Callibaetis camposi Navás 1930

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 : 501-503

Callibaetis camposi Navás 1930

( Figs. 1 A–1G)

Callibaetis camposi Navás 1930d: 19 ; Gillies 1990: 22; Domínguez et al. 2006: 112.

Known stages: I ♀

Diagnosis. Female imago: 1) forewing with pigmented C, Sc and R1 areas ( Fig. 1 B); 2) thick and black cross veins in C and Sc areas ( Fig. 1 F); 3) marginal intercalary veins single; 4) hind wing hyaline ( Fig. 1 G); 5) hind wing with thick cross veins; 6) hind wing with quadrangular costal process; 7) hind wing with intercalary marginal veins ( Fig. 1 G); 8) body covered with brown spots ( Figs. 1 B–1E); 9) anterolateral spot on abdominal terga and sterna present ( Figs. 1 C and 1E).

Redescription. Female imago: Head ( Fig. 1 E). Light brown, covered with brownish spots; compound eyes black. Antenna with brown scape apically; pedicel dark brown apically. Thorax ( Fig. 1 F). Covered with brownish spots, metascutellar protuberance rounded. Leg III, anterior surface covered with brownish spots; tibia light brown, with one dark brown mark at base and another at apex; tarsi light brown, each segment brown apically. Wings. Forewing ( Fig. 1 B) with pigmented C and Sc areas; some areas of Radial 1 pigmented; veins light brown; thick and black cross veins in C, Sc and R1 areas; stigmatic area with six cross veins touching Sc vein; marginal intercalary veins single; length of each intercalary vein 0.47 × distance between adjacent longitudinal veins; length of forewing about 2.4 × width. Hind wing ( Fig. 1 G) hyaline, with 13 cross veins; one to three intercalary marginal veins; costal process quadrangular. Abdomen ( Figs. 1 B–1E). Terga. Yellowish, covered with brown spots, brown medially, forming longitudinal pale line; one spot anterolaterally. Sterna. Yellowish, covered with brown spots, with one mark anterolaterally. Caudal filaments lost.

Comments. The only known specimen is in very poor condition; however, it is easy to observe the black and thick cross veins in the C, Sc and R1 areas, which are conspicuous but not exclusive to this species (also present in C. (C.) radiatus and C. viviparus ). A number of characteristics are shared by these three species, such as anterolateral spots on the abdominal terga and sterna; pigmented C, Sc and R1 areas; hind wing with many thick cross veins; hind wing with quadrangular costal process; and abdomen covered with spots.

Based on re-evaluation of the morphology, we cannot distinguish between the female imagoes of C. camposi , C. (C.) radiatus and C. viviparus . Synonymizations are not proposed, because the delimitations of species are better investigated when nymphs and male imagoes are studied (see Cruz et al. 2016). Only C. (C.) radiatus is described based also on nymphs and male imago. In order to avoid unnecessary taxonomic acts, we consider it prudent to await the discovery and description of the unknown stages of C. viviparus and C. camposi before making any taxonomic hypotheses.

Although the species of the genus Callibaetis have a history of vague type locales, the collection of new specimens at the type locale of C. viviparus is achievable, and also of C. camposi , but with less probability.

We designate the unique known specimen of C. camposi as the lectotype. Material examined. Callibaetis camposi , female imago (lectotype by present designation, dry), ECUADOR, Guayaquil, i.1930, Campos leg, n° 75–5308, MZB.

Distribution. Ecuador: Guayaquil.

Figures

FIGURE 1. Callibaetis camposi female imago (lectotype). A. labels; B. dorsal view; C. detail of abdomen; D. detail of body in lateral view; E. detail of body in lateral view; F. detail of wing base; G. drawing of hind wing.