N A T U R K U N D L I C H E S   I N F O R M A T I O N S S Y S T E M

Eriocrania (Paracrania) chrysolepidella (Zeller, 1851)

(zoological nomenclature: valid name, available)

General information:

Micropteryx chrysolepidella Zeller, 1851: 342-343.
Type locality: Austria, Vienna
Type: Syntype : Austria, Vienna, leg. Mann, in May in beech forests; in coll. ?NHM, London

Synonyms, misspellings, wrong determinations, etc.:
Micropteryx kaltenbachii Wood, 1890: 5. Type locality: [Great Britain]. Junior subjective synonym.

Habit:

   
: Salzburg, Flachgau, Bergheim, Plainberg, 1965.04.04. leg. Fritz Mairhuber, coll. Haus der Natur : Salzburg, Flachgau, Kasern, 1968.04.17, leg. Fritz Mairhuber, coll. Haus der Natur    
Picture from: Kurz Michael
Detailed view
Picture from: Kurz Michael
Detailed view
   

Description of adults: Examined: 1 , 1 . Forewing length: 4.9 mm, 4.5 mm. Head black-brown; vestiture of hair-like scales on the head distant, sparse, mixed brown and beige; eyes small; length of maxillary palpi about 1.5 times the diameter of an eye, with mixed brown and beige scales; antennae about 3/5 of forewing length, filiform, brown, bronzy golden shining; thorax on the anterior margin bronzy golden, mixed purple; tegulae bronzy golden; forewings bronzy golden, more or less mixed with light golden and coppery to purple scales, forming an indistinct reticulate pattern in the distal third of the wing; basally of the tornus an indistinct golden spot at the inner margin, of roundish to triangulate shape, reaching across 1/4 of the wing width; fringe bronzy golden, slightly mixed purple; hindwings with broad scales in the distal part, as well as lanceolate scales basally of the discus, the latter not completely covering the wing membrane; hindwings bronzy golden, distally also coppery to purple, with bronzy golden fringe; legs brown, bronzy golden shining; foretibia without epiphysis, midtibia with a single spur at the distal end; hindtibia with two pairs of spurs, one pair at about 0.65 of the tibial length and one pair at the distal end.

Distribution:

Following Karsholt & Nieukerken (2004), E. chrysolepidella occurs in Great Britain, from France throughout central Europe to Sweden, Estonia and Lithuania, as well as in Romania. It seems to be absent from Siberia (Dubatolov 2012), as well as from the eastern Palaearctic region (anonymous 2012).

Biology:

The imagines fly in full sunshine from the end of March till early May (Kurz & Kurz 2017) around Corylus avellana and Carpinus betulus. During dull weather, they rest on the twigs (Heath, 1983).

Stages in development:

Egg. The eggs are deposited on leaf buds of Carpinus betulus, Ostrya carpinifolia or Corylus avellana (Heath 1983).

Larva. The larva feeds in a big, irregular, blotch-like mine in the leafs at the end of April and in May. (Heath 1983). Following Wood (1890), the four instars are described as follows: 1st instar: Whitish, with black head. 2nd instar: The black marks on segment two appear. 3rd instar: The larva looks rather yellowish in the mine, but this appears to be the affect partly of the colour of the mine itself, and partly of the greenish-yellow contents of the intestine, the colour of the skin being really whitish. 4th instar: Head pale brown, with darker mouth; a slight tinge of grey, especially posteriorly, represents what remains of the black mark on the upperside of segment two, that on the underside is broken up into a pair of large dark grey spots; the larva is also furnished with small abdominal projections.

Pupa. The pupa rests in a tough silken cocoon at the ground.

Anatomy:

 
-genitalia, schematic -genitalia, prep.-no. 474, M. Kurz: Salzburg, Flachgau, Bergheim, Plainberg, 1965.04.04, leg. Fritz Mairhuber, coll. Michael Kurz -genitalia, prep.-no. 481, M. Kurz: Salzburg, Flachgau, Kasern, 1968.04.17, leg. Fritz Mairhuber, coll. Haus der Natur, Salzburg  
Picture from: © Zagulayev 1978
Detailed view
Picture from: Kurz Michael
Detailed view
Picture from: Kurz Michael
Detailed view
 

Pregenital abdomen. Sternite V on both sides with a moderately big, round, weakly sclerotized spot each (sensory organ); females with additional, similar spots also on both sides of sternite IV, these spots of the same size as those on sternite V.

genitalia. Male genitalia very compact; uncus with two big, spatulate lobes with short spinoid setae; valves very much reduced, lobe-like, at the inner surface near the posterior margin with 3 - 4 rows of short spinoid setae; branches of the saccus of about the same length as the ventral margin of the vinculum, very slender, rod-like; aedeagus more than twice the length of the ventral margin of the vinculum, very slender; paramere very slender too, of the same length as the aedeagus, with a rounded tip posteriorly.

genitalia. Tergite IX (?) very much reduced and modified, forming inside the abdomen a twin structure of Y-like shape with very slender branches; apophyses anteriores and posteriores very long; inner genital organs not sclerotized.

