Stigmella expressa Remeikis & Stonis,

Stonis, Jonas R., Diškus, Arūnas, Remeikis, Andrius, Karsholt, Ole & Torres, Nixon Cumbicus, 2017, Illustrated review of the leaf-mining Nepticulidae of the central Andes (Peru and Bolivia), Zootaxa 4257 (1), pp. 1-70: 21

publication ID 10.5281/zenodo.557156

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scientific name

Stigmella expressa Remeikis & Stonis

sp. nov.

6. Stigmella expressa Remeikis & Stonis  , sp. nov.

( Figs 2View FIGURES 1 – 8, 9View FIGURES 9 – 11, 32View FIGURE 32, 37View FIGURE 37, 43–48View FIGURES 43 – 48, 100, 101View FIGURES 100 – 103)

Type material. Holotype: ♂, PERU, Dept. Ayacucho, 25 km W Puquio, Senal Cerro Palmaderas , 3370 m, 10– 12.iii.1987, O. Karsholt, genitalia slide no. RA 545♂ ( ZMUC)  .

Other material (not type). 2 ♀, PERU, Dept. Ayacucho, 35 km W Puquio, elevation 3370 m, 10.iii.1987, O. Karsholt, genitalia slide nos RA 546♀, RA 547♀ ( ZMUC). 

Diagnosis. Belongs to the Stigmella expressa  group. The combination of very long vinculum, gnathos with two closely juxtaposed processes, large apical processes of valva, and narrow uncus distinguishes S. expressa  sp. nov. from all other members of the group, except the most similar S. pseudorobusta Remeikis & Stonis. From  the latter new species differs in very long vinculum in the male genitalia and in ductus spermathecae without coils in the female genitalia.

Male ( Fig. 32View FIGURE 32). Forewing length 3.0– 3.1 mm; wingspan 6.5–6.7 mm. Head: palpi white; frontal tuft white with some pale brown piliform scales; collor weakly developed, composed of some lamellar grey-white scales; scape cream, glossy; antenna longer than half the length of forewing; flagellum with 37 segments, gloosy grey, with some purple iridescence. Thorax, tegula and forewing concolorous, pale grey with some pale yellow tinge, gloosy; underside of forewing grey-brown, without spots or androconia. Hindwing pale grey with some pale yellow tinge on upper side and underside, without spots or androconia; its fringe pale grey cream. Legs grey cream, darkened with some dark grey-brown scales on upper side, particularly on forelegs. Abdomen dark grey, glossy on upper side, grey cream, shiny on underside; tufts short, pale grey; genital segments grey cream.

Female. Slightly smaller than males: forewing length about 2.5 mm; wingspan about 5.5 mm. Flagellum with 27 segments. Abdomen pale grey-brown to brownish cream on upper side, cream on underside.

Male genitalia ( Figs 43–48View FIGURES 43 – 48). Capsule much longer (360 µm) than wide (160 µm). Vinculum with small rounded lateral lobes and very long ventral plate. Uncus narrowing distally, with three small lobes. Gnathos with two slender, closely juxtaposed caudal processes and laterally widened plate. Valva 205–210 µm long, 60 µm wide, with two very large apical processes and slightly bulged and rounded (with no pointing corners) inner lobe; transtilla with long triangular sublateral processes. Juxta membranous. Phallus ( Fig. 47View FIGURES 43 – 48) 220 µm long, 75 µm wide; vesica with two large cornuti.

Female genitalia ( Figs 100, 101View FIGURES 100 – 103). Total length 705–715 µm. Anterior and posterior apophyses almost equal in lenght; anterior apophyses very broad proximally, strongly narrowing (pointed) distally; posterior apophyses very slender. Vestibulum broad, without sclerites. Corpus bursae with long, heavily folded distal part and oval-shaped, 315 µm long, 265 µm wide basal part; pectinations comb-like, distintive; signa absent. Accessory sac wide but very short; ductus spermathecae without convolutions. Abdominal apex broadly rounded.

Bionomics Adults fly in March. Otherwise biology unknown.

Distribution ( Fig. 9View FIGURES 9 – 11). This species occurs in the high Peruvian Andes ( Peru: Ayacucho Departamento) at altitudes about 3370 m.

Etymology. The species name is derived from Latin expressus (dictinct, prominent) in reference to the expressive male genitalia.


Zoological Museum, University of Copenhagen