Zikanita diversicornis, Nascimento & Santos-Silva & Barclay, 2019

Nascimento, Francisco E. de L., Santos-Silva, Antonio & Barclay, Maxwell V. L., 2019, On the tribal allocation of Cosmotomidius Melzerı 1931 ı descriptions of new taxa of Acanthoderini and notes on some tribes of Lamiinae (Coleoptera: Cerambycidae), Journal of Natural History 53 (11), pp. 705-723 : 717-721

Zikanita diversicornis sp. nov.

( Figure 4 (a – f))

Description

Female. Integument mostly dark brown; mouthparts dark reddish brown, with lighter areas, especially on palpi; antennomeres slightly dark reddish brown towards XI; elytra gradually, slightly dark reddish brown towards apex; legs dark reddish brown, except yellowish-brown central area of tibiae.

Head. Frons minutely, densely punctate throughout; with yellowish-white pubescence partially obscuring integument, gradually yellowish brown towards vertex, with very long, white setae interspersed. Area between antennal tubercles with sculpturing and erect setae as on frons; with yellowish-brown pubescence nearly obscuring integument; area between antennal tubercles and upper eye lobes with slightly elevated, longitudinal carina centrally; remaining surface of vertex densely, finely punctate (finer than on frons); with yellowish-brown pubescence obscuring integument interspersed with very long, erect white setae between upper eye lobes. Area behind eyes minutely, densely punctate (punctures finer than on frons); with dense yellowish-brown pubescent band close to eye, nearly glabrous on remaining surface; with a few long, erect yellowish-brown setae close to upper eye lobe; with very long, erect white setae close to lower eye lobe. Antennal tubercles with sculpturing as on frons; with yellowish-brown pubescence partially obscuring integument on inner surface, yellowishwhite on anterior and posterior surfaces, and close distal margin. Median groove slightly marked close to clypeus and prothoracic margin, well marked on remaining area. Genae with dense yellowish-brown pubescence except glabrous area close to apex. Gulamentum smooth and glabrous except narrow anterior area slightly rugose, with sparse yellowish-brown pubescence. Postclypeus narrow, nearly horizontal close to frons, abruptly inclined towards anteclypeus; with yellowish-brown pubescence partially obscuring integument on wide central area, glabrous laterally; with very long, erect, sparse yellowish-brown setae (more brownish depending on light intensity). Labrum coplanar with anteclypeus at posterior half, inclined at anterior half; with moderately sparse yellowish-brown pubescence on posterior half, interspersed with long, brownish setae laterally, glabrous on anterior half; with short fringe with yellowish pubescence on anterior margin. Distance between upper eye lobes 0.49 times length of scape; in frontal view, distance between lower eye lobes 0.93 times length of scape. Antennae 1.46 times elytral length, reaching elytral apex at apex of antennomere X. Scape with yellowish-brown pubescence partially obscuring integument (lighter depending on light intensity), with central area with yellowish-white pubescence dorsally; with very long, sparse, erect white setae. Antennomeres with yellowish-brown pubescence partially obscuring integument, except basal white pubescent ring; ventral side of antennomeres III – VII with long, erect white and brownish setae (gradually sparser towards VII). Antennal formula (ratio) based on length of antennomere III: scape = 0.85; pedicel = 0.14; IV = 1.00; V = 0.78; VI = 0.68; VII = 0.61; VIII = 0.56; IX = 0.51; X = 0.46; XI = 0.44.

Thorax. Prothorax 1.73 times wider than long (including lateral tubercles); lateral tubercles large, conical, with apex obliquely truncate. Pronotum with three large tubercles, one conical, moderately elevated, placed on each side of middle, another central, elliptical, less elevated, placed centrally at posterior half; coarsely, deeply, sparsely punctate near anterior and posterior margins (part of punctures aligned), centrally before central tubercle (punctures near each other), and laterally (punctures distinctly sparser); with yellowish-brown pubescence centrally, obscuring integument, dense yellowish pubescence laterally, and black pubescence on sub-reniform areas; with a few long, erect white setae. Sides of prothorax coarsely, deeply punctate near anterior and posterior margins (punctures coarser than on pronotum); with yellowish-brown pubescence obscuring integument. Ventral side of thorax with yellowish-white pubescence partially obscuring integument (more whitish depending on light intensity); with sparse, moderately long, erect white setae on metathorax. Mesoventral process with central tubercle moderately elevated close to anterior margin, inclined, disappearing towards posterior area. Scutellum with dense yellowish-brown pubescence except yellowishwhite pubescence laterally.

