Ischnodemus nigromaculatoides, Dellapé & Melo, 2022

Dellape, Pablo M. & Melo, Maria C., 2022, Four new species of Ischnodemus (Hemiptera, Heteroptera, Blissidae) and additional records from Argentina, Deutsche Entomologische Zeitschrift 69 (2), pp. 283-295 : 283

Ischnodemus nigromaculatoides sp. nov.

Figs 2A , 4A , 5A , 6A

Ischnodemus lactipennis : Slater and Wilcox (1969: 229) (in part).

Ischnodemus nigromaculatus : Slater and Wilcox (1969: 233) (in part).

Ischnodemus nigromaculatus (misidentification): Dellapé et al. (2015: 12).

Lsid link.

http://lsid.speciesfile.org/urn:lsid:Lygaeoidea.speciesfile.org:TaxonName:518388.

Type material.

Holotype ARGENTINA • male, Chaco, 3.3 km SW Makallé; 16-XII-2018; -27.1782235, -59.2362379; Dellapé, P.M. col.; MLP he-10540 (Fig. 2A ). Paratypes: ARGENTINA - Chaco Prov. • 1 male; Resistencia; 2-XII-[19]39; Birabén- Bezzi cols.; Ischnodemus var. B near Ischnodemus lactipennis Slater & Wilcox, 1969; MLP he-10541 • 1 female; 12 km SE of Pampa del Indio, Prov. Rd. 3,125 m; 26°06.419'S, 59°49.599'W; 15 Dec. 2018; Henry, T.J. col.; USNM - Córdoba Prov. • 1 female; 5 km S Valle Hermoso; 31°11'11"S, 64°30'28"W; 7-III-2006; Carpintero- Dellapé cols.; MLP he-10542 • 1 male; Monte Cristo; 29-XII-1944; Martínez, A. col.; Ischnodemus nigromaculatus Slater & Wilcox, 1967; MLP he-10543. - Corrientes Prov. • 1 female; Colonia Pellegrini; 4-XII-2001; Dellapé, P.M. col.; MLP he-10544- Formosa Prov. • 2 females; rt. 33, 4.6 km SW Estanislao del Campo; - 25.078°S, 60.139°W; 14-XII-2018; Dellapé & Melo cols.; MLP he-10545, he-10546 • 1 male; P.N. Rio Pilcomayo; 25.121°S, 58.183°W; 12-XII-2018; Dellapé & Melo cols.; MLP MLP he-10547 • 1 male: 3 km S of Pozo de Tigre, Prov. Rd. 26, elev. 200 m: 25°04.256'S, 60°06.165'W; 14-XII-2018; Henry T.J. col.; USNM - Misiones Prov. • 1 female; Parque Prov. Moconá, Obeia Negra; 2-IV-2012; Dellapé, P.M. col.; MLP he-10548 • 1 female; R.P. 2; 27°11.455'S, 54°00.768'W; 4-III-2010; Dellapé, P.M. col.; MLP he-10549.

BRAZIL - Pernambuco St. • 2 females; Tupanatinga, Parna do Catimbau, ICMBIO, terra 2; 8°33'54.9"S, 37°14'20.2"W; 730 m; 14-III-2019; Gonçalves, C.C., Takiya, D.M. & Carrenho, R. cols.; Malaise grande; MLP he-10550 he-10551 • 1 female; Tupanatinga, Parna do Catimbau, terreno do Icmbio, terra 2; 8°33'54.9"S, 37°14'20"W; 730 m; 14-III-2019; Gonçalves, C.C. col.; sweep; MLP he-10552.

Description

(male holotype). (Fig. 2A ) Total length 5.31. Head, pronotum and scutellum shallowly punctate except posterior one fourth of pronotum; sparsely clothed with short decumbent, semidecumbent, and erect setae.

Head grey-black and pruinose, except irregular areas shiny; clypeus brown apically and shiny; antenniferous tubercles shiny. Head length 0.65, head width 0.88, interocular space 0.55. Vertex flat, eyes ovoid, and set well away from anterolateral pronotal angles. Ocelli relatively large, interocellar space 0.34, closer to anterior margin of pronotum than to the eyes. Labium short attaining anterior margin of mesosternum. Labial segments length: I 0.26, II 0.36, III 0.30, IV 0.32. Antennae dark brown, apex of pedicellus and basiflagellomere paler; with abundant semierect setae; scapus slightly surpassing apex of clypeus, length of segments: scapus 0.20 pedicellus 0.48, basiflagellomere 0.46, distiflagellomere 0.66.

