Callibaetis (Abaetetuba) pollens Needham & Murphy 1924

(Figs. 9 A–10H)

Callibaetis pollens Needham & Murphy 1924: 51; Nieto 2008: 235; Domínguez et al. 2006: 116; Boldrini et al. 2012: 92; Lima et al. 2012: 306; Cruz et al. 2014: 56; Boldrini & Cruz, 2014: 4.

Known stages. I ♀♂, N.

Diagnosis. Male imago: 1) dorsal portion of turbinate eyes oval (Figs. 9 A, 10A); 2) dorsal portion of turbinate eyes in lateral view with constriction (Fig. 10 B); 3) dorsal portion of turbinate eyes stalk height 1.3 × height of dorsal portion (Fig. 10 B); 4) turbinate portion of compound eyes (in lateral view) with anterior and posterior margins divergent; 5) forewing hyaline (Fig. 9 B); 6) marginal intercalary veins single (Fig. 9 B); 7) hind wing hyaline (Fig. 9 B); 8) costal process of hind wing rounded (Fig. 9 B); 9) marginal intercalary veins on hind wing present; 10) abdominal terga on anterior margin with a transversal mark of pigment (Fig. 10 A); 11) abdominal sterna with pair of medioanterior and medioposterior sigilla weak pigmented (Fig. 10 C); 12) abdominal sterna with black anterolateral mark (Fig. 10 C); 13) forceps segment I wide at base, with setae on inner margin (Figs. 9 E, 10G); 14) forceps segment III oval (Figs. 9 E, 10G).

Female imago: 1) head with a Y mark (Fig. 10 D); 2) forewings hyaline (Fig. 161 in Cruz et al. 2014); 3) marginal intercalary veins single (Fig. 161 in Cruz et al. 2014); 4) hind wing hyaline (Fig. 162 in Cruz et al. 2014); 5) costal process of hind wing rounded (Fig. 162 in Cruz et al. 2014); 6) marginal intercalary veins on hind wing present (Fig. 162 in Cruz et al. 2014); 7) abdominal terga reddish brown (Fig. 10 D); 8) abdominal sterna with pair of medioanterior and medioposterior sigilla weak pigmented (Fig. 10 E); 9) abdominal sterna II to IX with black mark (Fig. 10 E).

Mature nymph: 1) distal margin of labrum, medially with row of long and bifid setae (Fig. 43B in Nieto 2008); 2) maxillary palp 1.5 × length of galea-lacinia (Fig. 47 in Nieto 2008); 3) crown of galea-lacinia with three rows of setae; 4) paraglossa with rounded apex (Fig. 48A in Nieto 2008); 5) paraglossa with one tuft of fine and simple setae; 6) metanotum with spines (Fig. 10 H); 7) foretarsus anterior surface without spine-like setae (Fig. 49 in Nieto 2008); 8) hind claw with minute denticles (Fig. 51 in Nieto 2008).

Comments. Cruz et al. (2009, 2014) differentiate C. (A.) pollens and C. (A.) capixaba by the setae on the femur of the nymph (trifid setae absent on the femur of C. (A.) pollens). We studied the same specimens analyzed by Cruz et al. (2009, 2014) and some of those analyzed by Nieto (2008), and observed trifid setae on the femur of C. (A.) pollens. However, the nymphs of both species can be differentiated by the shape of the apex of paraglossa, being round in C. (A.) pollens (Fig. 48A in Nieto 2008) and truncate in C. (A.) capixaba (Fig. 42A in Cruz et al. 2009); and by the number of tufts of fine and simple setae on the apex of the paraglossa, having one in C. (A.) pollens and three in C. (A.) capixaba.

We present figures of the holotype (Figs. 9 A–9E) and more recently collected specimens assigned to C. (A.) pollens (Figs. 10 A–10H) from Brazil.

Material examined. Callibaetis pollens, photographs of the slide of the male imago (holotype), BRAZIL, Mato Grosso do Sul, Corumbá, 14.xii.1919, Cornell University, n° 644; two female imagoes, ARGENTINA, Acheral, Tucumán, Aranillas River, Cruce RP 38, 366 m, 27°06’59.9” S / 65°27’43.9” W, 13.ix.2007, C. Nieto and C. Molineri cols., CZNC; five nymphs, ARGENTINA, Acheral, Tucumán, Aranillas River, Cruce RP 38, 366 m, 27°06’59.9” S / 65°27’43.9” W, 28.vii.2006, C. Nieto and C. Molineri cols., CZNC; one female imago, one male imago, eight nymphs, BRAZIL, Lajeado River, BR 010, under the bridge, Maranhão, 06°04’15.6” S / 47°22’56.6” W, 21.vii.2010, N. Hamada, P.V. Cruz and R. Boldrini cols., INPA; two male imagoes, five nymphs, BRAZIL, Maranhão, Riachão, Riacho Cocal, Cachoeira Santa Bárbara, 07°13’46.2” S / 46°27’24.6” W, 23.vii.2010, N. Hamada, P.V. Cruz & R. Boldrini cols., INPA; two female imagoes, BRAZIL, Maranhão, Farinha River, BR 010, under the bridge, 06°31’47.3” S / 47°28’11.4” W, 22.vii.2010, N. Hamada, P.V. Cruz & R. Boldrini cols., INPA; five male imagoes, seven female imagoes, 12 nymphs, BRAZIL, Ceará, Jaburu River, Ubajara, Distrito da Cachoeira do Boi Morto, 03°52’36.2” S /41°0.1’0.08” W, 26.vii.2010, N. Hamada, P.V. Cruz & R. Boldrini cols., INPA; four nymphs, BRAZIL, Brejinho, near Posto Cachoeira, Bahia, Correntina, 13°43’53.5” S / 45°23’38.1” W, 08.viii.2010, N. Hamada, R. B. Querino & R. Boldrini cols., INPA; eight nymphs, BRAZIL, Bahia, Côcos, Formoso River, highway to Mambaí municipality, 14°40’00.6” S / 45°49’32.3” W, 11.viii.2010, N. Hamada, R. B. Querino & R. Boldrini cols., INPA; five nymphs, 2 female and 1 male (reared), BRAZIL, Mato Grosso do Sul, Bonito, Balneário municipal de Jardim Rio Prata, 21°25’04.3” S / 56°23’24.0” W, 15/iii/2012, P. V. Cruz coll., INPA.

Distribution. Argentina: Tucumán. Brazil: Ceará; Bahia; Goiás; Maranhão; Mato Grosso do Sul; Pernambuco; Piauí; Rondônia; Roraima.