Corydalus diasi Navás, 1915

Machado Constancio, Pedro Henrique & Martins, Caleb Califre, 2024, First record of Corydalus diasi Navás, 1915 (Megaloptera: Corydalidae) from Rio de Janeiro state, Brazil, Revista Chilena de Entomología (Rev. Chil. Entomol.) 50 (1), pp. 51-56 : 52-55

Corydalus diasi Navás, 1915

( Figs. 1 A-D, 2A-F, 3)

Diagnosis (after Contreras-Ramos 1998). Male ( Figs. 1A, C ): Head pale to dark brown, unpatterned. Mandibles short with developed dentition or elongated with reduced dentition. Antennae brown, infuscate at apex, filiform, moderately thick. Forewings with light brown membrane, longitudinal veins dark brown, and crossveins strongly black marked. Genitalia barely sclerotized. Tergite IX subquadrate with fine setose. Ectoproct long, larger at the base, with 2/3 of its length more narrowed than apex; apex can portray a projection orientated mesally or completely incised. Sternite IX subquadrate with posterior margin flattened or portraying an incised projection. Gonostylus IX subclavate, elongate, reaching at least 1/2 of the ectoproct length. Gonocoxites X slightly convex with short anterolateral projections or highly convex with fully developed anterolateral projections. Female ( Figs. 1B, D ): Morphologically similar to the male, excepting the terminalia and genitalia structures, and mandibles, which are short with well-developed three pre-apical teeth, and inner protrusion basally to first pre-apical tooth.

Remarks. Variations in mandible size were observed among the collected males, the specimen from Nova Iguaçu had female-like mandibles, while those from Itatiaia exhibited elongated ones. Another distinctive variation was noted at the tip of the ectoproct, where specimens from Itatiaia featured a small projected apex ( Fig. 2A ), while those from Nova Iguaçu exhibits an incised apex ( Fig. 2F ). Additionally, the sternite IX’s posterior margin from Nova Iguaçu males have an incised projection ( Fig. 2F ), whereas those from Itatiaia have a flattened one ( Fig. 2B ). Although gonocoxites X shape variations were already observed on C. diasi , none of these variations were noted from Rio de Janeiro specimens ( Figs. 2 D-F). This new record expands the distribution of C. diasi from seven states (Bahia, Ceará, Goiás, Minas Gerais, Rio Grande do Sul, São Paulo, Tocantins) and Federal district to eight Brazilian states plus Federal district ( Fig. 3 ). It is quite likely that C. diasi occurs in other states besides those previously mentioned, especially in the central and northeastern regions. Future studies focusing on investigating unidentified specimens in scientific collections and collecting in undersampled areas will fill the gaps regarding the distribution potential of C. diasi .

Material examined. Corydalus diasi . 1 male, 2 females. BRAZIL. Rio de Janeiro, Itatiaia, Parque Nacional do Itatiaia, Sede do Parque , 22°27’09.4”S, 44°36’25.6”W, 17.xi.2021, Pano Branco, cols. Antunes A., Ferreira A.L., Alexandre M.S.L, Clarkson B. & Gonçalves C.C. [ MNRJ] ; 1 male. BRAZIL. Rio de Janeiro, Macaé, Sana, Cabeceiras do Sana , 22°17’29.9”S 42°09’39.9”W, 17.i.2022, Coleta Ativa, col. Guimarães, S. [ MNRJ] ; 1 male, 1 female. BRAZIL. Rio de Janeiro, Nova Iguaçu, Reserva Biológica Federal do Tinguá, Alojamento , 22°35’10.4”S, 43°26’18.7”W, 20.ix.2023, Coleta Noturna, cols. Monné, Jardins & Quijada [ MNRJ] .

Figures

Figure 1. Corydalus diasi Navás, 1915 from Itatiaia municipality, Rio de Janeiro. A-C. Dorsal view of the male. B-D. Dorsal view of the female. Scale: 10 mm. / Figura 1. Corydalus diasi Navás, 1915 del municipio de Itatiaia, Río de Janeiro. A-C. Vista dorsal del macho. B-D. Vista dorsal de la hembra. Escala: 10 mm.

Figure 2. Corydalus diasi Navás, 1915 genital structures. A-D. Itatiaia male genitalia. A. Dorsal view. B. Ventral view. C. Lateral view. D. Gonostylus 10. E. Female genitalia. F. Nova Iguaçu’s male genitalia, ventral view. Abbreviations: ect, ectoproct; Gst9, gonostylus 9; Gcx9-Gcx10, gonocoxites 9 and 10, Gst10, gonostylus 10; S8-9, sternites 8-9; T8-9, tergites 8-9. Scale: 1 mm. /Figura 2. Estructuras genitales de Corydalus diasi Navás, 1915. A-D. Genitalia del macho de Itatiaia. A. Vista dorsal. B. Vista ventral. C. Vista lateral. D. Gonostilo 10. E. Genitalia de la hembra. F. Genitalia del macho de Nova Iguaçu, vista ventral. Abreviaturas: ect, ectoprocto; Gst9, gonostilo 9; Gxt9, gonocoxito 9, Gst10, gonostilo 10; S8-9, esternitos 8-9; T8-9, terguitos 8-9. Escala: 1 mm.

Figure 3. Distributional map of Corydalus diasi Navás, 1915 from Rio de Janeiro state. / Figura 3. Mapa de distribución de Corydalus diasi Navás, 1915 en el estado de Río de Janeiro.