Elytra. Carina of basal fifth elevated, not flattened at top, posterior area not abruptly inclined and not with superior area projected backwards, with long, erect, dark setae on top. Surface coarsely, sparsely punctate (punctures sparser towards apex); apex slightly oblique truncate, with outer spine long, and sutural angle slightly projected. Pubescence as follows: with yellowish-brown pubescence on wide V-shaped anterior quarter, obscuring integument (including top of carina); white on wide, transverse band slightly surpassing middle, not reaching inclined sides; transverse V-shaped area (narrow area close to suture, widened towards inclined area), placed on before posterior quarter, with light yellowish-brown pubescence interspersed with areas with dark-brown and darker yellowish-brown pubescence; dense white pubescence on posterior quarter, interspersed with small, circular areas with brownish pubescence; with very long, erect white setae, especially laterally, and long, erect dark setae centrally.

Legs. Femora with yellowish-white pubescence not obscuring integument, except large macula with yellowish-brown pubescence on about middle of club; with very long, erect, sparse white setae. Tibiae with yellowish-white pubescence nearly obscuring integument (more whitish depending on light intensity), except one ring with sparse yellowish-brown pubescence on basal and distal half; with very long, erect, sparse white setae. Tarsi with sparse yellowish-white pubescence, denser on basal half of tarsomere I.

Abdomen. Ventrites I – IV with yellowish-white pubescence partially obscuring integument laterally, sparser centrally, longer, more yellowish on posterior area (except centrally on II – IV); ventrite V longitudinally depressed centrally, with sparse yellowish-brown pubescence on basal 3/4, slightly denser, longer on distal quarter, with long, erect setae of same colour interspersed on posterior quarter.

Dimensions (holotype female)

Total length, 12.80; prothoracic length, 2.50; posterior prothoracic width, 3.20; anterior prothoracic width, 3.20; maximum prothoracic width (between apices of lateral tubercles), 4.40; humeral width, 5.15; elytral length, 9.05.

Type material

Holotype female (paratype of Z. perpulchra ) from BRAZIL, São Paulo: São Paulo (Santo Amaro), 1 November 1940, no collector indicated ( MZSP).

Etymology

Latin: ‘diversis’ (different), and ‘cornis’ (horn), referring to the difference in antenna length from its congeners.

Remarks

As discussed above, Lane (1943) considered the paratype of Z. perpulchra (now the holotype of Z. diversicornis ) from Santo Amaro as being a specimen of atypical development. Actually, Z. diversicornis differs considerably from females of Z. perpulchra , not only in the features pointed out by Lane (1943) but also in other characters, making it evident that it is a different species: antennomeres III and IV ( Figure 4 (a)) of the same length; lateral tubercles of the pronotum ( Figure 4 (c – e)) considerable smaller and less elevated; anterior carina of the elytra ( Figure 4 (a – d)) is uniformly inclined towards its posterior area, not flattened dorsally, not projected backwards posteriorly, pubescent and with long, erect, dark setae dorsally; mesoventral process ( Figure 4 (f)) distinctly less elevated and gradually inclined towards its apex. In the female of Z. perpulchra , antennomere III is longer than IV ( Figure 3 (a)) the lateral tubercles of the pronotum ( Figure 3 (f,g)) are distinctly larger and more elevated, the anterior carina of the elytra ( Figure 3 (a,g)) is abruptly inclined posteriorly, flattened dorsally, projected backwards posteriorly, glabrous and without erect setae dorsally, and the mesoventral process ( Figure 3 (b)) is notably elevated and abruptly inclined posteriorly.

Figures

Figure 3. Zikanita perpulchra: (a) dorsal habitus, female; (b) mesoventral process, lateral view, female; (c) ventral habitus, female; (d) dorsal habitus, male; (e) ventral habitus, male; (f) head, frontal view, female; (g) elytra, lateral view, female.

Figure 4. Zikanita diversicornis, holotype female: (a) dorsal habitus; (b) ventral habitus; (c) lateral habitus; (d) elytra, lateral view; (e) head, frontal view; (f) mesoventral process, lateral view.