Pronotum (Fig. 4A ) slightly sinuate laterad, narrowing gradually from mid-length of anterior lobe to collar; transverse impression shallow, nearly obsolete; posterior margin concave. Pronotum length 0.96, pronotum width 1.08. Anterior pronotal lobe grey-black, pruinose with intermixed small shiny spots, collar shiny medially; posterior pronotal lobe dark brown and shiny except humeral lobes lateral to scutellum pruinose. Metathoracic scent gland auricle slightly produced anteriorly, yellowish basally and brown dorsally. Scutellum grey-black, pruinose, with a longitudinal median fringe without punctures. All femora moderately incrassate, mutic. Coxae and femora dark brown, femora paler apically; trochanters, tibiae and tarsi light brown. All legs with abundant decumbent short setae. Hemelytra reaching anterior area of 6th abdominal tergum, length 3.16. Hemelytra creamy white, except apical area of corium orange brown, and with dark brown as follows: basal 1/4 and apex of clavus, apical half of inner margin and posterior margin extending to outer margin of corium adjacent to the orange macula, and a large irregular median macula on membrane contacting posterior margin of corium next to orange macula. Sterna pruinose, except a rectangular shiny area on mesosternum.

Abdomen brown, darker from segment VII to apex. Male genitalia: Pygophore (Fig. 5A ) dorsal aperture elongate, anterior margin subtriangular, elongate, inner projections short, posterior margin deeply concave medially. Parameres: Blade long, outer projection small (Fig. 6A ).

Etymology.

The specific epithet refers to the similarity of the species to I. nigromaculatus ; the Greek suffix ‘-oides’ means 'similar to’.

Distribution.

Known from several localities in northern Argentina, Brazil and Paraguay.

Measurements of paratypes

(min-max, mean). Males (n = 3): Total length 5.56-6.06, 5.64. Head length 0.68-0.78, 0.70, head width 0.83-0.99, 0.90, interocular space 0.52-0.60, 0.57, interocellar space 0.31-0.34, 0.33. Labial segments length: I 0.26-0.28, 0.27, II 0.32-0.36, 0.35, III 0.30-0.34, 0.31, IV 0.26-0.32, 0.30. Antennal segments length: scapus 0.18-0.22, 0.21 pedicellus 0.54-0.56, 0.53, basiflagellomere 0.48-0.50, 0.48, distiflagellomere 0.64-0.70, 0.67. Pronotum length 0.96-1.14, 1.02, pronotum width 1.04-1.33, 1.13. Hemelytra length 3.20-3.56, 3.31.

Females (n = 5): Total length 6.13-7.44, 6.48. Head length 0.70-0.81, 0.76, head width 0.83-1.01, 0.90, interocular space 0.52-0.62, 0.57, interocellar space 0.36-0.39, 0.37. Labial segments length: I 0.28-0.40, 0.33, II 0.32-0.44, 0.38, III 0.32-0.40, 0.36, IV 0.32-0.40, 0.36. Antennal segments length: scapus 0.18-0.24, 0.21 pedicellus 0.46-0.54, 0.50, basiflagellomere 0.44-0.52, 0.47, distiflagellomere 0.60-0.70, 0.65. Pronotum length 1.01-1.30, 1.08, pronotum width 1.12-1.46, 1.23. Hemelytra length 3.12-3.92, 3.48.

Remarks.

This new species corresponds to the variety " a " of I. nigromaculatus mentioned by Slater and Wilcox (1969) that included specimens from Argentina and Brazil, but was not included in their type series because they expressed doubt about their conspecificity. From their material we studied the male from Córdoba, Monte Cristo, which is included here as a paratype of the new species. Also, the male paratype from Chaco, mentioned by Slater and Wilcox (1969) as variety " b " of I. lactipennis , together with four other specimens from Argentina, Brazil and Paraguay, have a large dark membrane marking that is absent in I. lactipennis s. str. We therefore treat these specimens as I. nigromaculatoides sp. nov. Lastly, the female from Obeia Negra, identified as I. nigromaculatus in the inventory from Moconá Provincial Park (Misiones, Argentina) by Dellapé et al. (2015), pertains to this new species as well.

Figures

Figure 2. Dorsal habitus. A. Ischnodemus nigromaculatoides sp. nov.; B. Ischnodemus formosus sp. nov. Scale bars: 1 mm.

Figure 4. Head and pronotum. A. Ischnodemus nigromaculatoides sp. nov.; B. Ischnodemus formosus sp. nov.; C. Ischnodemus infernalis sp. nov.; D. Ischnodemus nigromaculatus Slater & Wilcox, 1969 (HNHM). Scale bars: 1 mm.

Figure 5. Pygophore, posterodorsal view. A. Ischnodemus nigromaculatoides sp. nov.; B. Ischnodemus formosus sp. nov.; C. Ischnodemus infernalis sp. nov.; D. Ischnodemus correntinus sp. nov. Scale bar: 0.5 mm.

Figure 6. Right paramere. A. Ischnodemus nigromaculatoides sp. nov.; B. Ischnodemus formosus sp. nov.; C. Ischnodemus infernalis sp. nov.; D. Ischnodemus correntinus sp. nov. Scale bar: 0.25 mm.