Anacroneuria piranga, Castillo-Velásquez & Gonçalves & Correia & Viana & Rippel & Bonfá-Neto & Sperber & Salles, 2023

Castillo-Velásquez, R. M., Gonçalves, M. C., Correia, M. C. Dias, Viana, A. D. L., Rippel, M. L. S., Bonfá-Neto, P., Sperber, C. F. & Salles, F. F., 2023, Stoneflies left over from a mining disaster: new species and records of Perlidae (Plecoptera) from the Doce River basin, southeastern Brazil, Zootaxa 5360 (3), pp. 409-418 : 415-417

Anacroneuria piranga sp. nov. Castillo-Velásquez, Gonçalves & Salles

Fig. 5A–G , 6 urn:lsid:zoobank.org:act:9D139905-969E-4DA2-8179-B1058243D85B

Male adult. Habitus. Forewing length 8–10 mm. General color brown in dorsal view and amber in ventral view ( Fig. 5A ). Head amber, postfrontal area, clypeus and frons brown, M-line amber. Antennae brown, with yellow outer margin on the scape, pedicel, and the first eight to nine flagellomeres. Palpi brown. Pronotum brown, with two longitudinal light bands and uneven light rugosities ( Fig. 5B ). Wings with membrane brown, except for pale marks, one close to the forewing base, other at the joint of ScP and RA on fore and hindwings; veins dark brown ( Fig. 5C ). Legs brown; hind femur with a subbasal light yellow band; tibiae of all legs amber at base. Thorax amber with sternal sulci brown. Abdominal terga and sterna amber, sternum IX uniformly covered with bristles. Cerci with articles dark brown at base, progressively changing to a bicolor (apex brown, amber) towards the middle; apex of cerci broken ( Fig. 5D ). Hammer roundly tapered and slightly flattened at the apex ( Fig. 5D ). Penial armature in ventral view ( Fig. 5E ) with a pair of membranous subapical vesicles and two flattened and slightly curved hooks that cross each other forming an “x” with acute apices; in dorsal view ( Fig. 5F ), penial armature bottle-shaped, apex ending in two notches and bottleneck-shaped base of hooks corrugated; keel, in lateral view ( Fig. 5G ), not curved, flattened and with the apex pointed.

Female adult. Unknown.

Nymph. Unknown.

Remarks. The color of the adult resembles those of several species of the genus. The penial armature of A. piranga sp. nov., in lateral view, resembles A. annulicauda Stark & Kondratieff, 2004 , but differs in the shape of the keel. In the new species, the keel is not curved but flattened, with the apex pointed. In A. annulicauda , it is slightly rounded at the apex, not pointed. The shape of the hooks, on the other hand, is more similar to A. atrifrons Klapálek, 1922 , but are thinner in the new species and lack teeth.

Etymology. The specific name makes reference to the river where the specimens were collected. The term “Piranga”, means red, and comes from Tupi, the original language of several Brazilian native tribes ( Carvalho 1987).

Habitat. The sampling site is located approximately 3 km west downstream from the Brecha Hydroelectric Plant in an area with native riparian vegetation on the riverbank, with discontinuous stretches due to anthropic intervention. The river has poorly developed rapids and a greenish color on the bottom, which is covered by mats of algae and slime, and a combination of stones and gravel; aquatic vegetation is absent ( Fig. 6 ).

Material examined. Holotype ♂: BRA, MG, Guaraciaba , Piranga River, 20°32’46.30”S, 42°59’25.25”W, 14–15.i. 2022, 526 m a.s.l., Pennsylvania trap, A.Viana, P. Bonfá & P. Rodrigues, ( PL00187 ) . Paratype one ♁: same data as holotype, ( PL00188 ) .

Figures

FIGURE 5. (A–G): Anacroneuria piranga sp. nov. male. A. Habitus; B. Head and pronotum; C. Forewing and hindwing; D. Male sternum 9 and hammer; E. penial armature, ventral view; F. penial armature, dorsal view; G. penial armature, lateral view. Scales—Fig. 5: A and C. 2 mm; B and D. 1 mm; E, F and G. 0.2 mm.

FIGURE 6. Photographs of the habitat of Anacroneuria piranga sp. nov. located on the Piranga River, Minas Gerais, Brazil.