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

Micropterix isobasella Staudinger, 1871

(zoological nomenclature: valid name, available)

General information:

Micropteryx isobasella Staudinger, 1871: 289
Type locality: Italy, western Alps, Macugnaga
Type: 6 syntypes in coll. ZMHB

Synonyms, misspellings, wrong determinations, etc.:
Micropteryx isobasella f. weberi Müller-Rutz, 1927. Infrasubspecific.

Habit:

   
: Valais, Zwischbergental, 1650 m, 2002.07.23, leg. Renate Hausenblas und Christof Zeller, coll. Christof Zeller : Valais, Zwischbergental, 1650 m, 2002.07.23, leg. Renate Hausenblas und Christof Zeller, coll. Christof Zeller    
Picture from: Kurz Michael
Detailed view
Picture from: Kurz Michael
Detailed view
   

Scheme of wing pattern:

Description of adults: Examined: 2 , 5 . Forewing length: 3.5 - 3.8 mm, 3.0 - 4.4 mm. Head black-brown; vestiture of hair-like scales on the head rusty yellow; antennae dark brown, coppery shining, slightly more than 3/4 (), respectively, slightly more than 1/2 () of forewing length; thorax bronzy golden; tegulae bronzy golden, posteriorly with single purple scales; forewing golden with a greenish tinge; costal margin purplish up to 3/4; almost invisible bronzy golden transverse fasciae or spots at 1/3 and 2/3, seldom of diffuse reddish colour (f. weberi Müller-Rutz); base slightly darker, the darker colouration extending from costa across 1/3 of forewing width; fringe light golden, with a purple tinge, especially at its base; hindwing bronzy golden, fringe golden, both with a purple tinge; legs and abdomen brown, golden shining.

Distribution:

According to Heath (1996) the species is restricted to Italy and Switzerland, where it seems to be distributed only in southern Switzerland and the adjacent northern Italy (Meeß 1910; Meyrick 1912).
Records from Sicily probably belong to M. sicanella Z. (f. obsoleta), records from North Africa to Micropterix constantinella Heath, 1986 or to Micropterix eatoniella Heath, 1986. Vertical distribution has been documented so far from 1550-2050 m a.s.l. (Kurz & Kurz 2011).

Biology:

Two of the examined specimens were found swarming around Lonicera sp., further records are from tall herbaceous vegetation in a mixed larch-pine forest at 1650–1800 m a.s.l. (Zeller et al. 2007, Kurz & Kurz 2011). The imagines have been found on the wing in July (Kurz & Kurz 2011).

Stages in development:

The early stages are unknown.

Anatomy:

, scheme of cuticle -genitalia prep.no. 805, M. Kurz: Valais, Zwischbergental, 1650 m 2002.07.23, leg. Renatae Hausenblas, Christof Zeller, coll. Michael Kurz -Genitalia, prep.-no. 343, M.Kurz: "Helvetia; Laquintal; 18.7.1936; leg. P.Weber", backside: "Laquintal; Simplon, 18.VII.36; 12284; ", "M. isobasella; f. weberi M.R.", coll.Klimesch (ZSM, Munich) -Genitalia prep.-no. 806, M.Kurz, preparation in caustic potassium: Valais, Zwischbergental, 1650 m, 2002.07.23, leg. Renate Hausenblas, Christof, Zeller, 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
   
-genitalia prep.-no. 806, M. Kurz, permanent preparation: Valais, Zwischbergental, 1650 m, 2002.07.23, leg. Renate Hausenblas, Christof, Zeller, coll. Michael Kurz -genitalia, prep.-no. 806, M.Kurz: Valais, Zwischbergental, 1650 m, 2002.07.23, leg. Renate Hausenblas, Christof Zeller, coll. Michael Kurz    
Picture from: Kurz Michael
Detailed view
Picture from: Kurz Michael
Detailed view
   

Genitalia. Uncus moderately long, somewhat stout, with a broad tip; a paired association of hair-like setae ventrally beyond the uncus; accessory claspers moderately long, nearly keel-shaped, with about 11–12 elongate, straight, unmodified setae at the rounded distal margin; another irregular row of five or six shorter, finer setae, which are more inwardly located (shape not characterised as mostly folded in the permanent preparation); an area of long, straight spinoid setae dorsal of the accessory claspers; valvae moderately long, stout, distal third enlarged and strongly bent upwards (constricted at the point of inflection); on the inner surface of the valvae three shorter setae postbasally; on the inner surface of the lower margin two to three irregular rows of shorter spinoid setae and some longer setae on the distal fourth.

