Callibaetis ( Callibaetis ) guttatus Navás 1915

Callibaetis ( Callibaetis) guttatus Navás 1915 View in CoL

( Figs. 4 View FIGURE 4 A–5D)

Callibaetis guttatus Navás 1915b: 120 View in CoL ; Gillies 1990: 25; Da-Silva 1991: 346; Domínguez et al. 2006: 113; Nieto 2008: 232; Salles et al. 2010: 302; Lima et al. 2012: 306; Cruz et al. 2014: 30, Angeli et al. 2015: 199 View Cited Treatment .

Callibaetis apicatus Navás 1917: 189 . (syn. by Gillies 1990)

Callibaetis bruchius Navás 1920b: 55 . (syn. by Gillies 1990)

Callibaetis zonatus Navás 1929: 224 . (syn. by Gillies 1990)

Known stages. I ♀♂, N

Diagnosis. Male imago: 1) dorsal portion of turbinate eyes oval; 2) dorsal portion of turbinate eyes in lateral view without constriction; 3) dorsal portion of turbinate eyes stalk height 1.9× height of dorsal portion; 4) turbinate portion of compound eyes (in lateral view) with anterior and posterior margins divergent; 3) forewing hyaline or with C, Sc, R1 and posterior margin areas with large marks; 4) marginal intercalary veins paired; 5) hind wing hyaline or with basal mark; 6) costal process of hind wing rounded; 7) marginal intercalary veins on hind wing present; 8) abdominal terga III, V and VII with lateral marks; 9) abdominal sterna with pair of medioanterior and medioposterior sigilla without pigment; 10) forceps segment I wide at base; 11) forceps segment III oval.

Female imago: 1) forewing at least with C, Sc, R1 and posterior margin areas with marks, maximal degree of pigmentation with seven complete and transversal bands ( Fig. 5 View FIGURE 5 C); 2) marginal intercalary veins paired ( Fig. 5 View FIGURE 5 C); 3) hind wing hyaline or with marks at base and middle ( Fig. 5 View FIGURE 5 D); 4) costal process of hind wing rounded; 5) marginal intercalary veins on hind wing present ( Fig. 5 View FIGURE 5 D); 6) abdominal terga II, III, V and VII with inverted V mark laterally ( Fig. 5 View FIGURE 5 A); 6) abdominal sterna with pair of medioanterior and medioposterior sigilla without pigment ( Fig. 5 View FIGURE 5 B); 7) abdominal terga and sterna with few or without spots ( Figs. 5 View FIGURE 5 A and 5B); 8) abdominal sterna medially on anterior margin without one large spot ( Figs. 5 View FIGURE 5 A and 5B); 9) abdominal terga without medial longitudinal mark ( Figs. 5 View FIGURE 5 A and 5B).

Mature nymph: 1) maxillary palp subequal in length than galea-lacinia; 2) below maxillary palp insertion on outer margin without tuft of robust spine-like setae (Fig. 29 in Nieto 2008); 3) paraglossa with row of spine-like setae on ventral surface (Fig. 30 in Nieto 2008); 4) segment III of labial apically rounded (Fig. 30 in Nieto 2008); 5) metanotum without spines; 6) foretarsus anterior surface without spine-like setae; 7) mid and hind claw denticles smaller than foreclaw denticles (Fig. 33 in Nieto 2008).

Comments. Nieto (2008) described variation in the fore- and hind wings of this species.

In the present work, the specimens illustrated in Figures 20 View FIGURE 20 , 21 View FIGURE 21 a, 21b, 23, 24a and 24b in Nieto (2008) were examined. We conclude that they belong to C. ( A.) fasciatus based on having forewing with three or four transverse bands of pigmentation, apical band transverse to posterior margin (see also Cruz et al. 2014 and comments for C. ( A.) sellacki herein).

Callibaetis ( C.) guttatus is similar to C. ( C.) zonalis , C. ( C.) willineri and C. ( C.) jocosus . All four species share an inverted “V” mark on female abdominal terga III, V and VII and variable pigmentation on the female forewings. The female imago of C. ( C.) guttatus can be differentiated from C. ( C.) jocosus by the abdominal terga and sterna having few or no spots ( Figs. 5 View FIGURE 5 A and 5B); from C. ( C.) willineri by the abdominal sterna lacking one large spot medially, on the anterior margins ( Figs. 5 View FIGURE 5 A and 5B); and from C. ( C.) zonalis by abdominal terga without medial longitudinal mark ( Figs. 5 View FIGURE 5 A and 5B).

We present figures of the types of the two synonymized species ( Figs. 4 View FIGURE 4 A–4D) and newly collected specimens from Brazil ( Figures 5 View FIGURE 5 A–5D).

The specimens studied by Navás (1915b) from Prov. de Buenos Aires, Argentina, were not found, thus a lectotype was not designated.

Material examined. Male imago ( type of Callibaetis apicatus ), ARGENTINA, Buenos Aires, 15.v.1915, MZB ; one female imago ( type of Callibaetis zonatus ), ARGENTINA, Alta Gracia , 17.ii.1929, MZB ; one female imago ( Callibaetis guttatus ), ARGENTINA, Alta Gracia , 27.vi.1926, C. Brush det., MZB ; one nymph, ARGENTINA: Tucumán, Depto. Tafí Viejo, Raco (km 19), A8 Palangana , 24.xi.2001 , C. Molineri coll.; one female imago reared, BRAZIL, Espírito Santo state, São Mateus, Rio São Mateus , 02.x.2007 , F. F. Salles coll., INPA.

Distribution. Argentina: Tucumán; Misiones; Buenos Aires; Alta Gracia. Brazil: Ceará; Espirito Santo; Rio de Janeiro; Pernambuco.