Syzeton arizonae, 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

publication ID	https://doi.org/10.11646/zootaxa.5162.3.3
publication LSID	lsid:zoobank.org:pub:38EE4183-B7A3-44AC-9441-A4EE7E32159E
DOI	https://doi.org/10.5281/zenodo.6810158
persistent identifier	https://treatment.plazi.org/id/03E187D7-3153-FFC6-DBD6-FF2AFAFAFADC
treatment provided by	Plazi (2022-07-08 08:33:12, last updated 2024-11-26 23:43:00)
scientific name	Syzeton arizonae
status	sp. nov.

Treatment

Syzeton arizonae n. sp.

( Figures 2g View FIGURE 2 ; 3g View FIGURE 3 ; 4a View FIGURE 4 ; 5g, q View FIGURE 5 )

Etymology. This taxon is named after its geographic origin.

Type locality. United States: Arizona. Cochise County, Coronado National Forest, Chiricahua Mountains , 1 mi. N Rustler Park [31°54’53” N 109°16’07” W] GoogleMaps .

Distribution. United States: Arizona.

Description. Body length. ♂ holotype: 1.50 mm. Body and appendages entirely orange-yellow.

Head ( Figure 4a View FIGURE 4 ). Transverse, orange-yellow, slightly wider than pronotum. Frons relatively depressed (compared to S. belovi n. sp.). Palpi orange-yellow. Punctures sparse (spaces between punctures much wider than the puncture diameters), fine and shallow. Pubescence uniseriate, short, appressed, yellow, reclinate.

Eyes small, convex, bulging, separated from the posterior edge of the head in side view by a distance half the eye diameter. Eyes nearly round, their outline hardly modified near the antennal insertions, separated from each other by three eye diameters in front view ( Figure 4a View FIGURE 4 , double arrow).

Antennae. Filiform, thinner than in S. belovi n. sp., covered with thin and stout setae, 75% the length of elytra in the ♂ holotype, orange-yellow. Antennomeres 3–10 weakly conical, subquadrate, regularly thicker toward apex. Last antennomere twice as long as penultimate, rounded.

Pronotum. Transverse, oval-shaped, posterior and anterior angles hard to discern, sides convex and rounded. Surface densely and coarsely punctate, the space between punctures much smaller than the puncture diameters, punctures large, deep. Pubescence uniseriate, short, appressed, yellow.

Elytra. Length. ♂ holotype: 1.05 mm. Elongate (width/length ♂ holotype: 0.52), sides rounded, humeral angles well marked. Punctures dense, strong and deep, coarser than on the pronotum, space between punctures much smaller than the puncture diameters. Disc weakly but regularly convex. Pubescence uniseriate, short, appressed, yellow ( Figure 5q View FIGURE 5 ).

Legs. Simple, inconspicuous, yellow. Foretibia of the ♂ holotype straight with an apical inward kink and an inner tooth. These are male-specific characters.

Aedeagus ( Figure 3g View FIGURE 3 ). Elongate, straight, regularly thinner from base to apex. Apex briefly tapered, with a ventral sinuosity in lateral view. Dorsal side with two sinuosities in lateral view, and an elongated process protruding ventrally (contrary to S. belovi n. sp., Figure 3h View FIGURE 3 ).

Type material. United States. Arizona: Cochise County, Coronado National Forest, Chiricahua Mountains , 1 mile N Rustler Park, 21.VIII.2000, B. Rodriguez Velez leg. (1 ♂ holotype, TAMU) ; Cochise County, Sunnyside , (1780 m) [31°26’ N 110°24’ W], 20.VIII.1972, K. Stephan leg. (1 ♀ paratype, FSCA) GoogleMaps ; Cochise County, Sunnyside , (1780 m) [31°26’ N 110°24’ W], 19.IX.1972, (1 ♀ paratype, FSCA; 1 ♂ paratype, NGPC) K. Stephan leg. GoogleMaps

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.