Genitalia. Tergite IX missing; sternite IX reduced, constricted medially, with strongly fringed lateral margins, without diagnostic features. Terminal papillae with two sclerotized plates forming an undiagnostic band; ductus receptaculi thin and strongly bent, at the beginning of the receptaculum seminis short and straight; receptaculum seminis long and slender, constricted in the first third, with generotypical transverse striation.

Diagnosis:

M. isobasella : Valais, Zwischbergental, 1650 m, 2002.07.23, leg. Renate Hausenblas und Christof Zeller, coll. Christof Zeller M. calthella : Tuscany, Pisa district, near Laura, Lorenzana, 1995.05.07, leg. H/Z/K, coll. Michael Kurz M. aruncella : Austria, Salzburg, Thalgau, 1989.05.18, leg. et coll. Michael Kurz M. paykullella (form without markings): France, Alpes Maritimes, Marguareis, 2000.07.22, leg. Renate Hausenblas and Christof Zeller, coll. Christof Zeller
Picture from: Kurz Michael
Detailed view
Picture from: Kurz Michael
Detailed view
Picture from: Kurz Michael
Detailed view
Picture from: Kurz Michael
Detailed view
M. mansuetella : Bavaria, Oberbayern, Wolfratshausen, Königsdorfer Moor, 2002.05.10, leg. et coll. Theo Grünewald M. stuebneri PARATYPE: Spain, Andalucia, Sierra Nevada, Posada de los Arrieros, 1700 m, 2011.06.21, leg. et coll. A. Werno M. isobasella -genitalia prep.no. 805, M. Kurz: Valais, Zwischbergental, 1650 m 2002.07.23, leg. Renatae Hausenblas, Christof Zeller, coll. Michael Kurz M. calthella -genitalia, prep.-no. 251, M. Kurz: Salzburg, Flachgau, Thalgau, Thalgauegg, 1987.05.17, leg. Zeller/Kurz, 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
M. aruncella -genitalia, prep.-no. 780, M. Kurz: Vorarlberg, Bregenzer Wald, near Mellau, trail to Hangspitze, 2004.08.07, coll. Michael Kurz M. paykullella -genitalia (form without markings), prep.-no. 741, M.Kurz: France, Alpes Maritimes, Marguareis, 2000.07.22, leg. Hausenblas und Zeller, coll. Michael Kurz M. mansuetella -genitalia, prep.-no. 788, M. Kurz: Bavaria, Oberpfalz, Regensburg, Bodenwöhr, 2003.05.18, leg. Renate Hausenblas, Christof Zeller, coll. Michael Kurz M. stuebneri -genitalia, prep.-no. 973, M. Kurz, PARATYPE: Spain, Andalucia, Sierra Nevada, Posada de los Arrieros, 1700 m, 2001.06.21, leg. et coll. F. Theimer
Picture from: Kurz Michael
Detailed view
Picture from: Kurz Michael
Detailed view
Picture from: Kurz Michael
Detailed view
Picture from: Kurz Michael
Detailed view
M. isobasella -genitalia, prep.-no. 806, M. Kurz: Valais, Zwischbergental, 1650 m, 2002.07.23, leg. Renate Hausenblas, Christof, Zeller, coll. Michael Kurz M. calthella -genitalia, prep.-no. 961, M. Kurz: Salzburg, Flachgau, Thalgau, Stilles Tal, 1987.05.29, leg. Zeller/Kurz, coll. Michael Kurz M. aruncella -genitalia, prep.-no. 809, M. Kurz: Slovenia, Karst, Wippach valley, Nanos, 600 m, 1998.05.25, leg. Helmut Deutsch, coll. Michael Kurz M. paykullella -genitalia, prep.-no. 811, M. Kurz: Piemonte, province of Cuneo, Bersezio, 1973.07.21, leg. J.Klimesch, 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
   
