Callibaetis (Callibaetis) willineri Navás 1933

Cruz, Paulo Vilela, Salles, Frederico Falcão & Hamada, Neusa, 2017, Additions and corrections to the systematics of mayfly species assigned to the genus Callibaetis Eaton 1881 (Ephemeroptera: Baetidae) from South America, Zootaxa 4231 (4), pp. 500-534 : 527

Callibaetis (Callibaetis) willineri Navás 1933

( Figs. 20 A– 21I)

Callibaetis willineri Navás 1933: 115 ; Gillies 1990: 30; Domínguez et al. 2006: 117; Nieto 2008: 240; Cruz et al. 2014: 63. Callibaetis alegre Traver 1944: 45 . (syn. by Gillies 1990)

Known stages. I ♀♂, N

Diagnosis. Male imago: 1) dorsal portion of turbinate eyes oval ( Fig. 20 H); 2) dorsal portion of turbinate eyes in lateral view without constriction; 3) dorsal portion of turbinate eyes stalk height 0.75 × height of dorsal portion; 4) turbinate portion of compound eyes (in lateral view) with anterior and posterior margins divergent; 5) forewing hyaline ( Fig. 21 G); 6) marginal intercalary veins paired ( Fig. 21 G); 7) hind wing hyaline ( Fig. 21 H); 8) costal process of hind wing rounded; 9) marginal intercalary veins on hind wing absent ( Fig. 21 H); 10) abdominal terga VII – X darker ( Fig. 20 H); 11) abdominal sterna covered with spots, all sterna with one medial mark on anterior margin ( Fig. 20 G); 12) abdominal sterna with pair of medioanterior and medioposterior sigilla weak pigmented ( Fig. 20 G); 13) forceps segment I wide at base ( Fig. 21 I); 14) forceps segment III oval ( Fig. 21 I).

Female imago: 1) forewing with C and Sc areas pigmented overpassing R1, after R2 pigmentation with large degree of intensity ( Figs. 21 A, 21C, 21E); 2) marginal intercalary veins paired ( Figs. 21 A, 21C, 21E); 3) hind wing usually with one brown mark near costal process ( Figs. 21 B, 21D); 4) costal process of hind wing rounded ( Figs. 21 B, 21D); 5) marginal intercalary veins on hind wing absent ( Figs. 21 B, 21D, 21F); 6) abdominal terga I –VIII with anterolateral spot, terga II – IX with medial longitudinal mark, terga III, V and VII laterally with inverted V mark ( Figs. 20 A, 20C, 20E); 7) abdominal sterna covered with spots, with one medial mark on anterior margin ( Figs. 20 B, 20D, 20F); 8) abdominal terga with medial longitudinal mark ( Figs. 20 B, 20D, 20F).

Mature nymph: 1) maxillary palp shorter than apex of galea-lacinia (Fig. 80 in Nieto 2008); 2) below maxillary palp insertion on outer margin without tuft of robust spine-like setae (Fig. 80 in Nieto 2008); 3) paraglossa with row of spine-like setae on ventral surface (Fig. 81 in Nieto 2008); 4) segment III of labial palp apically rounded (Fig. 81 in Nieto 2008); 5) metanotum without spines; 6) foretarsus anterior surface without spine-like setae (Fig. 82 in Nieto 2008); 7) hind claw denticles smaller than foreclaw denticles (Fig. 84 in Nieto 2008).

Comments. The nymphs of C. (C.) willineri and C. (C.) zonalis are similar, but they can be differentiated by the length of the maxillary palp, which is shorter than the galea-lacinia in C. (C.) willineri and longer in C. (C.) zonalis . Cruz et al. (2014) equivocally presented a female C. (C.) willineri labeled as C. (C.) guttatus (see more comments about similar species and its differentiation in C. (C.) guttatus and C. (C.) jocosus ).

We present photographs of the female imago and male imago ( Figs. 20 A–20H).

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

Material examined. One female imago, URUGUAY, San Gregorio , Ar. Orillo Rio Uruguay , 29.xi.1959, A. Mesa y San Martin, C. S. Carbonell coll., MZB ; one nymph and one female imago, URUGUAY, Flores, Ruta 14, Km 235, Gruta del Palacio , 16.v.2009, E. Morelli and C. Molineri cols.; one female imago, ARGENTINA, La Plata city, light of living room, N. Hamada coll., INPA ; two females and one male imago, BRAZIL, Rio Grande do Sul, Pelotas , 14.vi.2011, INPA ; four female reared, BRAZIL, Santa Catarina, Iraní - Ponte Serrada (Lake next to Gas station ), BR 282, 26°18’11.4” S / 53°37’01.6” W, 649 m alt., 17.ix.2011, P.V. Cruz and N. Hamada cols., INPA ; one female reared, BRAZIL, lake in Valcir Rodrigues farm, Derrubadas , 27°16’52.4” S / 53°49’17.0” W, 29.ix. 2011, 429m, P.V. Cruz and R. Boldrini cols., INPA ; one male and female reared, BRAZIL, Rio Grande do Sul, Balneário das fontes, lake next to swimming pool, Derrubadas , 27°15’28.4” S / 53°52’33.4” W, 29.ix. 2011, 421 m. alt., P.V. Cruz and R. Boldrini cols., INPA ; one female reared, BRAZIL, Paraná, PR 170,estrada de terra, Rondon farm, General Carneiro Pedra , 26°21’28.8” S / 51°22’21.5” W, 04.x.2011, 1059 m. alt., P.V. Cruz and R. Boldrini cols., INPA .

Distribution. Argentina: Buenos Aires. Brazil: Paraná; Santa Catarina; Rio Grande do Sul. Uruguay: Flores.