Diagnosis:

E. chrysolepidella : Salzburg, Flachgau, Bergheim, Plainberg, 1965.04.04. leg. Fritz Mairhuber, coll. Haus der Natur E. cicatricella : Eastern Tyrol, Lengberg, 850 m, 2004.04.16, leg. Helmut Deutsch, coll. Michael Kurz E. chrysolepidella -genitalia, prep.-no. 474, M. Kurz: Salzburg, Flachgau, Bergheim, Plainberg, 1965.04.04, leg. Fritz Mairhuber, coll. Michael Kurz E. cicatricella -genitalia, prep.-no. 928, M. Kurz: Eastern Tyrol, Drau valley, near Lienz, Lengberg, 800-850 m, 2005.04.04, leg. Helmut Deutsch, coll. Michael Kurz
Picture from: Kurz Michael
Detailed view
Picture from: Kurz Michael
Detailed view
Picture from: Kurz Michael
Detailed view
Picture from: Kurz Michael
Detailed view
   
E. chrysolepidella -genitalia, prep.-no. 481, M. Kurz: Salzburg, Flachgau, Kasern, 1968.04.17, leg. Fritz Mairhuber, coll. Haus der Natur, Salzburg E. cicatricella -genitalia, prep.-no. 1009, M. Kurz: Austria, Salzburg, Gois, Goiser Moos, 436m, 2007.04.11, leg. et coll. Christof Zeller    
Picture from: Kurz Michael
Detailed view
Picture from: Kurz Michael
Detailed view
   

Extenernally very similar to E. chrysolepidella is Eriocrania cicatricella (Zetterstedt, 1839), which can be distinguished best by examination of the male and female genitalia, but also by its shorter antennae. In the -genitalia, both lobes of the uncus are comparatively short and broad in E. cicatricella, whereas in E. chrysolepidella, they are more elongate and narrower. In the -genitalia, the double internal, bifurcate sclerite is very big and conspicious in E. chrysolepidella, in E. cicatricella however, it is distinctly smaller.

Worth knowing:

Sources:

anonymous 2012. An Identification Guide of Japanese Moths Compiled by Everyone. URL: http://www.jpmoth.org [online 04 November 2012].
Dubatolov, V. V. 2012. Collection of Siberian Zoological Museum: Eriocraniidae. http://szmn.sbras.ru/Lepidop/Eriocran.htm [online 04 November 2012].
Heath, J. 1983. The moths and butterflies of Great Britain and Ireland, Vol.I: Micropterigidae – Heliozelidae. – Harley Books, Martins, Great Horkesley, Colchester, Essex.
Karsholt, O. 2004. Families Acanthopteroctetidae, Axiidae, Castniidae, Cossidae, Drepanidae, Eriocottidae, Eriocraniidae, Gelechiidae, Heterogynidae, Limacodidae, Lypusidae, Micropterigidae, Roeslerstammiidae, Somabrachyidae, Uraniidae. In: Karsholt, O. & E. J. van Nieukerken (eds.). Lepidoptera, Moths. – Fauna Europaea version 1.1, http://www.faunaeur.org [online 22 January 2009].
Kurz, M. A. & M. E. Kurz 2000–2017. Naturkundliches Informationssystem. – URL: http://www.nkis.info [online 08 March 2017].
Wood, J. H. 1890. Micropteryx larvae. Entomologist´s monthly Magazine, 26: 1-6.
Zagulajev, A.K. 1978. Eriocraniidae; in G.S. Medvedev (ed.): Keys to the insects of the europaean part of the USSR, Vol.IV: Lepidoptera, part 1 (english translation), Oxonian Press Pvt.Ltd., New Dehli, 1987
Zeller, P. C. 1851. Drei Schabengattungen: Incurvaria, Micropteryx und Nemophora; Linnaea Entomologica 5: 301-362, pl. 1.

Publication data:

history:
Kurz Michael: 2009.04.09
Kurz Michael: 2009.05.18
Kurz Michael: 2012.11.04
Kurz Michael: 2012.11.16
Kurz Michael: 2012.11.26
Kurz Michael: 2017.02.26
Kurz Michael: 2017.03.09
Kurz Michael: 2017.03.10
Kurz Michael: 2017.03.22
Document reviewed by:
not reviewed: 2017.03.22
Document released by:
Kurz Michael: 2017.03.22

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