Rhinusa kumatschevi ( Bajtenov, 1977 )

Caldara, Roberto & Toševski, Ivo, 2019, Rhinusa Stephens: a taxonomic revision of the species belonging to the R. linariae R. herbarum, R. melas, and R. mauritii groups (Coleoptera Curculionidae), Zootaxa 4679 (2), pp. 318-340 : 323-324

Rhinusa kumatschevi ( Bajtenov, 1977)

Fig. 3

Gymnetron kumatschevi Bajtenov, 1977: 184 .

Type locality. Sary-Taukum Desert ( Kazakhstan) .

Type series. This species was described from 10 specimens collected in Kazakhstan (Sary-Taukum pustynya, 15.VII.1977) by I. Kumatschev. We examined the holotype (male, previously in the collection Fremuth, currently in MMCT) and four paratypes (2 DEIM, 2 MZHF). It is noteworthy that the description of this species remained previously unknown to the authors and therefore this name was not reported in the recent catalogue of the Palaearctic weevils ( Alonso-Zarazaga et al. 2017). It is also noteworthy that the date of collection of the type specimens (1977) is subsequent to that of the paper (1976). A possible explanation is that at least the fascicle of the volume of the journal where Bajtenov’s paper appeared was predated and probably published not sooner than the end of 1977. Therefore, also supported by the kind opinion of M.A. Alonso-Zarazaga, we decided to establish 1977 as the date of Bajtenov’s paper.

Redescription. Male. Body: oval, stout. Integument completely reddish ( Fig. 3 ). Rostrum: short (Rl/Pl 0.70); in lateral view strongly curved, very stout in basal third, further slightly narrowed toward apex (as in R. linariae , Fig. 10 ); in dorsal view with subparallel sides, with moderately visible scrobes, striate-punctate in basal two thirds, smoother and shining along midline and at apical third, in basal third with sparse recumbent short (l/w 3–4) whitish scales. Head: between eyes as wide as rostrum at base, without fovea. Eyes almost flat. Antennae: inserted at mid- dle of rostrum; scape 2.5× longer than wide, funicle distinctly longer than scape, with segment 1 twice longer than wide, slightly stouter than and about as long as segment 2, which is 2.5× longer than wide, segments 3–5 gradually more transverse; club oval, with segment 1 pubescent similarly to others. Pronotum: with dense and regular punctures, intervals between punctures narrow, smooth and shining, well visible between sparse recumbent moderately long (l/w 5–7) subelliptical whitish scales; transverse (Pw/Pl 1.38), distinctly constricted at apex, with distinctly rounded sides, widest between basal and middle thirds, almost flat. Elytra: 1.22× as long as wide, subelliptical, 1.29× as wide as pronotum, with basal margin transverse until interstria 5, further moderately beveled anteriorly, with moderately rounded sides, widest at middle, weakly convex on disc; interstriae well visible between sparse recumbent elliptical to sublanceolate whitish scales, 0.75× as long as width of interstria (l/w 6–8) and arranged in 2–3 irregular rows; striae well visible, half as wide as interstriae, with a row of scales slightly narrower than those on interstriae. Legs: stout, reddish, with sparse recumbent to suberect whitish scales distinctly shorter than width of tibia; femora subclavate, without tooth; tibiae stout, distinctly sinuous at middle, with outer margin moderately carinate; unci thin, all of same size; tarsi with tarsomere 1 1.8× longer than wide, tarsomere 2 1.2× longer than wide, tarsomere 3 bilobed and distinctly wider than tarsomere 2, onychium as long as tarsomeres 1–3 taken together; claws equal in length. Venter: metasternum dark reddish, with sparse subrecumbent long setiform whitish scales. Mesepimera, mes- and metepisterna with sparse long setiform whitish scales. Abdomen reddish brown, with dense and regular punctures, well visible between sparse recumbent to subrecumbent setiform whitish scales; length ventrites 1+2/3+4 1.98. Penis: as in R. linariae ( Fig. 27 ).

Female. Rostrum slightly longer (Rl/Pl 0.78) (as in R. linariae , Fig. 11 ), in dorsal view smooth and shining from antennal insertion to apex, antennae inserted between basal and middle thirds of rostrum. Spiculum ventrale and spermatheca as in R. linariae ( Figs 33 and 39 ).

Variability. Length 2.4–2.8 mm. No relevant differences have been found between the five specimens of the type series examined.

Remarks and comparative notes. This species differs from R. linariae and R. brisouti by the integument completely reddish, the protibiae almost straight, and the tarsomere 3 only moderately larger than tarsomere 2. It differs from R. brisouti also by the narrow pronotum and the more elongate elytra.

Biological notes. No data are available.

Distribution. Kazakhstan.

Non-type material examined. No specimens.

Rhinusa herbarum group

Remarks and comparative notes. According to Caldara et al. (2010), the monophyly of this group is supported by two characters in the shape of the median lobe which is short and in lateral view with sides distinctly widening in apical part. Moreover, the group can be distinguished by the elytra rectangular and only slightly wider than pronotum and the femora unarmed. Finally, the host plants pertain to the genus Kickxia . Due to the overall look and the shape of the penis this group might be related to the R. melas group.

Figures

FIGURES 1‒9. Habitus of (1) Rhinusa linariae, male; (2) R. brisouti, male; (3) R. kumatschevi, male; (4) R. herbarum, male; (5) R. vulpeculus, holotype male; (6) R. mateui, female; (7) R. melas, male; (8) R. korotyaevi, paratype male; (9) R. mauritii, male. Not to the same scale

FIGURES 10‒22. Rostrum of (10) Rhinusa linariae, male; (11) R. linariae, female; (12) R. herbarum, male; (13) R. herbarum, female; (14) R. mateui, male; (15) R. mateui, female; (16) R. melas, male; (17) R. melas, female; (18) R. korotyaevi, male; (19) R. korotyaevi, female; (20) R. mauritii, male; (21) R. mauritii, female; (22) R. antirrhini, male.

FIGURES 23‒32. Profemur and protibia of (23) Rhinusa bipustulata, male; (24) R. linariae, male; (25) R. tetra, male; (26) R. tetra, female. Penis in dorsal view of (27) R. linariae; (28) R. herbarum; (29) R. mateui; (30) R. melas; (31) R. korotyaevi; (32) R. mauritii.

FIGURES 33‒44. Spiculum ventrale of (33) Rhinusa linariae; (34) R. herbarum; (35) R. mateui; (36) R. melas; (37) R. korotyaevi; (38) R. mauritii. Spermatheca of (39) R. linariae; (40) R. herbarum; (41) R. mateui; (42) R. melas; (43) R. korotyaevi; (44) R. mauritii.