Callibaetis (Abaetetuba) fasciatus ( Pictet) 1843

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 : 235-240

publication ID	https://doi.org/ 10.11646/zootaxa.4250.3.3
publication LSID	lsid:zoobank.org:pub:8D0213F2-B5F7-4CFB-BB3E-637EB6EDB684
DOI	https://doi.org/10.5281/zenodo.6018984
persistent identifier	https://treatment.plazi.org/id/BC7B8E32-FFBE-FFC3-60C5-FE3DCFAF8E1B
treatment provided by	Plazi
scientific name	Callibaetis (Abaetetuba) fasciatus ( Pictet) 1843
status

Treatment

Callibaetis (Abaetetuba) fasciatus ( Pictet) 1843 View in CoL

( Figs 5–8 View FIGURE 5 View FIGURE 6 View FIGURE 7 View FIGURE 8 )

Cloe fasciata Pictet 1843: 262 .

Callibaetis trifasciatus Esben-Petersen 1912: 339 . (syn. by Gillies 1990) Callibaetis fasciatus: Eaton 1883: 197 View in CoL ; Gillies 1990: 23; Domínguez et al. 2006: 113; Cruz et al. 2014: 20.

Known stages. Male and female imagoes, nymph

Diagnoses. Male imago: 1) turbinate eyes with oval dorsal portion ( Fig. 5 View FIGURE 5 A); 2) dorsal portion of turbinate eyes, in lateral view, without constriction; 3) turbinate portion of compound eyes (in lateral view) with anterior and posterior margins divergent; 4) forewing with three or four transverse pigmented bands ( Fig. 5 View FIGURE 5 F); 5) marginal intercalary veins paired ( Fig. 5 View FIGURE 5 F); 6) hind wing with small dashes of pigmentation ( Fig. 5 View FIGURE 5 G); 7) hind wing with a small pointed costal projection ( Fig. 5 View FIGURE 5 G); 8) marginal intercalary veins on hind wing present ( Fig. 5 View FIGURE 5 G); 9) anterior margin of abdominal terga with a transversal mark ( Fig. 5 View FIGURE 5 A); 10) abdominal sterna with strongly pigmented medioanterior and medioposterior sigilla ( Fig. 5 View FIGURE 5 B); 11) forceps segment I wide at base (Fig. 57 in Cruz et al. 2014); 12) segment III of forceps elongated and oval (Fig. 57 in Cruz et al. 2014).

Female imago: 1) forewing with three or four transverse bands of pigmentation ( Fig. 5 View FIGURE 5 H); 2) marginal intercalary veins paired; 3) hind wing with small dashes of pigmentation ( Fig. 5 View FIGURE 5 I); 4) hind wing with a small pointed costal projection ( Fig. 5 View FIGURE 5 I); 5) marginal intercalary veins on hind wing present ( Fig. 5 View FIGURE 5 I); 6) abdominal sterna with strongly pigmented medioanterior and medioposterior sigilla ( Fig. 5 View FIGURE 5 D); 7) abdominal sterna I–IX with one pair of lateral black mark ( Fig. 5 View FIGURE 5 D).

Mature nymph: 1) distal margin of labrum with short, robust and pectinate setae medially ( Fig. 6 View FIGURE 6 B); 2) maxillary palp 1.3× length of galea-lacinia ( Fig. 6 View FIGURE 6 E); 3) one row of setae on basal part of inner-dorsal row of maxilla ( Figs 6 View FIGURE 6 E and similar to 21C); 4) paraglossa with rounded apex ( Fig. 6 View FIGURE 6 G); 5) paraglossa with one tuft of thin setae ( Fig. 6 View FIGURE 6 G); 6) inner margin of labial palp segment III not tapering towards the base ( Fig. 6 View FIGURE 6 G); 7) metanotum without spines; 8) anterior surface of foretarsus with one row stout setae ( Fig. 7 View FIGURE 7 A).

