Callibaetis pollens Needham and Murphy, 1924

Cruz, Paulo Vilela, Salles, Frederico Falcão & Hamada, Neusa, 2013, Callibaetis Eaton (Ephemeroptera: Baetidae) from Brazil, Journal of Natural History (J. Nat. Hist.) 48 (11 - 12), pp. 591-660 : 646-648

Callibaetis pollens Needham and Murphy

( Figure 25 )

Callibaetis pollens Needham and Murphy, 1924 ; Domínguez et al., 2006, p. 116; Nieto, 2008.

Known stages: I ♀ ♂, N

Diagnosis

Male imago. (1) Dorsal portion of turbinate eyes oval; (2) forewings hyaline (fig. 37 in Nieto 2008); (3) marginal intercalary veins single (fig. 37 in Nieto 2008); (4) hind wing hyaline; (5) costal process of hind wing compound (fig. 38a in Nieto 2008); (6) abdominal sterna with black mark anterolaterally; (7) forceps segment I wide at base, with setae on inner margin, segment III elongate (fig. 39 in Nieto 2008).

Female imago. (1) Forewings hyaline ( Figure 25B ); (2) marginal intercalary veins single ( Figure 25B ); (3) hind wing hyaline; (4) costal process of hind wing compound ( Figure 25C ); (5) abdominal sterna II to IX with black mark anterolaterally ( Figure 25D ); (6) abdominal terga reddish brown ( Figure 25A ).

Mature nymph. (1) Distal margin of labrum with deep medial emargination, distal margin, medially with row of long and bifid setae (fig. 43a in Nieto 2008); (2) maxillary palp 1.5 × length of galea-lacinia (fig. 47 in Nieto 2008); (3) glossa shorter than paraglossa (fig. 48a in Nieto 2008); (4) segment III of labial palp truncate at apex (fig. 48 in Nieto 2008); (5) mid and hind tarsal claws with two rows of minute denticles (figs. 49, 51 in Nieto 2008); (6) cerci with spines on all segments (fig. 54 in Nieto 2008); (7) terminal filament with spines on all segments.

Comments

The imagos of C. pollens can be easily distinguished from other species in the genus by the forewings hyaline with single marginal intercalary veins; the nymphs can be distinguished from other species in the genus by the mid and hind tarsal claws with two rows of minute spines; labrum with bifid setae medially and posterior margin of metanotum with pointed spines.

Material examined

Two female imagos, ARGENTINA, Acheral, Tucumán, Aranillas River , cruce RP 38, 366 m, (27 ◦ 06 ′ 59.9 ′′ S, 65 ◦ 27 ′ 43.9 ′′ W), 13 / ix / 2007, Nieto and Molineri col. ( 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, Nieto and Molineri col. ( CZNC); one female imago, one male imago, eight nymphs, BRAZIL, Lajeado River , BR010 , under the brigde, Maranhão, (06 ◦ 04 ′ 15.6 ′′ S, 47 ◦ 22 ′ 56.6 ′′ W), 21 / vii / 2010, N. Hamada, P. V . Cruz and R. Boldrini col ( INPA); two male imagos, 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 and R. Boldrini col ( INPA); two female imagos, BRAZIL, Maranhão, Farinha River , BR010 , under the brigde, (06 ◦ 31 ′ 47.3 S, 47 ◦ 28 ′ 11.4 ′′ W), 22 / vii / 2010, N. Hamada, P. V . Cruz and R. Boldrini col ( INPA); five male imagos, seven female imagos, twelve 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 and R. Boldrini col ( 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, Ranise and R. Boldrini col ( INPA); eight nymphs, BRAZIL, Bahia, Côcos, Formoso River , highway to Mambaí county , (14 ◦ 40 ′ 00.6 ′′ S, 45 ◦ 49 ′ 32.3 ′′ W), 11 / viii / 2010, N. Hamada, Ranise and R. Boldrini col ( INPA) .

Distribution

Argentina and Brazil: Mato Grosso do Sul state, Corumbá county ; Maranhão state, Lajeado River, Riachão county, Farinha River ; Ceará state, Ubajara county ; Bahia state, Correntina county, Côcos county .

Figures

Figure 25. (colour online) Callibaetis pollens. (A) female imago dorsal view; (B) female imago forewing; (C) female imago hind wing; (D) female imago ventral view.