Campsurus machado Lima, Nascimento, Luiza-Andrade, Miranda, Lima, Almeida, Hamada & Cruz, 2025, sp. nov.
Creators: name: De Lima, Claudia R. T.
name: Nascimento, Stênio R. S.
name: Luiza-Andrade, Ana
name: Miranda, Margarida Vilaça
name: Lima, Lucas R. C.
name: Almeida, Marciaandreia De Gois
name: Hamada, Neusa
name: Cruz, Paulo Vilela
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Ephemeroptera
Polymitarcyidae
Campsurus
Campsurus machado

description: Campsurus machado sp. nov. De Lima, Cruz & Hamada
(Figures 8A–I; 9A–C)
Type Material. Holotype: male imago (INPA) from Brazil; Rondônia; Machadinho D’oeste, Machado River, 2 November waterfall, S08°54’27.77”, W062°10’36.53”, 23.viii.2016, P. V. Cruz, N. Hamada, cols. Paratypes: 3 male imagos (1 at INPA, 2 at ENT-UNIR), same data as holotype.
Diagnosis. Male imago. 1) sternum IX with posterior margin triangular, elongated and sclerotized (Figs. 8C, F and G); 2) pedestal touching basally; inner projection subtriangular, short and robust, longer than wide; outer projection reduced, tapering towards the apex (Fig. 8G, 9A); 3) base of each penis subtrapezoid (Figs. 8E and F, 9A); 4) main lobe of penis sclerotized, with basal half expanded laterally, similar to ears, with fold facing dorsally (Figs. 8C–F, 9A–C); 5) secondary lobe vestigial (Figs. 8C–F, 9A and B).
Description. Male imago. Length (n= 4, mm): body, 10.01–11.2; fore wing 10.6–11.4; hind wing 4.9–5.5 (none of the caudal filaments of the four species are completely intact). General coloration yellowish (Figs. 8A and B). Head yellowish, slightly shaded with gray between ocelli. Antennae whitish (Fig. 8A). Thorax. Pronotum translucent; meso and metanotum yellowish with shaded sutures; parapsidal suture and area between posteroscutal protuberances shaded; pros- meso and metasternum yellowish; mesofurcasternum yellowish, inner margin of the mesofurcasternal plate diverging on posterior 1/2 (Figs. 8A and B). Legs whitish. Wings. Forewing with membrane hyaline, area between veins C, Sc and R pigmented with white from the distal half; veins whitish; cross veins whitish. IMP1 connected directly to MP; ICuA1 connected directly to ICuA2. Hindwing with whitish veins. Abdomen whitish translucent, yellowing gradually from the terga VII–X (Fig. 8A). Abdominal sterna whitish medially, sterna VII–X yellowish (Fig. 8B). Genitalia. Sternum IX with posterior margin sclerotized, triangular and elongated (Figs. 8C and F, 9A and C); pedestal touching basally; inner projection subtriangular, short and robust, longer than wide; outer projection reduced, tapering towards the apex (Fig. 8G, 9A); forceps whitish; base of each penis subtrapezoid; main lobe of penis sclerotized, with basal half expanded laterally, similar to ears, with fold facing dorsally, sharply tapering towards the apex, curved ventrally; secondary lobe vestigial on inner margin of main lobe (Figs. 8C–F, 9A–C). Paraproct subquadrate, large and not protruding (Figs. 8H and I). Caudal filaments translucent whitish.
Female imago. unknown.
Etymology. Name of the river in which the species was collected. Name in apposition.
Distribution. Rondônia — Brazil.
description: Published as part of De Lima, Claudia R. T., Nascimento, Stênio R. S., Luiza-Andrade, Ana, Miranda, Margarida Vilaça, Lima, Lucas R. C., Almeida, Marciaandreia De Gois, Hamada, Neusa & Cruz, Paulo Vilela, 2025, Three New Species of Campsurus Eaton, 1868 (Ephemeroptera: Polymitarcyidae) and a List of Polymitarcyidae Banks, 1900 from Rondônia State, Brazil, pp. 505-522 in Zootaxa 5584 (4) on page 514, DOI: 10.11646/zootaxa.5584.4.3, http://zenodo.org/record/14853566