M. mansuetella -genitalia, prep.-no. 760, M. Kurz: without data, coll. Zoologische Sammlung des Bayrischen Staates, Munich M. stuebneri -genitalia, prep.-no. 974, M. Kurz, PARATYPE: Spain, Andalucia, Sierra Nevada, Posada de los Arrieros, 1700 m, 2011.06.21, leg. et coll. A. Werno    
Picture from: Kurz Michael
Detailed view
Picture from: Kurz Michael
Detailed view
   

Micropterix isobasella Staudinger, 1871 can be separated from Micropterix calthella (Linné, 1761) and from females of Micropterix aruncella (Scopoli, 1763) by its almost complete lack of purple colouration at the forewing base. M. calthella has an extended purple basal area, whereas females of M. aruncella have only the base of the costa purplish coloured (males of M. aruncella are distinguished by their silvery fasciae). M. isobasella has but only a slight purple colouration along the costa. Furthermore, M. isobasella and M. calthella are very unlikely to overlap in vertical distribution. In upper montane and subalpine areas of the southwestern Alps, a form of Micropterix paykullella (Fabricius, 1794) has been found very locally, more or less devoid of any markings. This form can be distinguished from M. isobasella only by examination of the male genitalia. All other golden species without markings do not occur in the Alps, but in the central and southern Mediterranean area. In the male genitalia, all mentioned species are easily distinguishable. In the female genitalia however, only M. aruncella can be recognized with some certainty by its reduced sternite IX and by the somewhat protruding terminal papillae. Females of the other three species cannot be identified with certainty due to their intraspecific variability.

Phylogeny: The structure of the male genitalia resembles that of the recently described Micropterix stuebneri Zeller, Werno & Kurz 2013 quite well. Its simple characters furthermore, are interpreted as primitive, therefore linking the species maybe to Micropterix mansuetella Zeller, 1844.

Worth knowing:

Sources:

Heath, J. 1996. Family Micropterigidae – In: O. Karsholt & J. Razowski (eds), The Lepidoptera of Europa. A distributional checklist. – Apollo-Books, Stenstrup.
Kurz, M. A. & M. E. Kurz 2000–2011. Naturkundliches Informationssystem. – URL: http://www.nkis.info [online 21 November 2011].
Meeß, A. 1910. Micropterygideae. pp. 483–484. – In: A. Spuler (1903–1910), Die Schmetterlinge Europas. – E. Schweitzerbart´sche Verlagsbuchhandlung, Stuttgart. 523 pp., 91 pls.
Meyrick, E. 1912. Adelidae, Micropterygidae, Gracilariadae. – In: H. Wagner (ed.), Lepidopterorum Catalogus, pars 6, Berlin.
Müller-Rutz, J. 1927. Die Schmetterlinge der Schweiz. – Mitteilungen der Schweizerischen Entomologischen Gesellschaft 13: 532–533.
Staudinger, O. 1870–1871. Beschreibung neuer Lepidopteren des europäischen Faunengebiets. – Berliner Entomologische Zeitschrift 14: 97-132, 193–208 (1870); 273–330 (1871).
Zeller-Lukashort H. C., A. Werno & M. A. Kurz 2013. A new species of Micropterix Hübner, [1825] from southern Spain (Lepidoptera: Micropterigidae). SHILAP Revista de Lepidopterología 41 (164): 489-494.

Publication data:

history:
Kurz Michael: 2006.03.13
Zeller Christof: 2006.11.18
Kurz Michael: 2008.10.31
Kurz Michael: 2011.11.21
Kurz Michael: 2011.11.22
Kurz Michael: 2012.04.18
Kurz Michael: 2014.02.06
Document reviewed by:
not reviewed: 2014.02.06
Document released by:
Kurz Michael: 2014.02.06

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