Pepsis menechma

Lepeletier, 1845

Elegant Tarantula Hawk

Pepsis menechma, commonly known as the elegant tarantula hawk, is a large spider wasp in the Pompilidae. In 2005, Vardy synonymized 18 previously recognized under this name, establishing it as a single widespread transamerican species with extensive color variation across its range. The species is distributed from North America through South America. Like other tarantula hawks, females hunt tarantulas as for their larvae.

Pepsis menechma P1020412a by
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Pepsis menechma P1020422a by
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Pepsis menechma P1020416a by
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Pronunciation

How to pronounce Pepsis menechma: /ˈpɛp.sɪs məˈnɛk.mə/

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Distribution

Widely distributed from North America through South America. GBIF records indicate presence in Brazilian states including Amazonas (BR-AM), Bahia (BR-BA), Minas Gerais (BR-MG), Mato Grosso (BR-MT), and Pará (BR-PA).

Diet

feed on nectar, particularly from milkweed flowers (Asclepias spp.). Larvae are obligate of tarantulas.

Host Associations

Tarantulas - Females hunt tarantulas, sting them to induce paralysis, and lay a single on the living spider. The larva consumes the spider as it develops.

Life Cycle

Females lay a single on a paralyzed tarantula cached in an underground burrow. The larva hatches and feeds on the living spider, eventually pupating within a silken cocoon and emerging as an .

Ecological Role

As a of tarantulas, P. menechma helps regulate spider . may contribute to pollination through nectar feeding.

Human Relevance

The possesses an extremely painful sting used primarily for defense. Justin Schmidt's sting ranks tarantula hawk stings among the most painful of any insect, though the venom causes no lasting tissue damage. The 's bright aposematic coloration serves as a warning to potential .

Similar Taxa

Pepsis grossaSimilar large size and coloration; both exhibit orange-winged and black-winged morphs. P. grossa females average 43 mm body length and males have 12 antennal segments, a unique feature among Pepsis .
Hemipepsis ustulataAnother large tarantula hawk with overlapping range. Hemipepsis are matte black rather than iridescent blue-black, and tend to fly earlier in the season than Pepsis in the southwestern U.S.
Tragidion spp.Longhorn beetles (Cerambycidae) that mimic Pepsis tarantula hawks in coloration, with bright orange and black patterns. These beetles are harmless but gain protection through .

More Details

Taxonomic History

In 2005, Vardy conducted a major revision synonymizing 18 previously valid under P. menechma, recognizing it as a single widespread species with numerous color forms across its transamerican range.