Stonis, Jonas R., Diškus, Arūnas, Remeikis, Andrius, Davis, Donald R., Solis, M. Alma & Torres, Nixon Cumbicus, 2016, The first record of Baccharis L. (Asteraceae) as a host-plant genus for Nepticulidae (Lepidoptera), with description of new Stigmella species from South America, Zootaxa 4136 (1), pp. 101-128: 123-124

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7. Stigmella  species 609

( Figs 3View FIGURE 3, 2View FIGURES 1 – 2, 54View FIGURES 51 – 54, 89–96View FIGURES 89 – 96)

Material examined. ♀, ECUADOR: Pichincha Province, 11 km NW Alóag, 0° 26 ' 48 "S, 78 ° 37 ' 32 "W, elevation 3165–3200 m a.s.l., mining larvae on Baccharis latifolia (Ruiz & Pav.) Pers.  , 10.ii. 2014, leg. A. Remeikis & J. R. Stonis, genitalia slide no. RA 610 ♀ ( ZMUC); leaf-mines with mining larvae (not reared), same locality, 12.i. 2005, field card no. 4807, A. Diškus & J. R. Stonis.

Diagnosis. This species most resembles other species feeding on Baccharis latifolia  by the female genitalia (males unknown): Stigmella latifoliae  sp. nov. and S. baccharicola  sp. nov. It differs from these species in a large accessory sac and slender anterior apophyses. It differs from S. baccharicola  in a yellow larva; larva of of this species is green.

Male. Unknown.

Female ( Fig. 96View FIGURES 89 – 96) (n= 1). Head: antenna slightly longer than half the length of forewing; flagellum dark grey or fuscous.Thorax, tegula and forewing fuscous. Fascia of forewing near postmedian. Abdomen dark brown to fuscous (also see Remarks).

Female genitalia ( Fig. 54View FIGURES 51 – 54). Total length about 680 µm. Abdominal apex broad (105–130 µm), rounded. Apophyses anteriores slender, same length as apophyses posteriores. Vestibulum relatively broad, without sclerites. Accessory sac large, folded. Ductus spermathecae narrow, with 1 coil (chitinized convolution). Corpus bursae broad (335 µm), rounded, covered with numerous comb-like pectinations but without signa.

Bionomics. Larvae mine in leaves ( Figs 2View FIGURES 1 – 2, 92, 94, 95View FIGURES 89 – 96). Host-plant: Baccharis latifolia (Ruiz & Pav.) Pers.  ( Asteraceae  ) ( Figs 1View FIGURES 1 – 2, 90View FIGURES 89 – 96). Egg on upper side of leaf. Larva greyish green to green, with brown-green intestine and brown head; mine in January and February (judging on available old leaf-mines, also can mine in September – November). The long sinuous or contorted gallery of leaf-mine with central line of black frass; sometimes frass line varies in width and often fills most of gallery width; therefore leaf-mines not always easily observed; sometimes frass line can be interrupted ( Figs 2View FIGURES 1 – 2, 92, 95View FIGURES 89 – 96); initial part of gallery often follows leaf veins, occassionally starts on underside. Larval exit slit on upper side of the leaf. Cocoon dark beige-brown. Adults emerged in February. Abundant mining in all observed localities in Alóag (Pichincha Province).

Distribution ( Fig. 3View FIGURE 3). This species occurs in cloud forests or related habitats on the western slopes of the equatorial Andes ( Ecuador) at altitudes about 3100–3200 m ( Figs 89, 91View FIGURES 89 – 96).

Remarks. Description of external features are based on completely developed female pupae. This new species, associated with Baccharis latifolia  as a host-plant, is left unnamed until more material will be collected.


Zoological Museum, University of Copenhagen