeini

-Subtribe Eumaeina

-Cycadians (Genus Eumaeus)

-Mexican Cycadian (Eumaeus toxea)


The Mexican Cycadian (Eumaeus toxea) is a striking and distinctive butterfly native to western Mexico, where it is closely associated with native cycad plants, particularly species of Dioon. Medium-sized and boldly patterned, it is best known for its dramatic coloration: the wings are deep velvety black marked with vivid turquoise to white spots or bands, while the abdomen and portions of the thorax are often a conspicuous bright red or orange, signaling toxicity. This warning coloration reflects the butterfly’s biology—both the larvae and adults sequester toxic compounds from their cycad host plants, making them unpalatable to predators. The caterpillars are especially notable, being bright red with rows of black spines, and they often feed openly in groups on cycad leaves. Adults fly deliberately and close to the ground, frequently seen around their host plants in tropical dry forest and woodland habitats.

Diet

  • Caterpillars are highly specialized feeders on cycads (Zamiaceae).

  • The young larvae scrape the surface of the cycad leaves, while older caterpillars consume progressively larger portions of the foliage.

  • Like other Eumaeus, the caterpillars are able to tolerate and sequester toxic compounds produced by cycads, making the larvae and adults distasteful to predators.

Range

  • The Mexican Cycadian ranges from eastern and western Mexico through Central America to Nicaragua, with extremely rare occurrences farther north as strays.

  • It occurs in Guerrero, including areas around Chilpancingo and Acapulco, placing the Zihua region within its broad Mexican range.

  • Its distribution is closely tied to the presence of suitable cycads, making the butterfly considerably more localized than its overall geographic range might suggest.

Habitat

  • It inhabits tropical and subtropical woodland, dry forest, forest edges, and other wooded habitats supporting native cycads.

  • The butterfly is particularly dependent on the persistence of its cycad host plants and associated forest habitat.

  • Around Zihua, areas of dry tropical forest and woodland containing suitable Zamia are the most promising places to encounter it.

Description

  • A medium-sized hairstreak with a wingspan of approximately 32–51 mm.

  • The upper surface is predominantly black with an intense blue to blue-green metallic sheen, particularly toward the bases and central portions of the wings.

  • The hindwings have rows of iridescent blue-green spots along the outer portion and a conspicuous orange-red spot near the anal angle.

  • The underside is predominantly dark, with several rows of blue-green markings on the hindwings and the orange-red anal spot repeated below.

  • The abdomen is strikingly orange-red beneath, contrasting strongly with the dark wings and thorax.

  • Males and females are quite similar in appearance, making sex difficult to determine from coloration alone.

Mexican Cycadian

Eumaeus toxea

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