Description. Mature nymph. Length: body, 6.5 mm; cerci, 2.54 mm; paracercus, 2.35 mm (n=1). Head light brownish yellow; turbinate portion of male compound eyes yellowish brown. Antenna with spines and thin setae on flagellum ( Fig. 6 View FIGURE 6 A). Labrum ( Fig. 6 View FIGURE 6 B) maximum length about 1.3× minimum length; anterolateral margins with long and stout setae; distal margin with short, robust and pectinate setae medially; dorsal surface with numerous long and thin setae; dorsal surface, near distal margin, with three robust and long setae; distal margin with one row of stout setae ventrally; ventral surface with short and stout setae near lateral margin. Right mandible ( Fig. 6 View FIGURE 6 D) with 4+3 denticles; margin between prostheca and mola convex; basal half with short and thin setae and pores scattered over dorsal surface. Left mandible ( Fig. 6 View FIGURE 6 C) with 4+3 denticles; margin between prostheca and mola straight; basal half with short, thin setae and pores scattered over dorsal surface. Lingua of hypopharynx ( Fig. 6 View FIGURE 6 F) with apical lobe covered with small setae; short and thin setae scattered over distal margin of lingua and superlingua. Maxilla ( Fig. 6 View FIGURE 6 E) with one row of setae on basal part of inner-dorsal row (similar to Fig. 21 View FIGURE 21 C); medially, on inner margin, with 1+6 stout setae. Maxillary palp short, 1.3× length of galea-lacinia; palp segment II 1.2× length of segment I; outer margin of segment I covered with long and thin setae; inner margin of segment II with thin setae. Labium ( Fig. 6 View FIGURE 6 G) with glossae shorter in length than paraglossae; inner margin of glossae with 7 stout setae; apex with 3–5 long and stout setae; near outer margin with one row of long and stout setae; dorsal surface with one tuft of setae at apex. Paraglossae with rounded apex, with one row of stout setae and with one tuft of setae on inner margin; dorsal surface with numerous long and stout setae; distal margin with two rows of long and stout setae; outer margin with one row of long and stout setae. Labial palp with segment I 0.8× length of segments II and III combined; segment I with micropores; inner margin of segment II with four robust, short and stout setae, and few thin and short setae ( Fig. 6 View FIGURE 6 G); dorsally with row of six short and stout setae; inner margin of labial palp segment III not tapering towards the base; whole margin of labial palp segment III, on dorsal surface, with one row of long and stout setae; inner margin of labial segment III, on ventral surface, with four long and stout setae. Thorax light brownish yellow. Metanotum without spines ( Fig. 8 View FIGURE 8 B). Foreleg ( Fig. 7 View FIGURE 7 A) with black spots at base of femur; ratio 1.5:(0.62 mm):0.8:0.5. Forefemur length about 4.3× maximum width; dorsal margin with one row of short and stout setae; apex of femur with two stout setae; length of setae on dorsal margin about 0.1× maximum width of femur; ventral margin without setae; anterior and posterior surface covered with stout setae; near ventral margin with two rows of stout setae, one trifid and one simple; near dorsal margin with one row of stout setae. Ventral margin of tibia with one row of stout setae; anterior surface with one row of short and stout setae. Ventral margin of tarsus with one row of trifid stout setae ( Fig. 7 View FIGURE 7 C); anterior and posterior surface with one row of stout setae. Claw 0.7× length of tarsus. Hind leg similar to foreleg except femur without trifid setae and claw denticles smaller than foreclaw denticles ( Fig. 7 View FIGURE 7 B). Abdomen ( Fig. 8 View FIGURE 8 C) light brownish yellow. Posterior margin of terga with regular spines ( Fig. 8 View FIGURE 8 A). Surface of sterna with thin setae. Gill I about 1.5 × length of segment II, with two folds. Gill IV as long as length of segments V to VI combined, with two folds. Gill VII as long as length of segment VIII and half of segment IX combined, with one fold. Paraproct ( Fig. 8 View FIGURE 8 D) with 28 marginal spines; surface with micropores and short, thin setae. Paracercus ( Fig. 8 View FIGURE 8 G) with long spines every two segments. Cerci ( Figs 8 View FIGURE 8 E, 8F) with spines on all segments, basal half with long spines every two segments.

Comments. The nymph of C. (Ab.) fasciatus is similar to the nymph of C. (Ab.) sellacki , they can be distinguished by the absence, in C. (Ab.) fasciatus , of spines on posterior margin of metanotum.

Material examined. Three male imagoes, BRAZIL, Rio Grande do Sul, Derrubadas , 27°15’58.76”S / 53°51’50.62”W, lake, 25.x.2008, E. Raimundi coll., INPA GoogleMaps ; one male imago, BRAZIL, Paraná, Rio Branco do Sul, 25°11’42.20”S / 49°18’50.44”W, Gruta de Lancinha , 31.v.1987, DZRJ GoogleMaps ; one male imago reared (with larval and subimaginal exuviae) and one nymph, 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 GoogleMaps ; three female imagoes, BRAZIL, Mato Grosso do Sul, Bonito, Ponte na BR-178, Rio Mimoso , 20°58'21.43"S / 56°32'49.74"W, 15.iii.2012, P. V. Cruz coll., INPA GoogleMaps ; one male and one female imagoes, ARGENTINA, Prov. Corrientes, Parque Nacional Mburucuyá , casca central estancia, 12–14.xii.1999, C. Molineri coll.; three female and one male imagoes, ARGENTINA, Missiones, Parque Prov . Uruguai, Uruzú, Ruta Prov. 19, 7-11.xii.1999, C. Molineri coll.; three female subimagoes ( C. trifasciatus ), ARGENTINA, La Plata, 27.x.1920, Navás det., MZB ; one male imago ( C. trifasciatus ), ARGENTINA, Prov. Buenos Aires Navás det., MZB .