Doryscus wangi, Lee, Chi-Feng, 2017

Lee, Chi-Feng, 2017, Revision of the genus Doryscus Jacoby (Coleoptera: Chrysomelidae: Galerucinae), Zootaxa 4269 (1), pp. 1-43 : 41

Doryscus wangi sp. nov. ( Figs 20 D–20E, 23)

Doryscus testaceus: Mohamedsaid, 1999: 124 . Misidentification

Types (n= 5). Holotype ♂ ( TARI), Malaysia: Sabah, Trusmadi , 20.III.2015, leg. Y.- T. Wang . Paratypes: 3♀♀ (TARI), same as holotype; 1♀ (TARI), same but with “ 02.X.2014 ”; 1♀ ( BMNH), Danum Valley , 9.X.1997, leg. K. Liston, on Dryobalonops lanceolata.

Description. Length 4.1–5.1 mm, width 1.8–2.1 mm. General color brown ( Fig. 20 D). Antenna filiform, antennomere I not modified in males ( Fig. 23 A), length ratios of antennomeres I–XI 1.0: 0.4: 0.7: 0.8: 0.9: 0.9: 0.9: 0.9: 0.9: 0.9: 1.0, length to width ratios of antennomeres I–XI 3.5: 2.2: 3.5: 4.4: 4.5: 4.5: 4.7: 4.9: 4.9: 4.9: 1.6; narrower in females ( Fig. 23 B), length ratios of antennomeres I–XI 1.0: 0.3: 0.7: 0.8: 0.9: 0.9: 0.9: 0.9: 0.8: 0.8: 1.0; length to width ratios of antennomeres I–XI 3.8: 1.5: 3.2: 4.1: 4.1: 4.5: 4.8: 4.8: 4.6: 4.4: 5.0. Elytra 1.7 x longer than wide, disc with erect, brown, dense, elongate setae; and fine punctures. Apical margin of last abdominal ventrite with two well developed incisions in male ( Fig. 23 G; widely rounded in female ( Fig. 23 H). Penis ( Figs 23 C–23D) extremely slender, gradually narrowed towards apex; apex of dorsal surface with moderately deep; notch of apex of ventral surface shallow; weakly curved in lateral view, apex with groove between dorsal and ventral surface; ventral surface smooth. Internal sac with median endophallic spiculae elongate, about 0.8 x as long as penis, apices lobed, basally conjoined and narrowed, with one pair of lateral processes near apex, apically tapering; one apical endophallic spiculum between two median endophalic spiculae, apex truncate and basally tapering, curved downwards; with one curved process at basal 1/ 3 in lateral view; three pairs of dorsal spiculae at basal 1/3 of median endophallic spiculae, inner pair longest and straight, outer pair shortest and hornlike; one pair of ventral endophallic spiculae long, separated, apices bifurcate. Gonocoxae ( Fig. 23 E) extremely slender, 6.8 x longer than wide, sides slightly narrowed at apical 1/10; apices narrowed rounded; inner margins narrowly approximate from apex to apical 2/5, apex with nine setae; extremely slender from midpoint to base but abruptly widened at base. Ventrite VIII ( Fig. 23 F) well sclerotized; spiculum elongate; apex square, apical margin truncate, with dense short setae; disc with several long setae at sides. Receptacle of spermatheca ( Fig. 23 I) strongly swollen; pump much narrower and strongly curved, apically tapering; proximal spermathecal duct wide but much narrower than receptacle, deeply projecting into receptaculum.

Color variability. One female specimen possesses dark brown frons and anterior area of vertex. Another has a yellowish brown body but outer margins of the pronotum, outer margins and suture of the elytra are black, and the head is black but the labium, clypeus, and frons are yellow ( Fig. 20 E).

Differential diagnosis. Males of Doryscus wangi sp. nov. are easily distinguished from those of D. scapus by the normal first antennomeres (strongly swollen first antennomeres in D. scapus ) and characteristic structure of endophallic sclerites ( Figs 22 C–22D, 23C–23D). Females of D. wangi sp. nov. can be separated from those of D. scapus by lacking transverse dark bands on elytral bases, swollen receptacle and wide proximal spermathecal duct of the spermatheca, and the comparatively shorter first antennomere (only slightly longer than others). These are in contrast to the narrow receptacle and slender proximal spermathecal duct, and the comparatively longer first antennomere (much longer than others) of D. scapus .

Etymology. This new species is dedicated to Yu-Tang Wang who collected the type specimens.

Remarks. Males of East Malaysia with normal antennae identified as Doryscus testaceus (not studied) by Mohamedsaid (1999) are supposed to be this new species.

Distribution. East Malaysia (Sabah).

Figures

FIGURE 20. Habitus of Doryscus species, dorsal view. 20 A. D. sumatrensis Lee, sp. nov.; 20 B. D. scapus Mohamedsaid, male; 20 C. D. scapus Mohamedsaid, female; 20 D. D. wangi Lee, sp. nov.; 20 E. D. wangi Lee, sp. nov., color variation.

FIGURE 22. Diagnostic characters of Doryscus scapus Mohamedsaid. 22 A. Antenna, male; 22 B. Antenna, female; 22 C. Penis, dorsal view; 21 D. Penis, lateral view; 22 E. Gonocoxae; 22 F. Abdominal ventrite VIII. 22 G. Apical margin of abdominal ventrite V, male; 22 H. Apical margin of abdominal ventrite V, female; 22 I. Spermatheca.

FIGURE 23. Diagnostic characters of Doryscus wangi Lee sp. nov. 23 A. Antenna, male; 23 B. Antenna, female; 23 C. Penis, dorsal view; 23 D. Penis, lateral view; 23 E. Gonocoxae; 23 F. Abdominal ventrite VIII. 23 G. Apical margin of abdominal ventrite V, male; 23 H. Apical margin of abdominal ventrite V, female; 23 I. Spermatheca.