Stegosatyrus imbrialis (Weeks, 1901) Weeks, 1901

Zacca, Thamara, Mielke, Olaf H. H., Pyrcz, Tomasz W., Casagrande, Mirna M., Freitas, André V. L. & Boyer, Pierre, 2013, Stegosatyrus, a new genus of Euptychiina from the grasslands of neotropical realm (Lepidoptera: Nymphalidae: Satyrinae), Zootaxa 3682 (2), pp. 331-350 : 334-337

Stegosatyrus imbrialis (Weeks, 1901) n. comb.

( Figs 1–4 , 17, 20 , 23–32 , 84 )

Epinephele imbrialis Weeks, 1901: 81 ; Weeks 1905: 43; Weymer 1911: 237; Gaede 1931: 236.

Euptychia biocellata Godman, 1905: 187 , 190, pl. X, fig. 8; Hayward 1958: 228; Forster 1964: 134 (as syn. of Megisto imbrialis ).

Euptychia subandina Jörgensen, 1935: 92 , pl. II, fig. 4; Forster 1964: 134 (as syn. of Megisto imbrialis ).

Megisto imbrialis (Weeks) ; Forster 1964: 134.

Pampasatyrus imbrialis (Weeks) ; Lamas 1996: 53; Lamas & Viloria 2004: 217.

Type locality. Bolivia, [province of Cochabamba], Alisuni.

Taxonomic history. Epinephele imbrialis Weeks, 1901 was described based on four syntypes from the type locality. Godman (1905) described Euptychia biocellata based on three syntypes from Tanampaya, Bolivia. In 1935, Jörgensen described Euptychia subandina without specifying the exact number of specimens examined [syntypes] collected in Catamarca (El Suncho and Esquina Grande), Argentina. Forster (1964) proposed a new combination transferring Epinephele imbrialis Weeks, 1901 to Megisto Hübner , [1819]. According to Forster (op. cit.), Euptychia biocellata Godman, 1905 and Euptychia subandina Jörgensen, 1935 are synonyms of Megisto imbrialis . Lamas (1996) transferred it to Pampasatyrus .

Diagnosis. The chromatic pattern on the dorsal face of wing of Stegosatyrus imbrialis n. comb. resembles Pampasatyrus gyrtone , being easily distinguished by HWV, by the absence of ocelli and presence of two light bands, one on the discal region between Rs-2A and other in the marginal region. Together with these characteristics, S. imbrialis n. comb. differs from the other species of the genus by the third segment of labial palp being longer than the first segment, and posterior portion of aedeagus is bipartite.

Redescription. MALE ( Figs 1–2 , 17, 20 , 23–30, 32 ). Head ( Figs 17, 20 ): Antenna light brown with 34 flagellomeres; frons with a tuft of small and elongated light brown scales; labial palp with elongated black and white or light brown scales on the ventral face, third segment with a pointed apex, larger than the first segment. Thorax: with dark brown scales and a few elongated medium brown scales, prothoracic leg with femur and tibia of same length and tarsus 2/3 the length of tibia. Abdomen: dorso-laterally dark brown and ventrally light brown. Wings ( Figs 1–2 , 32 ): dorsally dark brown; ventral face light brown. FW (length: 17–19 mm): external margin with dark brown fringes; R1 appears on the discal cell, before dcs vein; sub-marginal region with a double black ocellus between R5-M3 externally ringed with a yellow line and two white pupils; ventrally, marginal region with slight dark brown line between R4-2A, parallel to the margin, that connects with discal line surrounding the ocellus at R4-CuA2 up to the discal region. HW: external margin without indentations, but with fringes similar to the FW; dorsal face with ocellus between CuA1-CuA2; ventral face with a lighter band in the discal region and the other band in the marginal region between Rs-2A; lighter from the base of the wing base to the inner margin; sub-basal region with dark brown line between Sc+R1 and 2A. Genitalia ( Figs 23–30 ): tegumen with pronounced median concavity in the anterior portion; ventral arms of tegumen straight with posterior dilatation in the median region; appendix angular reduced and curved; saccus elongated with 2/3 the length of gnathos; apex of valvae with little crenulation; aedeagus slightly longer than the valvae and thin, with anterior portion lanceolate and posterior portion dorsally bipartite.

FEMALE ( Figs 3–4 , 31 ). Similar to male. Genitalia ( Fig. 31 ): Papillae anales of same length as tergite VIII; sternite VIII separated from tergite VIII; lamella antevaginalis sclerotized; ductus bursae sclerotized; signa 1/3 the length of bursa copulatrix.

