Anacroneuria itajaimirim Bispo & Froehlich, 2004

Almeida, Lucas Henrique De, Duarte, Tácio & Bispo, Pitágoras Da Conceição, 2024, Complementary studies of the Perlidae (Insecta: Plecoptera) fauna from the Paranapiacaba Mountains using DNA barcode data, Zootaxa 5496 (4), pp. 500-508 : 502-505

Anacroneuria itajaimirim Bispo & Froehlich, 2004

( Figure 2 )

Anacroneuria itajaimirim Bispo & Froehlich 2004: 105 , description; Froehlich 2010: 159, catalog; Almeida & Bispo 2020: 15, pictures and COI sequences.

Material examined. BRAZIL, São Paulo: Iporanga, Parque Estadual Intervales, Três Córregos , 16.vii.2023, Almeida & Taniguti col., 4 nymphs .

Nymph description. General color brown in dorsal view and light yellow in ventral view. Head bicolored with subtly distinguishable light-brown M line ( Figure 2A ). Labrum brown; frontoclypeus brown with an ochraceous anterior band ( Figure 2A ). Posterior part of the head light yellow with posterior end of occiput light brown; eyes and ocelli black ( Figure 2A ). Scape and pedicel brown, flagellum light brown ( Figure 2A ). Labium brownish ( Figure 2E ). Mandibles brown and laterally dark brown with a dense brush of bristles in molar area; five teeth, the first being smaller than the others, the second, third and fourth similar in size ( Figure 2F ). Maxillae brown ( Figure 2G ). Pronotum brown with median line and rugosities lighter ( Figure 2A ). Mesonotum and metanotum brown with light yellow pattern; wing pads brown with light yellow apex ( Figure 2B ). Legs ochraceous; femur covered with sparse bristles, anteriorly and posteriorly with high density of thick bristles; tibia posteriorly with well-developed band of hairs ( Figure 2D ). Abdomen brown ( Figure 2C ); cercus light brown with a ring of long bristles on each segment, segments differ in shape and size from base to apex ( Figure 2H ). Thoracic gills: ASC1, PSC1, AT2, AT3, PT3, and A1 (sensu Shepard & Stewart 1983).

Measurements. Nymph (n=4). Mean head width = 3.55 mm; mean body length = 11.84 mm; mean length of antenna = 7.89 mm; mean length of the cercus = 9.56 mm.

Remarks. The nymph of A. itajaimirim exhibits some similarities to the nymph described as A. debilis by Avelino-Capistrano et al. (2011). Both species have a pattern of spots on the head and pronotum, characterized by a dark spot running from the frontoclypeal region to near the ocelli. However, there are notable differences between the two species. In A. debilis , the posterior edge of the dark spot begins anterior to the compound eyes and extends posteriorly to the ocelli, forming an almost V-shaped spot (see figure 2 in Avelino-Capistrano et al. 2011). On the other hand, in A. itajaimirim , the dark spot has constrictions that give it a different shape, ending and forming a Ushaped spot anterior to the ocelli ( Figure 2A ).

Figures

FIGURE 2. Anacroneuria itajaimirim nymph. (A) head and pronotum; (B) mesonotum and metanotum; (C) abdomen; (D) leg; (E) labium; (F) mandible; (G) maxilla; (H) cercus. Scales: 1 mm.