Megalomus hirtus explained

Megalomus hirtus, common name bordered brown lacewing, is a species of brown lacewings in the family Hemerobiidae.[1] [2] [3]

Distribution

This species is widespread in Northern and Central Europe.[4] In the United Kingdom it has a very restricted distribution.[5]

Habitat

These lacewings preferably inhabit hot meadows and the forest edges with broad-leaved trees and some shrubs.

Description

Megalomus hirtus has a wingspan of the front wings barely exceeding . Usually it reaches a wingspan of 6.5-. In these brown lacewings the radial sector of the fore wings shows at least five ribs, preferably six or seven. Moreover, the front and hind wings are rather dark, with well contrasted brown speckling and cross bands.[6] [7] The head and the body are glossy, black or brown black. Antennae are mostly dark brown. At rest, they may be kept between the wings and the legs. The body shows the same color as the head, but the first part is usually slightly brownish. The body and the wings are quite hairy.[8]

This species is rather similar to Megalomus tortricoides, that is slightly bigger, with a maculation of the front and back wings clear and only slightly contrasted. Moreover, the females can be separated only on the basis of tiny differences.[8]

Biology

Adults fly from June to August. The eggs are usually laid on the underside of leaves. After about four weeks the mature larvae spins a candy cocoon. This species is overwintering as a pupa. It has one or two generations a year.[8] Megalomus hirtus is linked almost exclusively to broad-leaved trees, with a preference for Corylus species. In UK it should have some kind of association with wood sage (Teucrium scorodonia), that usually grows on rocky slopes.[5] The larvae are active predators on aphids[8] or on the larvae of other small insects that have wood sage as host plant.[9]

Bibliography

Notes and References

  1. http://lacewing.tamu.edu/SpeciesCatalog/Record?SpecNum=255&Genu=Megalomus&Subg=$&CombSpgrName=$&Spec=hirtus&Subs=$&RankAbbreviation=&Infr=$&CombSubiRankAbbrev=&CombSubiName=$&LParen=(&CombCite10=Linnaeus&CombCite271l=1761&RParen=)&ASOrde=Neuroptera&ASFami=Hemerobiidae&CombinationNum=7128 Lacewing Digital Library
  2. https://www.gbif.org/species/2101799 GBIF
  3. https://www.biolib.cz/en/taxon/id104338/ Biolib
  4. https://fauna-eu.org/cdm_dataportal/taxon/9bb7b29e-629c-4f93-8724-eff5e7eea3b4 Fauna Europaea
  5. M. Smith, S. Burgess The bordered brown lacewing Megalomus hirtus (L. 1761) rediscovered: an invertebrate survey in Holyrood Park, Edinburgh
  6. Aspöck H., Aspöck U. & Hölzel H. (1980) - Die Neuropteres Europas – Goecke & Evers, Krefeld
  7. http://neurotteri.casaccia.enea.it/key.htm De Sancti Petri Fabrica per il riconoscimento dei Neuropterida adulti (specie) e stadi preimmaginali (quando va bene, generi, se non famiglie) dell’area geografica ± europea
  8. https://www.artsdatabanken.no/Pages/223106 Arts Data Banken
  9. https://www.academia.edu/20253348/Ant-lions_at_Dunwich_heath The bordered brown lacewing at its last remaining UK site

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