Ascalaphinae

split-eyed owlflies, owlflies

Genus Guides

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Ascalaphinae is the type of the owlfly Myrmeleontidae (order Neuroptera), distinguished by the diagnostic of a ridge dividing each large —hence 'split-eyed owlflies.' This trait is shared with the subfamily Ululodinae. The subfamily is predominantly tropical in distribution and represents one of two main lineages of living , the other being Haplogleniinae with unsplit . The first fossil record dates to the Miocene, suggesting Paleogene origin.

Ascalaphinae by (c) portioid, some rights reserved (CC BY), uploaded by portioid. Used under a CC-BY license.Ascalaphinae by (c) Wynand Uys, some rights reserved (CC BY), uploaded by Wynand Uys. Used under a CC-BY license.Ululodes quadripunctatus 157281630 by Chrissy McClarren and Andy Reago. Used under a CC0 license.

Pronunciation

How to pronounce Ascalaphinae: //ˌæ.skəˈlæ.fɪ.niː//

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Identification

Split-eyed owlflies are immediately recognized by the prominent ridge bisecting each , creating the appearance of four rather than two. This 'split-eye' condition is shared only with Ululodinae among owlflies. have large, bulging eyes, long clubbed , and many-veined wings resembling those of or butterflies. The combination of divided eyes and clubbed antennae separates them from superficially similar Odonata.

Images

Distribution

Most occur in tropical regions worldwide. Records include Pakistan (15 , 22 species), India, China (first record of Ogcogaster), Colombia (first records of Ameropterus and Fillus), and Africa (Cameroon, Gabon, Ivory Coast, Benin, Ghana, Guinea, Liberia). The shows greatest diversity in the Oriental and Afrotropical realms.

Diet

are but are cumbersome fliers with relatively weak mouthparts compared to ; they are restricted to small and defenseless prey. Larvae are voracious ambush capable of tackling active prey such as ants.

Life Cycle

Holometabolous development. Larvae resemble antlions in appearance and habits, lying on the ground with large trap-jaws held open and often camouflaging themselves with sand and debris. Prey contact triggers rapid jaw closure, followed by paralysis and extraoral digestion.

Behavior

are but may be attracted to light at night. They often adopt a cryptic resting posture with the projecting from the perch, resembling a twig. Larvae are ambush that camouflage with substrate debris.

Ecological Role

Larvae function as sit-and-wait in sandy and ground-level . are weak aerial predators of small insects.

Human Relevance

are sometimes mistaken for or butterflies due to convergent wing and . Larvae may be encountered by entomologists searching antlion-like pit traps in sandy substrates.

Similar Taxa

  • UlulodinaeAlso has divided ; distinguished by other morphological features not specified in sources
  • HaplogleniinaeThe other main lineage of , but retains unsplit like ancestral condition
  • Myrmeleontidae (antlions)Larvae resemble antlions in appearance and habits, but antlion lack divided and clubbed ; antlion larvae construct pit traps rather than lying exposed on substrate

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Sources and further reading