Syzeton belovi, Gompel, 2022

Gompel, Nicolas, 2022, The genus Syzeton Blackburn, 1891 (Coleoptera, Aderidae) in the United States of America, Zootaxa 5162 (3), pp. 243-267 : 258-259

Syzeton belovi n. sp.

( Figures 2h ; 3h ; 4b ; 5h, m, p )

Etymology. This taxon is named after my colleague Vassili Belov, who provided most of the type series, in appreciation of his systematic efforts to collect Aderidae .

Type locality. United States: Texas. Brazos County, 5 km SW Wellborn, (80 m) [30°30’08” N 96°20’10” W] .

Distribution. United States: Oklahoma, Texas, Florida.

Description. Body length. ♂: 1.78± 0.11 mm (n=3) ♀: 1.83± 0.09 mm (n=5). Body and appendages entirely orange, head somewhat darker.

Head ( Figure 4b ). Transverse, dark-orange, slightly wider than pronotum. Frons convex. Palpi orange. Punctures sparse (spaces between punctures much wider than the puncture diameters), fine and deep. Pubescence uniseriate, long, very dense, white-golden, reclinate and converging toward the midline between the eyes.

Eyes convex, bulging, separated from the posterior edge of the head in side view by a distance the width of three rows of ommatidia. Eyes emarginate, with a deep anterior notch where the antennae are inserted, separated from each other by nearly two eye diameters in front view ( Figure 4b , double arrow).

Antennae. Thick, covered with thin and stout setae, 80% the length of elytra in ♂♂, 60% in ♀♀, orange. Antennomeres 3–10 weakly conical, subquadrate in ♂♂, transverse in ♀♀, regularly thicker toward apex. Last antennomere twice as long as penultimate, rounded.

Pronotum. Transverse, regularly convex, pentagonal, with a straight base flanked by broadly rounded posterior angles, weakly diverging straight sides, and apex composed of two segments converging toward the head insertion in an obtuse rounded angle. Surface densely and coarsely punctate, the space between punctures equal to, or smaller than the puncture diameters, punctures large, deep. Pubescence uniseriate, long, raised, dense, golden.

Elytra. Length. ♂: 1.21± 0.06 mm (n=3) ♀: 1.32± 0.07 mm (n=5). Elongate (width/length ♂: 0.55±0.01 (n=3) ♀: 0.52±0.03 (n=5), sides subparallel, humeral angles well marked. Punctures dense, strong and deep, coarser than on the pronotum, space between punctures smaller than the puncture diameters. Disc weakly but regularly convex. Pubescence uniseriate, long, dense, silky, raised, golden ( Figure 5p ).

Legs. Simple, inconspicuous, orange. Foretibia straight and simple in both sexes.

Aedeagus ( Figure 3h ). Elongate, straight, regularly thinner from base to apex. Apex abruptly truncated in ventral view. Somewhat bent along its dorsal side in lateral view, with a slight sinuosity before the base, and no distinct process protruding ventrally (contrary to S. arizonae n. sp., Figure 3g ).

Sexual dimorphism. Eyes more separated in ♀♀ than in ♂♂. Antennae shorter with antennomeres 3–10 transverse in females (note the difference with S. pallidus ( Werner, 1990) , Figure 5m, n and insets).

