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Nepticuloidea
Stigmella ilicifoliella (Mendes, 1918)
Stigmella ilicifoliella
Diagnostic description:Diagnosis. Almost inseparable from the sympatric S. suberivora, except for the much narrower male genitalia, which can be seen without dissection with some experience. Males also have significantly longer antennae than suberivora, but there is some overlap, in females the difference is less obvious. Valvae not bulging, without field of papillae, but with a field of many setae, genitalia capsule longer than wide. Female genitalia with ductus spermathecae with 4.5 convolutions, ratio bursa /accessory sac 2.3-3, smaller than in suberivora; usually more setae on T8.
Morphology:Description. Male. Forewing length 2.5-3.0 mm, wingspan 6.0-6.6 mm. Head: frontal tuft from almost white or ochreous to yellowish orange, occasionally black, collar pale grey to dark grey-fuscous. Scape pale yellow. Antenna slightly darker, 3/5 of forewing length, with 39-50 segments, ratio to forewing length 15-19 segments/mm. Thorax and forewing unicolorous dark bronze brown, at base and on thorax almost bluish black in fresh specimens, a faint purplish lustre at apex; terminal cilia concolorous, underside bronze-brown. Hindwing coarsely scaled, dark grey-brown, dorsum with long dark brown to bluish black androconial scales, extending into fringe, the longest near base, approximately 3/4 of cilia length; along basal half of costa long curved, spatulate bluish-black androconial scales, the longest as long as or longer than the shortest dorsal androconial scales; underside grey brown, cilia dark grey. Abdomen dark grey brown, with conspicuous white to pale yellowish anal tufts inserted on well sclerotized plates; genital capsule not particularly broad, valvae with dense tuft of hairs.
Female. Forewing length 2.5-2.9 mm. Antennae with 33-40 segments, ratio to forewing length 12-16 segments/mm. As male, but collar yellowish white to pale yellow, hindwing grey, androconial scales absent, abdomen dark grey-brown, without anal tufts.
Male genitalia. Measurements: see table 3. Capsule longer than wide or almost as long as wide. Vinculum anteriorly slightly bilobed. Uncus with widely separated horns. Gnathos with widely separated posterior processes with club-shaped tips. Valva with pointed distal process less than 1/4 valva length, pointing slightly inwards; inner margin forming a rounded lobe, ventral outer lobe pronounced, but not as bulging as in suberivora, covered with field of dense setae, but no papillae; sublateral processes short. Aedeagus with vesica with a more or less curved group of cornuti in basal half; this band comprises about 20-30 large cornuti with serrated bases and many small spinelike cornuti; more distally there is a group of ca 7-12 long needle-shaped cornuti and a few near phallotrema; manica covering aedeagus almost completely, except anteriormost part, covered with small spines and pectinations.
Female genitalia. T8 with ca 25-50 setae. Bursa length 1062-1204 μm, 2.3-3.0 as long as accessory sac . Bursa distally covered with minute pectinations, difficult to see (observed with Differential Interference Contrast only); accessory sac anteriorly with pectinations only. Ductus spermathecae with 4.5 (n=3) convolutions.Associations:Hostplants. Quercus ilex, Q. rotundifolia, Q. suber.
Leafmine. The few mines studied are similar to suberivora, but all almost invisible because they are covered by an uneaten part of the leaf parenchyma; this was also described by Mendes (1913, 1918). It is not yet clear if this character will always separate ilicifoliella from suberivora, or whether it depends on the rather thick leaves of Q. rotundifolia in which we (and Mendes) found the mines.Distribution:Widespread in Portugal and Spain, particularly inland, but probably less common than suberivora. In France (new record) known from old specimens along the Atlantic coast near Bordeaux and in the Hérault and the Côte d’Azur near Cannes; to be expected along the Italian Riviera and in North Africa. Often sympatric with S. suberivora. Frequently found in mountains; recorded from sea level up to 2200 m in the Sierra Nevada.
Life cycle:Life-history. Larvae have been collected in February and March. Adults have been collected from June to early September, voltinism unknown.
Citation:This taxonomic description is based on Van Nieukerken (2003).
EOL Text
Barcode of Life Data Systems (BOLDS) Stats
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Specimens with Barcodes: 3
Species With Barcodes: 1
Stigmella ilicifoliella is a moth of the Nepticulidae family. It is widespread in Portugal and Spain. In France, it is known from old specimens along the Atlantic coast near Bordeaux and in the Hérault and the Côte d’Azur near Cannes.
The wingspan is 6-6.6 mm. Adults are on wing from June to early September.
The larvae feed on Quercus ilex, Quercus ilex rotundifolia and Quercus suber. They mine the leaves of their host plant. The mine consists of an irregular, broad corridor with a broad frass line that almost fills the gallery, leaving only a narrow transparent zone at either side. Pupation takes place outside of the mine.
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Source | http://en.wikipedia.org/w/index.php?title=Stigmella_ilicifoliella&oldid=613879921 |