Distribution ( Fig. 84 ). Occurs in Bolivia (Cochabamba) and Argentina (Jujuy, Salta, Tucumán and Catamarca), between 800–2,100 meters. Flies in January, February, April, May, July (probably also in March and June).

Host plant. Poaceae ( Hayward 1960, 1969).

Examined material. BOLIVIA, Cochabamba: Via Cochabamba (El Fuerte), 2,000m, 13, 27.VIII.2000, Wojtusiak leg. (DZ 21.563); Santa Cruz: Samaipata (El Fuerte), 2,000m, 73 and 2Ƥ, 27.VIII.2000, T. Pyrcz & J. Wojtusiak leg. ( MZUJ, DZUP 21.423); ARGENTINA, Catamarca: Singuil, 2,100m, 33, without date, without collector ( MLPA); Tucumán: 13, V.1947, Breyer leg. (DZ 21.332), San Javier, 1,200m, 1 without abdomen 20.I.1970, Mielke leg. (DZ 21.563), 53, without date, without collector ( MLPA 025/1178, MLPA 025/1180, MLPA 025/1183, MLPA 025/1190, MLPA 025/1192), Racó 43, without date, without collector ( MLPA 025/1179, MLPA 025/1184, MLPA 025/1185, MLPA 025/1187), Villa Nougues 13 21.I.1931, without collector ( MLPA 025/ 1194), Salta: 3 without abdomen, 14.IV.1969, Heimlich leg. (DZ 24.912, DZ 21.570, DZ 21.577), 800m, 13, 5.VI.1933, without collector ( MLPA 025/1176), Valderramas 23, XII.1935, without collector ( MLPA 025/1177, MLPA 025/1181), Jujuy: Zapla, 13, without date, without collector ( MLPA 025/1186), 13, 10.1939, without collector ( MLPA 025/1188).

Male lectotype: E. imbrialis A. G. Weeks Jr , Bolívia / Alezuni, Bolívia, Aug. 8, 1899, Coll. A. G. Weeks, Jr./ type / 160/ 7758/ Lectotypus / Epinephele imbrialis Weeks, 1901 , Zacca, Mielke & Pyrcz det. 2013.

Remarks. The lectotype designation was based on the photograph of the male syntype of Epinephele imbrialis deposited in The British Museum of National History (BMNH), available on the website “Butterflies of America ” (http://butterfliesofamerica.com/L/ Nymphalidae .htm). The remaining specimens (syntypes) are designated paralectotypes. This will prevent any future confusion regarding the identity of this taxon, and will thus maintain taxonomic stability as recommended by the International Commission on Zoological Nomenclature (1999: 83) in their Code (Recommendation 74A).

Figures

FIGURES 84. Geographical distribution of Stegosatyrus, n. gen.

FIGURES 1 – 16. Adults of Stegosatyrus, n. gen.. 1 – 2. S. imbrialis, male: 1. Dorsal, 2. Ventral; 3 – 4. S. imbrialis, female: 3. Dorsal, 4. Ventral; 5 – 6. S. ocelloides, male: 5. Dorsal, 6. Ventral; 7 – 8. S. ocelloides, female: 7. Dorsal, 8. Ventral; 9 – 10. S. periphas, male: 9. Dorsal, 10. Ventral; 11 – 12. S. periphas, female: 11. Dorsal, 12. Ventral. 13 – 14. S. hemiclara n. sp., holotype, male: 13. Dorsal, 14. Ventral; 15 – 16. S. hemiclara n. sp., allotype, female: 15. Dorsal, 16. Ventral.

FIGURES 17 – 22. Cephalic appendages of Stegosatyrus. 17 – 19. Antenna: 17. S. imbrialis, 18. S. ocelloides, 19. S. periphas; 20 – 22. Labial palpi: 20. S. imbrialis, 21. S. ocelloides, 22. S. periphas. (Scale = 1 mm).

FIGURES 23 – 32. Stegosatyrus imbrialis. 23 – 30. Male genitalia (scale = 1 mm): 23. Lateral; 24 – 25. Valvae: 24. External view, 25. Inner view; 26 – 28. Aedeagus: 26. Lateral, 27. Dorsal, 28. Ventral; 29 – 30. Tegumen, uncus and gnathos: 29. Dorsal, 30. Ventral; 31. Female genitalia (scale = 1 mm); 32. Wings venation, male (scale = 2 mm).