• Webster's Revised Unabridged Dictionary
    • n. pl Planipennia (Zoöl) A suborder of Neuroptera, including those that have broad, flat wings, as the ant-lion, lacewing, etc. Called also Planipennes.
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Century Dictionary and Cyclopedia
    • planipennia A suborder of neuropterous insects, with nearly equal naked many-veined wings not folded in repose, well-developed jaws, and elongate many-jointed antennæ. The larvæ are mostly terrestrial, and voracious insect-feeders; the pupæ are incomplete and inactive; the perfect insects are generally herbivorous. The suborder includes such forms as theant-lions (Mymeleontidæ), scorpion-flies (Panorpidæ), and sundry other families, which the genera Ascalaphus Hemerobius, Coniopteryx, Mantispa, Rhaphidia, and Síalis respectively represent. See cuts under ant-lion and Panorpa.
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Webster's Revised Unabridged Dictionary
NL., fr. L. planus, plane + penna, wing


In literature:

Planipennia: applied to Neuroptera in which the wings are large and laid flat on the body wnen at rest; Sialidae, Myrmeleonidae, etc.
"Explanation of Terms Used in Entomology" by John. B. Smith
Among them are the gauze-flies (Planipennia), caddis-flies (Phryganida), and fan-flies (Strepsiptera).
"The History of Creation, Vol. II (of 2)" by Ernst Haeckel