Campsurus mirim, Pantoja & Viana & Salles, 2023

Pantoja, Gabriel M., Viana, Ana D. L. & Salles, Frederico F., 2023, A new species of Campsurus Eaton, 1868 (Ephemeroptera: Polymitarcyidae) from the Doce River Basin, Brazil, Zootaxa 5352 (1), pp. 145-150 : 147-150

Campsurus mirim sp. nov. ( Figs. 3–5 )

Type material. Holotype: ♁ imago in alcohol, Brazil, Espírito Santo State, Linhares municipality, Lagoa Juparanã Mirim (Lagoa Nova), S19°19’49.0”, W40°10’12.3”, 32 m, 13.ix.2022, Viana, A.D.L., Bonfá, P., Ataide, A. col. ( UFVB) . Paratypes: 26 ♁ imagos, same data as holotype (16 at UFVB, 10 at MNRJ) .

Diagnosis. The male imago of C. mirim sp. nov. can be distinguished from other species of the genus by the following combination of characteristics: small to medium size (body 7.3 mm, forewings 6.1 mm); blackish pigments on dorsum of head widely and strongly marked in fresh material ( Fig. 3A ); abdominal color pattern with pale transverse dashes on terga III–VII ( Figs. 3C and 3D ); posterior margin of sternum IX triangular at middle ( Fig. 5A ); pedestals with both posterior margins (inner and outer) approximately of the same length, both acute ( Fig. 5A ); penes relatively wide and large, ventrally curved on apical ½ and with apex of main lobe slightly twisted, gonopore not visible ( Figs. 5A and B ).

Male imago ( Figs. 3–5 ). Length (mm): body, 7.3; forewing, 6.1; hind wing, 2.9; fore leg, 3.06. General coloration yellowish white with gray markings dorsally. Head ( Figs. 3A–B ) heavily washed with black on dorsum, especially at base of ocelli, scape and pedicel slightly washed with black, flagellum hyaline. Thorax ( Figs. 3A–B ). Pronotum translucent shaded with black on anterior portion and on lateral and posterior margins of posterior portion; medially with blackish medial line well marked. Meso- and metanota yellowish white diffusely washed with black; black marks more heavily on anteronotal impression, longitudinal median suture, and area between posteroscutal protuberance. Pleura and sterna yellowish white except on prothorax shaded purplish grey. Forelegs shaded with purplish black, lighter on tarsi and even lighter on apex of claws; vestiges of middle and hind legs yellowish white, except for black middle coxa. Wings ( Fig. 4 ). Membrane hyaline, except ¾ of C and Sc areas tinged with purple; veins slightly tinged with purple at base, becoming lighter towards outer margin. Abdomen ( Figs. 3C–D ) whitish translucent, shaded with black on terga: terga I–III lighter, terga VIII–X darker; thin medial line on terga V–X; pale lateral transversal band present on terga III–VII. Genitalia ( Fig. 5 ) whitish yellow, forceps translucent white, slightly tinged with purple at base, sclerotized apex of penes yellowish brown. Posterior margin of sternum IX triangular at middle. Penis curved ventrally, especially at apical ½; main lobe of penis with apex twisted outwards and with its prominent dorsal (posterior) margin very sclerotized; secondary lobe membranous and cylindrical; gonopore not visible. Pedestal short and somewhat flattened, inner-posterior margin well developed and broadly acute, outerposterior margin equal in length to outer margin, with angle more acute. Caudal filaments whitish translucent.

Female imago and nymph. Unknown.

Etymology. From the tupi-guarani language, meaning small. An allusion to the size of the species, especially when compared to the relative larger C. major , and also an allusion to one of the names of the type-locality, the lake Juparan„ Mirim. Distribution. Brazil: Espírito Santo State ( Fig. 1 ).

Campsurus mirim sp. nov. would key out in couplet 3(2) of the key proposed by Molineri & Salles (2017). In order to add the new species to that key, and also to include the recently described C. fortuitus Cruz, Molineri & Hamada, 2022 , which would also key out in the same couplet, we propose the following change:

3(2) Forewing smaller than 7 mm ............................................................................ 4

3’. Forewing larger than 9 mm ................................................ couplet 4 of Molineri & Salles (2017)

4(3). Penes blade-like, not curved; posterior margin of sternum IX slightly concave..................................... 5

4’. Penes curved ventrally; posterior margin of sternum IX triangular at middle.......................... C. mirim sp. nov.

5(4). Penes with inner distal margin of main lobe curved outwards........................................... C. fortuitus

5’. Penes with distal margin of main lobe rounded, not curved............................................. C. povilla

Figures

FIGURE 1. Distribution of Campsurus mirim sp. nov. A, Map of South America with white rectangle highlighting the State of Espírito Santo (thick lines separating Brazil from other countries; narrow lines within Brazil delimiting states; narrow lines outside Brazil delimiting South American countries); B, Map of Espírito Santo with white circle showing the known distribution of Campsurus mirim sp. nov.

FIGURE 3. Campsurus mirim sp. nov. male imago (holotype): A, head and thorax, dorsal view; B, head and thorax, lateral view; C, abdomen, dorsal view; D, abdomen, lateral view.

FIGURE 4. Campsurus mirim sp. nov. male imago (holotype): Fore and hind wing.

FIGURE 5. Campsurus mirim sp. nov. genitalia of male imago (holotype): A, genitalia, ventral view; B, penes lobes, ventral view; C, genitalia, lateral view. Abbreviations: IX, sternum IX; ml, main lobe; sl, secondary lobe; p, pedestal.