Belostoma fittkaui De Carlo, 1966

Stefanello, Fabiano, 2021, The new Belostoma fittkaui species group with supplemental descriptions of B fittkaui De Carlo and B. sayagoi De Carlo, Zootaxa 4942 (4), pp. 583-591 : 584-586

Belostoma fittkaui De Carlo

( Figure 2A )

Belostoma fittkaui De Carlo, 1966: 100–101 .

Belostoma fittkaui: Schnack, 1976: 34 .

Supplemental description. Size and shape. Length: male (n=10) = 28.4–34.0, female (n=9) = 28.7–32.4; width: male = 13.8–17.5, female = 14.2–16.4. Body broad.

External morphology. Head: eyes triangular, with lateral margins straight; anteoculus as long as interoculus, about 0.94–1.00× ( Fig. 1C ); vertex with a carina poorly elevated; article II of labium distinctly shorter than III, about 0.62–0.74×. Thorax: prosternal keel quite elevated with apex rounded, projecting forward; pronotum trapezoidal with lateral margins straight and a narrow fold extending to posterior portion; fore femur slender, subequal in width with middle femur; scutellum distinctly carinate. Abdomen: pilosity entirely covering sterna and connexivum, including second through seventh segments.

Male genitalia. Dorsal arms of phallosoma convergent, covering lateral margins of diverticulum and extending to distal portion of diverticulum in dorsal view; phallosoma slightly curved and diverticulum with a poorly developed ventral protuberance in lateral view; diverticulum more elliptical in ventral view.

Diagnosis. Article II of the labium distinctly shorter than III, about 0.62–0.74×, pilosity entirely covering the sterna and connexivum, and the body broad 2.0× as long as broad are diagnostic for this species.

Material examined. BRAZIL, Amazonas, Careiro da Várzea municipality, Purupuru lake , BR 319, 08.VIII.2012, N. Hamada col., F. Stefanello, 2018 det., 1♀ ( INPA) . Barcelos municipality, Demini river , 00°38’05.3”S 62°51’52.7”W, 24.IX.2014, A.M.O. Pes et al. colls., F. Stefanello, 2018 det., 2³ and 2♀ ( INPA) . Santa Isabel do Rio Negro municipality, Maruiá river , 19.IX.2014, A.M.O. Pes et al. colls., F. Stefanello, 2018 det., 2♀ ( INPA) . Roraima, Caracaraí municipality, Pretinho stream, near Jufari river , 00°57’45.6”S 62°06’40.2”W, 29.IX.2014, A.M.O. Pes et al. colls., F. Stefanello, 2018 det., 3³ and 4♀ ( INPA) . COLOMBIA, Vaupés, Mitú municipality, F. Stefanello, 2019 det., 1³ ( ICN) . VENEZUELA, Amazonas, stream along Sipapo river , 04°55’50.9”N 67°44’38.6”W, 16.I.2009, A.E.Z. Short et al. colls., F. Stefanello, 2019 det., 3³ ( SEMC) . Apure, morichal between Orinoco and Cinaruco rivers, 06°30’53.9”N 7°32’36.2”W, 17.I.2009, A.E.Z. Short et al. colls., F. Stefanello, 2019 det., 1³ ( SEMC) . The holotype of B. fittkaui housed in the MACN has been examined by photos of the habitus, head and abdominal pilosity.

Distribution. Previous records include Amazonas and Roraima states in Brazil ( De Carlo 1966, Almeida et al. 2019). New records include Vaupés Department in Colombia, as well as Amazonas and Apure states in Venezuela ( Fig. 3 ).

Figures

FIGURE 1. Diagnostic characters of the Belostoma fittkaui group:A—lateral view of the head showing the condition of articles II and III of the labium and prosternal keel; B—ventral view of abdomen showing the pilosity of segments II–VII; C—dorsal view of head and pronotum of Belostoma fittkaui; D—dorsal view of head and pronotum of B. sayagoi. ant = anteoculus, con = connexivum, int = interoculus, lab = labium, prk = prosternal keel, pro = pronotum, ste = sternites. The scale bar applies only to C and D.

FIGURE 2. Habitus of holotypes and labels: A –Belostoma fittkaui and its labels; B –B. sayagoi and its labels.

FIGURE 3. Distribution of Belostoma fittkaui group in tropical South America: red circles = B. fittkaui; blue squares = B. sayagoi, yellow square = B. hirsutum syn. n.