Callibaetis (Aiso) calophenigyn, Cruz, Paulo Vilela, Salles, Frederico Falcão & Hamada, Neusa, 2017

Cruz, Paulo Vilela, Salles, Frederico Falcão & Hamada, Neusa, 2017, Four new species of Callibaetis Eaton (Ephemeroptera: Baetidae), nymphal description of Callibaetis (Abaetetuba) fasciatus (Pictet) and keys for South American species of Callibaetis, Zootaxa 4250 (3), pp. 229-261 : 240-241

Callibaetis (Aiso) calophenigyn sp. nov.

( Figs 9–12 )

Callibaetis sp. B: Cruz et al. 2016

Known stages. Female imago, nymph

Diagnoses. Female imago: 1) forewing with red C and Sc areas ( Fig. 9 D); 2) marginal intercalary veins paired ( Fig. 9 D); 3) hind wing hyaline ( Fig. 9 E); 4) costal process of hind wing rounded; 5) marginal intercalary vein on hind wing present ( Fig. 9 E); 4) abdominal terga without pattern ( Figs 9 A, 9B); 5) abdominal sterna with weak pigmented medioanterior and medioposterior sigilla ( Fig. 9 B).

Mature nymph. 1) distal margin of labrum with row of stout setae medially ( Fig. 10 B); 2) maxillary palp 0.9× length of galea-lacinia ( Fig. 10 E); 3) dorsal surface of glossae, near apex, without stout setae ( Fig. 10 G).

Description. Female imago. Length: body, 8 mm; forewing, 7.8 mm; hind wing, 1.6 mm (n=2). Head light brown; compound eyes black. Antenna with scape and pedicel light brown apically. Thorax with anteronotal protuberance, posterior scutal protuberance and scutellum light brown. Anteronotal and metascutellar protuberance rounded. Femora with trachea black pigmented on posterior surface; tibiae light brown without dark brown marks; tarsi light brown. Forewing hyaline; costal and subcostal areas red ( Figs 9 C, 9D); veins red; stigmatic area with 4– 6 cross veins reaching the subcostal vein and 1–2 veins which does not; marginal intercalary veins paired, except between ICuA2 and A; length of each intercalary vein 0.6× distance between adjacent longitudinal veins; length of forewing about 2.7× width. Hind wing ( Fig. 9 E) hyaline with one marginal intercalary vein; costal process rounded. Abdomen ( Figs 9 A– 9C) with terga and sterna light brown, segments VIII–X whitish; sterna with weak pigmented medioanterior and medioposterior sigilla. Cerci, at base, with each second segment red ( Fig. 9 C).

