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

Stigmella benanderella (Wolff, 1955)

(zoological nomenclature: valid name, available)

General information:

Nepticula benanderella Wolff, 1955: 49.
Type locality: Sweden, Blekinge, Listerlandet
Type: Holotype : Sweden, Blekinge, Listerlandet, larva 11.7.1941, Salix repens, e.l. 30.7.1941, Benander, in coll. Lund Museum

Synonyms, misspellings, wrong determinations, etc.:
Nepticula scandicella Jonasson in Krogerus et al., 1971: nomen nudum, unavailable.

Habit:

     
, schematic      
Picture from: Kurz Michael
Detailed view
     

Description of adults: (Johansson et al. 1990) : "Wingspan 4.6-5.2 mm. Head: frontal tuft grey-brown; collar and scape yellowish white; antenna dark grey, half length of forewing. Thorax grey-brown. Forewing: area proximal to fascia grey-brown, coarsely scaled; fascia at three-fourths from wing base, yellowish grey, very indistinct and usually reduced to two opposite spots or altogether absent; distal to fascia dark grey, coarsely scaled; terminal cilia pale yellowish grey, darker grey at tornus. Hindwing: pale grey, cilia pale yellowish grey. Abdomen dark grey with small, yellowish grey anal tufts."

: "Wingspan 3.8-5.0 mm.Frontal tuft yellowish grey, on vertex more or less mixed with dark grey-brown, antenna slightly less than half length of forewing. Inner half of forewing pale ochreous, usually with a few brownish scales at base of costa and before fascia; fascia reduced to a few slightly paler scales at costa and tornus; apical part grey-brown to dark grey, coarsely scaled, cilia pale yellowish. Hindwing and cilia pale yellowish grey. Abdomen dark grey; ovipositor not or only slightly protruding; anal tufts short, grey-brown."

Variability: From northern Sweden and Finland, a slightly larger, unicolorous form (f. scandicella) is known (Johansson et al. 1990).

Distribution:

The species has been recorded from Fennoscandia, Denmark, the Baltic region, Hungary and Slovakia (Nieukerken 2016).

Biology:

In southern Sweden, the species occurs in at least two generations with moths recorded in May, early July and early August. Mining larvae have been found here in the first half of July, mid-August and September. The norhern forms however, seem to be univoltine with adults in June (Johansson et al. 1990).

Stages in development:

Description of early stages following Johansson et al. (1990) and Nieukerken (2016):

Egg. In southern Sweden, in at least 75%, laid on upper side of leaf, away from rib or margin.

Larva. The larva is yellow. The larvae feed on Salix phylicifolia, Salix repens and Salix rosmarinifolia. The cocoon is brown.

Mine. The mine consists of a short corridor, almost completely filled with frass, widening into, and often overrun by, a short blotch.

Anatomy:

   
-genitalia -genitalia    
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 with shallow anterior emargination. Uncus long, tapering, with deep medial incision. Gnathos with long, parallel horns and prominent anterior processes. Valva relatively short, terminating in two equally long, blunt processes. Transtilla with distinct sublateral processes. Aedeagus short, approximately two thirds length of genital capsule, with 5-6 unilaterally more sclerotized cornuti and one equally long, sharply pointed spine; ometimes a few very small additional spine." (Johansson et al. 1990).

genitalia. "Corpus bursae with band of relatively large dentate chitin-plates and dense cover of long but indistinct pectinations, posterior part of bursa (ductus bursae) wide. Ductus spermathecae without spines. Apophyses anteriores short, posteriores distinctly longer. Anal tufts less than half length od apophyses. Ovipositor not or only slightly protruding, tip blunt." (Johansson et al. 1990).

Diagnosis:

"Male specimens of zelleriella and benanderella are very similar but the latter is usually smaller, more coarsely scaled and lacks purplish lustre on forewing apex. The genitalia are easily separable by the shape of uncus and valvae. Females of zelleriella, benanderella and floslactella are similarly coloured; benanderella can be separted from zelleriella by smaller size and blunt abdominal tip; floslactella is more coarsely scaled and has more contrasting wing pattern with blackish wing apex and contrasting yellowish white cilia. The shape of the apophyses provide good separating characters; long and broad in zelleriella, long and very slender in floslactella and short in benanderella." (Johansson et al. 1990).

Worth knowing:

Sources:

Johansson, R., E. S. Nielsen, E. J. van Nieukerken & B. Gustafsson 1990. The Nepticulidae and Opostegidae (Lepidoptera) of North West Eurpe. Fauna Entomologica Scandinavica, vol. 23, 2 parts, 739 pp., 1122 [54 col.] figures.
Nieukerken, E. J. van 2016. Nepticulidae and Opostegidae of the world. - URL: http://nepticuloidea.info/ [online 2016.03.18].
Wolff, N. L. 1955. Nepticula benanderella n. sp. (Lep., Nepticulidae). Opuscula Entomologica 20: 49-53.

Publication data:

history:
Kurz Michael: 2016.03.21
Kurz Michael: 2017.03.08
Kurz Michael: 2017.07.27
Kurz Michael: 2018.05.16
not reviewed

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