Type material. United States. Florida: Alachua County, Gainesville , 3517 NW 10th Avenue , (30 m) [29°39’ N 82°22’ W], at light, 6.V.2007, R. E. Woodruff leg. (1 ♀ paratype, FSCA) ; Alachua County, Orange Heights , (50 m) [29°43’ N 82°08’ W], sticky wire trap,. XII.1983, M. J. Plagens leg. (1 ♂ paratype, FSCA) ; Liberty County, Torreya State Park , (40 m) [30°33’ N 84°56’ W], 6.V.2007, M. C. Thomas leg. (1 ♂ paratype, NGPC) ; Palm Beach County, Palm Beach, Loxahatchee , (10 m) [26°46’ N 80°14’W], suction trap, 4.IV.2006, S. Halbert leg. (1 ♀ paratype, FSCA) . Oklahoma: Latimer County, 4 mi. W Red Oak , (180 m) [34°56’ N 95°09’ W], 4.VII.1987, D.S. Chandler leg. (1 ♀ paratype, UNHC) . Texas: Brazos County, 5 km SW Wellborn , (80 m) [30°30’ N 96°20’ W], at lights, 19.X.2016, V. Belov leg. (1 ♀ paratype, NGPC) ; Brazos County, 5 km SW Wellborn , (80 m) [30°30’ N 96°20’ W], at lights, 24.X.2016, V. Belov leg. (2 ♀♀ paratypes, VBPC) ; Brazos County, 5 km SW Wellborn , (80 m) [30°30’ N 96°20’ W], at lights, 18.III.2017, V. Belov leg. (2 ♀♀ paratypes, VBPC; 1 ♂, NGPC) ; Brazos County, 5 km SW Wellborn , (80 m) [30°30’ N 96°20’ W], at lights, 19.IV.2017, V. Belov leg. (1 ♀ paratype, NGPC) ; Brazos County, 5 km SW Wellborn , (80 m) [30°30’ N 96°20’ W], at lights, 22.V.2017, V. Belov leg. (1 ♀ paratype, VBPC) ; Brazos County, 5 km SW Wellborn , (80 m) [30°30’ N 96°20’ W], at lights, 26.V.2017, V. Belov leg. (1 ♀ paratype, VBPC) ; Brazos County, 5 km SW Wellborn , (80 m) [30°30’ N 96°20’ W], at lights, 31.V.2017, V. Belov leg. (1 ♀ paratype, VBPC) ; Brazos County, 5 km SW Wellborn , (80 m) [30°30’ N 96°20’ W], at lights, 11.VI.2017, V. Belov leg. (1 ♀ paratype, VBPC) ; Brazos County, 5 km SW Wellborn , (80 m) [30°30’ N 96°20’ W], at lights, 20.VI.2017, V. Belov leg. (1 ♂, paratype, VBPC) ; Brazos County, 5 km SW Wellborn , (80 m) [30°30’ N 96°20’ W], at lights, 26.VI.2017, V. Belov leg. (1 ♀ paratype, VBPC) ; Brazos County, 5 km SW Wellborn , (80 m) [30°30’ N 96°20’ W], found dead,. V.2019, V. Belov leg. (1 ♂, paratype, VBPC) ; Brazos County, 5 km SW Wellborn , (80 m) [30°30’ N 96°20’ W], at lights, 6.VI.2019, V. Belov leg. (1 ♀ paratype, VBPC) ; Tyler County, Kirby State Forest , (40 m) [30°34’ N 94°25’ W], Ground-level flight intercept trap, 27.IV.2003, E. G. Riley leg. (1 ♀ paratype, ERPC) ; Walker County, Ellis Prison Unit , (60 m) [30°52’ N 95°27’ W], Suction trap, 24.V.1980, D. A. Dean leg. (1 ♂ paratype, TAMU) .

Figures

FIGURE 2. Habitus of US Syzeton species. a, Syzeton ouachitanus (Werner, 1990) ♂ from Texas. b, S. fasciatus (Melsheimer 1846) ♂ from Wisconsin. c, S. hubbardi (Casey 1895) ♂ from Oklahoma. d, S. nubifer (LeConte, 1878) ♂ from Texas. e, S. ater (LeConte, 1875) ♂ from Arkansas. f, S. gruberi n. sp. ♂ paratype from Arizona. g, S. arizonae n. sp. ♂ holotype from Arizona. h, S. belovi n. sp. ♂ holotype from Texas. i, S. pallidus (Werner, 1990) ♂ from Texas. j, S. subfasciatus (LeConte, 1855) ♂ from Missouri. k, S. floridanus (Werner, 1990) ♂ from Florida. l, S. signatus (Haldeman, 1848) ♂ from South Carolina. m, S. ouachitanus (Werner, 1990), elytral variation. n, S. hubbardi (Casey 1895), elytral variations, the white lines delinate a ~20º angle between the inner oblique markings. o, S. nubifer (LeConte, 1878), elytral variations, the white lines delinate a ~30–40º angle between the inner oblique markings. Scale bars: 1 mm.

