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

Stigmella geimontani (Klimesch, 1940)

(zoological nomenclature: valid name, available)

General information:

Nepticula geimontani Klimesch, 1940: 89.
Type locality: Upper Austria, Dachstein, Ochsenwieshöhe, about 2000 m
Type: Syntypes: Upper Austria, Dachstein, Ochsenwieshöhe, about 2000 m, 22.8.1939 e.l. Geum montanum, in coll. ZSM, Munich

Synonyms, misspellings, wrong determinations, etc.:
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Habit:

Description of adults: Examined: Original description. Wing expanse: 6.0 mm, 5.5 - 5.7 mm. Vestiture of hair-like scales on the head black in both sexes, collare and eyecaps yellowish; forewings elongated, smoothly scaled, shining, pale olive-grey in ; at 2/3 a light, weakly metallic, indistinctly bordered, slightly oblique fascia; fringe light grey; more stout, with darker colouration, forewing greenish brassy towards fascia with coppery reflections near to fascia; fascia more metallic and more distinctly bordered than in ; from fascia to apex purple brown; fringe dark grey, apically lighter; hindwings grey in both sexes with lighter fringe; antennae long, in male about 2/3 of forewing length, somewhat shorter in female; thorax and abdomen blackish grey, in with blackish pencils; legs dark grey, lighter outside (Klimesch 1940).

Distribution:

The species is known so far only from three localities in Upper Austria and Styria: Upper Austria, Dachstein, Ochsenwieshöhe, about 2000 m, Styria, Niedere Tauern, Großer Bösenstein, about 1900 m and Zeiritzkampel, 1700 m.

Stages in development:

     
Mine on Geum montanum: Upper Austria, Dachstein, 2000 m, leg. Josef Klimesch      
Picture from: Kurz Michael (redrawn from Klimesch 1981)
Detailed view
     

Description of early stages following Klimesch (1940 and 1981):

Egg. The egg is laid on the underside of a ground-leaf of Geum montanum. It is dark grey and conspicious.

Larva. Larva amber-yellow with brown head; cocoon bright yellow-brown, later darkening, smooth; leaf around initial part of mine often conspiciously reddish, caused by Anthocyan; mine here more or less wound, with broad, partly interrupted frass-line, which does not completely fill the corridor; later, mine turning into a big blotch with loosened frass.

Pupa. When hatching, the pupa drops out from the cocoon completely and moves some distance on the ground, before the adult emerges. The imagines develope in the late morning.

Anatomy:

genitalia (Klimesch 1981). Uncus medially and laterally evenly excided; convex ventral margin of valvae apically tapering into an inwardly directed tip; caudal part of saccus evenly recessed; arms of gnathos approximated to each other like in the other species of the group; aedeagus with 5 strong cornuti in apical half, proximally a group of smaller, densely and among themselves inserted cornuti, followed basally by a cornutal plate of granular structure.

genitalia. Vestibulum distinctly offset from Introitus vaginae by a constriction; bursa copulatrix elongated, bag-like.

Diagnosis:

The foodplant of the larva, Geum montanum, characterizes the species very well among its relatives. Only Stigmella pretiosa (Heinemann, 1862) produces very similar mines on the same foodplant in the Polish Tatra (Toll 1948, Borkowski 1970). This species however, is well separated from S. geimontani by the two silvery fasciae on the forewing, as well as anatomically.

Worth knowing:

Sources:

Borkowski, A. 1970. Studien an Stigmelliden (Lep.), Teil III., Beitrag zur Kenntnis der Stigmellidenfauna Polens. Polskie pismo entomologiczne 40: 541-555.
Klimesch, J. 1940. Beschreibung einiger neuer Nepticula-Arten (Lep., Nepticulidae). Zeitschrift des Wiener Entomologen-Vereines, 25: 79-81, 88-94, pls. 14-15.
Klimesch, J. 1981. Beiträge zur Kenntnis der Nepticulidae (Lep., Monotrysia). 1. Die Futterpflanzen der Nahrungsrassen der Stigmella aurella (F.) in Oberösterreich. 2. Stigmella tormentillella (H.S.) und verwandte Arten in den Ostalpen. Zeitschrift der Arbeitsgemeinschaft Österreichsicher Entomologen 32 (3/4): 113-128.
Toll, S. 1948. Nepticula geimontani KLIM. w Polsce. Documenta physiographica Poloniae 9: 1-5.

Publication data:

history:
Kurz Michael: 2015.12.04
Kurz Michael: 2016.08.02
not reviewed

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