Syzeton ater (LeConte, 1875) Gompel, 2022

Gompel, Nicolas, 2022, The genus Syzeton Blackburn, 1891 (Coleoptera, Aderidae) in the United States of America, Zootaxa 5162 (3), pp. 243-267 : 255-256

Syzeton ater (LeConte, 1875) , comb. nov.

( Figures 2e ; 3e ; 4d ; 5e )

Xylophilus ater LeConte, 1875: 175 ;

Holotype: Texas, Belfrage ( MCZC) ( Werner, 1990)

Zonantes ater (LeConte, 1875) : Werner (1990)

Material examined. United States. Arkansas: Polk County , Mena, (350 m) [34°35’ N 94°14’ W], UV light traps, 19.VII.2007, B. Baldwin leg. (1 ♂, UNHC) ; UV light traps, 6.IX.2010, B. Baldwin leg. (1 ♀, UNHC) . Missouri: Jackson County, Blue Springs [39°01’ N 94°16’ W], on Celtis occidentalis L., 5.VII.1999, G. H. Nelson leg. (1 ♀, FSCA) ; Jackson County, Raytown [39°00’ N 94°27’ W], 21.VI.1978, G. H. Nelson leg. (1 ♂, NGPC) . Ohio: Cuyahoga County, Fairview Park, MacBeth Avenue , (220 m) [41°25’ N 81°52’ W], UV light, 22.VIII.2007, H. J. Lee leg. (1 ♀, UNHC) ; Franklin County, Columbus [39°57’ N 82°59’ W] 28.VI.1991, B. & B. Valentine leg. (1 ♀, FSCA) ; Franklin County, Columbus [39°57’ N 82°59’ W] 5.VII.1991, B. & B. Valentine leg. (1 ♀, FSCA) ; Franklin County, Columbus [39°57’ N 82°59’ W] 8.VII.1991, B. & B. Valentine leg. (1 ♀, NGPC) ; Franklin County, Columbus [39°57’ N 82°59’ W] 29.VIII.2000, B. & B. Valentine leg. (1 ♀, FSCA) . Texas: Comal County, Bulverde [29°47’ N 98°25’ W], mercury vapors + black light, 11.VI.1998, R. Turnbow leg. (1 ♂, FSCA) . Oklahoma: Grady County, Tuttle, Silver Ridge Drive , (390 m) [35°19’ N 97°44’ W] Blacklight trap, 20.V.2005, B. Baldwin leg. (1 ♂, UNHC) ; UV light traps, 19.V.2006, B. Baldwin leg. (3 ♂♂, UNHC) . Texas: Brazos County, 5 km SW Wellborn , (80 m) [30°30’ N 96°20’ W], At lights, 31.X.2016, V. Belov leg. (1 ♂, VBPC) ; At lights, 4.IX.2020, V. Belov leg. (1 ♂, VBPC) ; Wise County, Black Creek Reservoir, (300 m) [33°20’ N 97°35’ W], Dry oak savannah, UV sheet, Woodland with scattered red cedar, 15.IX.2009, J. P. Gruber leg. (1 ♂, WIRC) ; Dry oak savannah-woodland, Attracted by UV light, 15.IX.2009, J. P. Gruber leg. (1 ♀, NGPC) .

Distribution. United States: Louisiana and Texas to Ohio and Illinois ( Werner, 1990).

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.