FIGURE 3. ♂ genitalia of US Syzeton species in ventral view (left on all panels) and lateral view (right on all panels, ventral facing to the left). a, Syzeton ouachitanus (Werner, 1990) ♂ from Texas. b, S. fasciatus (Melsheimer 1846) ♂ from Wisconsin. c, S. hubbardi (Casey 1895) ♂ from Oklahoma. d, S. nubifer (LeConte, 1878) ♂ from Texas. e, S. ater (LeConte, 1875) ♂ from Texas. f, S. gruberi n. sp. ♂ paratype from Arizona. g, S. arizonae n. sp. ♂ holotype from Arizona. h, S. belovi n. sp. ♂ holotype from Texas. i, S. pallidus (Werner, 1990) ♂ from Texas. j, S. subfasciatus (LeConte, 1855) ♂ from Missouri. k, S. floridanus (Werner, 1990) ♂ from Florida. l, S. signatus (Haldeman, 1848) ♂ from South Carolina. Note the presence of air bubbles in some of the genitalia presented here. Scale bars: 0.1 mm.

FIGURE 4. Heads of US Syzeton species. a–c and e–g, ♂ heads in frontal view. a, Syzeton arizonae n. sp. ♂ holotype from Arizona. b, S. belovi n. sp. ♂ holotype from Texas. c, S. floridanus (Werner, 1990) ♂ from Florida. d, Syzeton pallidus (Werner, 1990) ♂ from Texas. e, S. signatus (Haldeman, 1848) ♂ from South Carolina. f, S. subfasciatus (LeConte, 1855) ♂ from Mis- souri. Note the difference in interocular space denoted by white double arrows for each species. d and h, ♀ heads in side view. d, S. ater (LeConte, 1875) ♀ from Texas. h, S. ouachitanus (Werner, 1990) ♀ from Mississippi (paratype of Zonantes mississippiensis Werner, 1990). Note the difference in eye size, best seen when comparing the distance from the antennal notch to the edge of the eye, or the space separating the eye from the posterior head margin (white double arrows). Scale bars: 0.1 mm.

FIGURE 5. External morphology of US Syzeton species. a–l, ♂ right foretibia in upper view. a, Syzeton ouachitanus (Werner, 1990) ♂ from Texas. b, S. fasciatus (Melsheimer 1846) ♂ from Wisconsin. c, S. hubbardi (Casey 1895) ♂ from Oklahoma. d, S. nubifer (LeConte, 1878) ♂ from Texas. e, S. ater (LeConte, 1875) ♂ from Texas. f, S. gruberi n. sp. ♂ paratype from Arizona. g, S. arizonae n. sp. ♂ holotype from Arizona. h, S. belovi n. sp. ♂ holotype from Texas. i, S. pallidus (Werner, 1990) ♂ from Texas. j, S. subfasciatus (LeConte, 1855) ♂ from Missouri. k, S. floridanus (Werner, 1990) ♂ from Florida. l, S. signatus (Haldeman, 1848) ♂ from South Carolina.Arrowheads indicate kinks or other modification of the inner side of the tibias; double black arrow denotes the curve of the tibia. m–n, ♀ antennae with details of antennomere 6–8 (inset). m, S. belovi n. sp. ♀ paratype from Texas. n, S. pallidus (Werner, 1990) ♀ from Texas. o, left hind-leg of S. fasciastus (from Wisconsin) in ventral view (arrow indicates the inflated femur). p–q, pubescence on elytral disc. p, S. belovi n. sp. ♂ holotype from Texas. q, S. arizonae n. sp. ♂ holotype from Arizona. Scale bars: 0.1 mm.