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 auromarginella (Richardson, 1890)

(zoological nomenclature: valid name, available)

General information:

Nepticula auromarginella Richardson, 1890: 30-31.
Type locality: England, Dorset, Weymouth
Type: Lectotype: England, Dorset, Weymouth, ex Rubus, Richardson, in coll. NHM, London

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

Habit:

     
, schematic      
Picture from: Kurz Michael
Detailed view
     

Description of adults: : "Wingspan: 3.0-5.5 mm. Head: frontal tuft varying from yellowish orange to brown or black; collar bronzy brown; scape pale golden, lustrous; antenna two-thirds length of forewing, dark grey. Forewing: area proximal to fascia bronze-brown, becoming dark purple to bluish black towards fascia; fascia at three-fifths broad and distinct, golden; distal to fascia dark purple to bluish black, at base of terminal cilia a short golden fascia; terminal cilia dark grey. Hindwing: grey, more or less suffused with bronzy scales. Abdomen dark grey-brown with brown to yellowish anal tuft" (Nieukerken 2014).

: "Wingspan: 3.0-5.5 mm. Antenna slightly shorter than in male. Without anal tufts" (Nieukerken 2014).

Variability: "Swedish specimens are smaller, darker and frequently black-headed compared with English specimens. Adults from August are markedly smaller than adults from earlier in the year" (Nieukerken 2014).

Distribution:

Records of S. auromarginella are scattered throughout Europe: southern Scandinavia, Great Britain, Ireland, France, Portugal, Croatia, Bosnia, Serbia, Crete and Cyprus (Nieukerken 2014). Mines from the Balearic Isles on Rubus ulmifolius are doubtful and may also refer to Stigmella aurella (Kurz & Kurz 2014).

Biology:

The species occurs mainly in maritime localities and seems to prefer warm, sunny places. In Scandinavia, it occurs with two or three annual generations, from Great Britain southwards it seems to be continuously brooded (Nieukerken 2014).

Stages in development:

 
Mines and larvae: without data Mines: without data Probable mine on Rubus sanctus: Toscana, Marina di Pietrasanta, 2015.06.14, leg. Puchmayr & Kurz, coll. Michael Kurz  
Picture from: van Nieukerken E. J. (CC-BY-NC-SA/3.0)
Detailed view
Picture from: van Nieukerken E. J. (CC-BY-NC-SA/3.0)
Detailed view
Picture from: Kurz Michael
Detailed view
 

Description of early stages following Nieukerken (2014):

Egg. The egg is laid on the upperside of a leaf of Rubus fruticosus and closely related Rubus ssp. like Rubus ulmifolius (Kurz & Kurz 2014). It also has been found on Rubus idaeus (Kurz & Kurz 2014) and Agrimonia.

Larva. The larva is yellow. The mine is a short gallery, with the frass densely packed in leaves exposed to sun, scattered in thinner, unexposed leaves. The cocoon is pale brown.

Anatomy:

   
-genitalia, schematic -genitalia, schematic    
Picture from: Kurz Michael (redrawn from Johansson et al. 1990)
Detailed view
Picture from: Kurz Michael (redrawn from Johansson et al. 1990)
Detailed view
   

Genitalia. "Vinculum moderately long; anterior margin distinctly emarginate. Uncus distinctly bilobed, lobes without or with indistinct notch. Valva short, just reaching hind margin of uncus; with short triangular distal process. Transtilla with short, triangular sublateral processes. Juxta present. Aedeagus slightly longer than genital capsule; with irregular or boot-shaped cornutus near tip, proximal with numerous pointed cornuti" (Nieukerken 2014).

Genitalia. "Corpus bursae small, without pectinations. Vestibulum moderately swollen, posterior portion bilobed. Accessory sac as large as corpus bursae. Ductus spermathecae with scattered, minute spines in proximal part. Apophyses slender; posteriores and anteriores of subequal length" (Nieukerken 2014).

Diagnosis:

Diagnosis following Nieukerken 2014): S. auromarginella and Stigmella lediella (Schleich, 1867) are the only two European Stigmella species with patch (or fascia) of same colour as fascia at tip of forewing. In contrast to auromarginella, lediella has the entire area proximal to fascia coppery; lediella has silvery fascia and terminal patch (not golden). Male and female genitalia of auromarginella and lediella are very different.
The frass-filled mines of S. auromarginella are distinctly dark brown, the vacated mine does not turn white as in Stigmella splendidissimella (Herrich-Schäffer, 1855). The mine is markedly shorter than that of Stigmella aurella (Fabricius, 1775) and is the shortest Stigmella mine on Rubus fruticosus and related species.

Worth knowing:

Sources:

Kurz, M. A. & M. E. Kurz 2000–2014. Naturkundliches Informationssystem. – URL: http://www.nkis.info [online 2014.05.02].
Nieukerken, E. J. van 2014: Nepticulidae and Opostegidae of the world. - URL: http://nepticuloidea.info/ [online 2014.05.02].
Richardson, N. M. 1890. Description of a Nepticula (auromarginella) new to science from near Weymouth. The Entomologist´s Monthly Magazine 26: 30-31.

Publication data:

history:
Kurz Michael: 2014.05.02
Kurz Michael: 2014.05.06
Kurz Michael: 2015.10.29
Kurz Michael: 2016.09.07
Kurz Michael: 2017.05.10
not reviewed

Advertisement: