Acanthoventris drewseni ( Stål, 1854 )

Sanborn, Allen F., 2024, The cicadas (Hemiptera: Cicadidae) of Uruguay with a key to known species and comments on species of the genus Acanthoventris Ruschel including the resurrection of a previously synonymized species, Zootaxa 5399 (4), pp. 301-326 : 312-314

Acanthoventris drewseni ( Stål, 1854) ( Figs. 1–2 )

Cicada drewseni Stål 1854: 242 (Minas Gerias, Brazil).

Remarks. As outlined above, Acanthoventris gastracanthophora ( Berg, 1879) , revised status, n. comb. is removed from junior synonymy of Acanthoventris drewseni based on morphological and coloration differences. Measurement data are provided here for the statistical comparison with Argentine specimens to support the separation of Acanthoventris gastracanthophora ( Berg, 1879) , revised status, n. comb. as a distinct species.

A single female specimen of Acanoventris drewseni was available for study as all other specimens available to the author previously identified as Acanoventris drewseni were reassigned to one of the new species identified by Ruschel et al. (2023) or were determined to be Acanthoventris gastracanthophora ( Berg, 1879) revised status, n. comb. Male measurements are taken from Ruschel et al. (2023) for the statistical analyses along with measurements from the available female and an additional record of female body length being taken from the syntype female illustrated in Fig. 1 . Syntype specimens are deposited in the Naturhistoriska Riksmuseet, Stockholm ( Fig. 1 ).

Description of female. The female example of Acanothoventris drewseni provides the opportunity to complete the redescription of the species. Ruschel et al. (2023) had only male specimens for their redescription. The description provided here will be made to emphasize the differences found in the female example from the redescription of the males in Ruschel et al. (2023) rather than describing the species completely again.

Ground color of female dark castaneous marked with piceous and tawny as displayed in the male. Head coloration as found in male with the addition of piceous posterior cranial depressions, a transverse piceous fascia margined with castaneous between the ventromedial eye and postclypeus (illustrated but not described in Ruschel et al. (2023)), the castaneous spot on the ventral postclypeus extends to the ventroposterior margin and recurves along the ventrolateral margin. Thoracic additions in the female include piceous pile on the lateral pronotal collar, silvery pile on mesonotum anterolateral margin, along lateral surface, between anterior arms and on lateral cruciform elevation and in wing groove. Wings and legs as in male except meracanthus reaches to middle of abdominal sternite II.

Female opercula. Female operculum roughly an isosceles triangle (with the base as the longest side) with rounded apex, proportionately larger than male reaching to auditory capsule, gutter present in all margins, ground color with thick piceous fascia along anterior margin continuing as thin fascia along anterolateral margin, covered with short white pile, very dense at base, opercula not meeting medially, reaching medially only to medial meracathus, extending posteriorly almost to anterior sternite II not covering tympanal cavity posteriorly or laterally with apex reaching auditory capsule.

Female abdomen. Female tergites colored and covered with pile similar to male pattern except tergites 3–7 primarily castaneous with tawny posterior margin. Female sternite VII about twice as long as sternite VI, transverse posterior margin with single open V-shaped notch, posterolateral margin curving to straight lateral margin angled anterolaterally from curve. Female abdominal segment 9 castaneous with elongated darker region on anterior dorsolateral surface, darker at base of dorsal beak, and darker at angle of posteroventral margin, posteroventral angle covered with dense golden pile, segment 9 covered with long golden pile, short piceous and short silvery pile laterally and dorsoposteriorly. Dorsal beak slightly sinusoidal to tip, slightly longer than ochraceous anal styles and almost as long as ovipositor sheath. Posterior margin of abdominal segment 9 smoothly curved forming an approximate right angle.

Female genitalia. Female gonocoxite IX castaneous. Gonapophysis IX castaneous, gonapophysis X piceous with castaneous medial margin. Ovipositor sheath extends slightly beyond end of dorsal beak. Long golden pile radiating from ovipositor sheath, ovipositor sheath and anal styles with short golden pile.

Measurements (mm). N= one female. Length of body: 17.70; length of fore wing: 27.20; width of fore wing: 7.90; length of head: 2.00; width of head including eyes: 8.00; length of pronotum: 2.85; width of pronotum including suprahumeral plates: 7.90; length of mesonotum: 4.95; width of mesonotum: 6.75.

Data for statistical analyses based on N = two males, one female, mean ± standard deviation (range, N). Male data from Ruschel et al. (2023). Body length of female syntype included in species and female body length calculations. The female syntype body length is 20.00 mm measured from the image in Fig. 1 . Length of body (males and female): 17.83 ± 1.63 (16.05–20.00, N=4); length of body (males): 16.80 ± 1.05 (16.05–17.54, N=2); length of body (females): 18.85 ± 1.63 (17.70–20.00, N=2); length of fore wing: 26.35 ± 1.67 (24.42–27.46, N=3); width of fore wing: 8.03 ± 0.51 (7.60–8.59, N=3); length of head: 1.53 ± 0.41 (1.25–2.00, N=3); width of head including eyes: 7.77 ± 0.46 (7.24–8.07, N=3); length of pronotum: 2.68 ± 0.14 (2.59–2.85, N=3); width of pronotum including suprahumeral plates: 7.70 ± 0.36 (7.29–7.92, N=3); length of mesonotum: 5.10 ± 0.51 (4.68–5.66, N=3); width of mesonotum: 6.63 ± 0.21 (6.39–6.75, N=3).

Distribution. The verified species distribution was restricted to the states of Minas Gerias and Goiás, Brazil ( Ruschel et al. 2023). The specimen available for study extends the range into the Distrito Federal, Brazil.

Material examined. “ BRAZIL / Distrito Federal / Brasilia / P.C. Motta coll.” one female ( AFSC). The syntype specimens were also photographed ( Fig. 1 ) in the Naturhistoriska Riksmuseet, Stockholm.

Figures

FIGURE 1. Cicada drewseni Stål, 1854 syntype specimens in the Naturhistoriska Riksmuseet, male (left) and female (right) dorsal habitus. Scale bar: 2 cm. ©Naturhistoriska Riksmuseet, Stockholm. Photo by the author.

FIGURE 2. Acanthoventris drewseni (Stål, 1854), Brasilia, Distrito Federal, Brazil: A, Female habitus; B, female ventral thorax; C, female operculum; D, lateral view of female genitalia; E, ventral view of female genitalia. Scale bar: A, 2 cm; B–E, 2 mm.