Anacroneuria debilis Pictet 1841
Creators: name: Silva, Fernanda Avelino Capistrano Da
name: Barbosa, Leandro Silva
name: Almeida, Gisele Luziane De
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlidae
Anacroneuria
Anacroneuria debilis

description: Anacroneuria debilis (Pictet, 1841)   
(Figs. 1–10)  
 Perla (Perla) debilis Pictet, 1841: 255, pl. 26, Fig. 4.   
 Neoperla debilis (Pictet, 1841). Claassen, 1940: p. 173.   
 Anacroneuria debilis (Pictet, 1841). Zwick, 1972: p. 173, Fig. 3. Anacroneuria debilis (Pictet, 1841). Froehlich, 2002: p. 72, Fig. 2–3. Anacroneuria debilis (Pictet, 1841). Nessimian et al., 2010:   
 Material examined. Brazil. Rio de Janeiro. Pedra Branca State Park. Rio Figueira, 22°56’13.9”S 43°26’27.”W, 199 m, 29.v.2009, FACS & GLA leg., #659, 1 n; #662, 1 n; 09.vi.2008, #654, 1 m, 1 f; #706, 1 n, #708, 16 n; 12.viii.2008, #730, 1 n, #731, 2 n, #732, 1 n, #733, 10 n; 15.x.2008, #744, 7 n, #745, 14 n, #747, 2 n; 21.v.2008, #775, 5 n; #777, 5 n. Riacho Manoel Justino, 22°55’59.4”S 43°26’53”W, 201 m, 01.ii.2009, #657, 8 n; #658, 2 n; Riacho do Quilombo, 22°56’08.2”S 43°26’21”W, 200 m, 29.v.2009, #660, 1 n; 13.viii.2008, #714, 3 n. Rio Grande, 22°56’05.7”S 43°26’54.6”W, 202 m, 26.v.2008, #762, 1 f; 27.vi.2008, #707, 4 n; 09.vi.2008, #753, 1 f, # 763, 1 f, #764, 1 f; 12.viii.2008, #717, 2 n; #718, 8 n; #719, 1 n; 15.x.2008, #738, 1 n. Riacho da Padaria, 22°56’11.1”S 43°26’35.4”W, 199 m, #610, 12.i.2009, 13 n; #611, 20.i.2009, 8 n; #638, 05.iii.2009, 1 n; #646, 20.i.2009, 1 n; #652, 12.i.2009, 1 n; #726, 03.ix.2008, 1 n; #742, 10.x.2008, 1 n; #743, 10.x.2008, 4 n.   
 Nymph. General color brown in dorsal view and pale in ventral view (Fig. 1). Head brown, with light areas between clypeus and frons and posterior to coronal suture (Fig. 2). M-line present, but not distinct. Ocelli black. Eyes black. Antennae uniformly yellow. Glossa, paraglossae and labial palps whitish-yellow (Fig. 3). Mandibles yellow with outer margin dark-brown; teeth sharp and dark-brown; row of bristles along margin of internal face and another parallel row on ventral surface (Figs. 4–5). Maxillae yellow, bidentate, teeth sharp and reddish-brown, a row of four to seven setae below second tooth (Fig. 6). Pronotum oval (Fig. 2); dark-brown along margin and paler towards center where pale rugosities form a distinctive color pattern. Mesonotum, metanotum, and abdomen with many bristles. Legs with row of long, fine setae dorsally on femur and tibia (Figs. 7–8); stout spines sparsely scattered on femur and distributed in longitudinal rows along tibiae. Abdominal terga reddish-brown; sterna pale, posterior margin with unbroken line of setae, line broken in female nymphs (Fig. 9). Cerci reddish-yellow at base, paler apically; each segment with stout spines whirled about posterior margin (Fig. 10).   
 Measurements. Nymph (n=134): head width, 0.85–3.68 (mean= 2.14 mm); head length, 0.7–2.76 (mean= 1.71 mm); pronotum width, 1.05–3.93 (mean= 2.33 mm); pronotum length, 0.52–2.05 (mean= 1.29 mm); abdomen length, 1.45–7.53 (mean= 3.13 mm); total length, 4.16–18.1 (mean= 8.39 mm). These values represent a range of development, the highest values being of pre-emergent nymphs.   
 Remarks. Anacroneuria debilis nymphs are similar to A. baumanni (Mexico) and A. segnini (Venezuela) based on the pattern design of the head and pronotum. However, A. debilis differ from both species by the presence of a row of fine, long bristles along the tibia and by rows of stout spines on the basal third of the cercus.   
 Distribution. Argentina: Missiones, Entre Rios; Brasil: Rio Grande do Sul, Santa Catarina, Paraná, Rio de Janeiro, Espírito Santo; Paraguai: Paraguaí.
description: Published as part of Silva, Fernanda Avelino Capistrano Da, Barbosa, Leandro Silva & Almeida, Gisele Luziane De, 2011, The nymph of Anacroneuria debilis (Pictet, 1841) (Plecoptera: Perlidae), pp. 59-63 in Zootaxa 2882 on pages 60-62, DOI: 10.5281/zenodo.277585