Mature nymph. Length: body, 8 mm; cerci, 5.5 mm; paracercus, 4.8 mm (n=2). Head light brownish. Antenna with spines and thin setae on flagellum ( Fig. 10 A). Labrum ( Fig. 10 B) with maximum length about 1.5× minimum length; anterolateral margins with long and stout setae; distal margin with stout setae medially; dorsal surface with numerous short and thin setae; near distal margin with two pairs of short and stout setae; distal margin with one row of stout setae ventrally; ventral surface with short and stout setae near lateral margin and six to seven stout setae near anterolateral margin. Right mandible ( Fig. 10 C) with 4+3 denticles; margin between prostheca and mola convex; basal half with short, thin setae and pores scattered over dorsal surface. Left mandible ( Fig. 10 D) with 4+3 denticles; margin between prostheca and mola straight; basal half with short and thin setae and pores scattered over dorsal surface. Lingua of hypopharynx ( Fig. 10 F) with apical lobe covered with small simple setae; short and thin setae scattered over inner margin of superlingua. Maxilla ( Fig. 10 E) with one row of setae on basal part of inner-dorsal row (similar to figure 21C); medially, on inner margin, with 1+6 stout setae. Maxillary palp 0.9× length of galea-lacinia; palp segment II 0.8× length of segment I; outer margin of segment I covered with long and thin setae; near outer margin of segment I with short and stout setae; apex of segment I with short and stout setae; inner margin of segment II with stout setae. Labium ( Fig. 10 G) with glossae and paraglossae similar in length; inner margin of glossae with 13 stout setae; apex with 3–5 long and stout setae; outer margin with one row of long and stout setae; dorsal surface with one dense row of long and stout setae near outer margin. Paraglossae with one stout seta at apex; ventral surface with three stout setae; dorsal surface with one row of long and stout setae near inner margin and two rows of long and stout setae near outer margin. Labial palp with segment I 0.9× length of segments II and III combined; ventral surface of segment I with few stout setae; outer margin of segment I with one row of short and stout setae; inner margin of segment II with six short and stout setae, and few thin and short setae, outer margin with few thin and short setae; dorsal surface of segment II with row of ten short and stout setae; ventral surface with numerous thin setae; apex of segment III rounded; whole margin of segment III, on dorsal surface, with stout setae. Thorax light brownish yellow, with brown spots. Metanotum without spines. Foreleg ratio ( Fig. 11 E) 1.5:(0.9 mm):0.6:0.5. Forefemur length about 4.7× maximum width; dorsal margin with few short and stout setae; length of setae on dorsal margin 0.16× maximum width of femur; anterior surface, near dorsal margin, with one row of stout setae; anterior surface, near ventral margin with two rows of short and stout setae, bifid on basal half and simple on apical half. Ventral margin of tibia with one row of stout setae; anterior surface with short and stout setae. Ventral margin of tarsus with one row of stout setae, and one row of short, trifid and stout setae ( Fig. 11 C). Claw 0.74× length of tarsus ( Fig. 11 B). Mid and hind legs similar to foreleg except femora and tarsi without bifid or trifid stout setae; femora with one row of stout setae on middle and claw denticles smaller than foreclaw denticles ( Fig. 11 A). Abdomen ( Fig. 12 A) light brownish yellow. Posterior margin of terga with regular spines ( Fig. 12 B); surface covered with numerous brown spots. Surface of sterna covered with thin setae. Gill I subequal to length of segment II, with three folds. Gill IV equal to length of segments V and VI combined, with two folds. Gill VII subequal to length of segment VIII and half of segment IX combined, with one fold. Paraproct ( Fig. 12 C) with ca. 32 marginal spines. Paracercus and cerci with long spines every two segments ( Figs 12 D, 12E).

Comments. The nymph of C. (Aiso) calophenigyn sp. nov. is similar to the nymph of C. (Aiso) itannae Cruz, Salles & Hamada ; and can be distinguished by the absence of stout setae on dorsal surface of glossa in C. (Aiso) calophenigyn sp. nov. Female imago of C. (Aiso) calophenigyn sp. nov. can be distinguished from the others species in the genus by the forewing with red C and Sc areas.

Etymology. The specific name is a free union of the three Greek words, calo = beautiful, pheni = deep red and gyn = woman or female, in allusion to the beauty of color in female.

Material examined. Holotype: Female imago reared (with nymphal and subimaginal exuviae), BRAZIL, Santa Catarina, Iraní - Ponte Serrada (lake next to the gas station), BR 282, 26° 18’11.4”S / 53° 37’01.6” W; 649 m alt.; 17.ix.2011; P. V. Cruz, N. Hamada, A. M.O. Pes and R. Boldrini cols., INPA . Paratype: one female imago reared, same data as holotype.

Distribution. Brazil: Santa Catarina.

Figures

FIGURE 9. Callibaetis (Aiso) calophenigyn sp. nov. female imago. A. dorsal view; B. ventral view; C. natural color; D. forewing; E. hind wing. Black arrow: marginal intercalary vein.

FIGURE 10. Callibaetis (Aiso) calophenigyn sp. nov. nymphs. A. antenna; B. labrum (left v. v., right d. v.); C. right mandible; D. left mandible; E. maxilla; F. hypopharynx; G. labium (left v. v., right d. v.)

FIGURE 11. Callibaetis (Aiso) calophenigyn sp. nov. nymph. A. detail of hind claw; B. detail of foreclaw; C. detail of ventral margin of foretarsus; D. detail of anterior surface near ventral margin; E. foreleg.

FIGURE 12. Callibaetis (Aiso) calophenigyn sp. nov. nymph. A. dorsal view of exuviae; B. posterior margin of terga IV; C. paraproct; D. cercus; E. paracercus.