Doryscus boreri , Lee, Chi-Feng, 2017

Lee, Chi-Feng, 2017, Revision of the genus Doryscus Jacoby (Coleoptera: Chrysomelidae: Galerucinae), Zootaxa 4269 (1), pp. 1-43: 32-35

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Doryscus boreri

sp. nov.

Doryscus boreri  sp. nov. ( Figs 16View FIGURE 16 B –16D, 18)

Doryscus testaceus: Jacoby, 1896a: 498  . Misidentification

Types (n= 4). Holotype ♂ ( NHMB): INDONESIA. Sumatra  : Jambi pr.: Kerinci Seblat N. P.; 7km E Kayuaro   ; Mt. Tujuh ; 1750± 250m; 1°45’S 101°25’E; 25.II.–2.III.2003, leg. Dembický. Paratypes: 2♀ ( NHMB), same data as holotypeGoogleMaps  ; 1♀ ( BMNH), Si-Rambe , XII.1890  – III.1891, leg. E. Modgliani, Jacoby Coll. 1909-28 a, with another label: “Museo Civ. Genova”.

Description. Length 4.0– 4.9 mm, width 1.8–2.0 mm. General color yellow; head black but yellow above eyes; elytral suture, lateral and basal margin black but apically abbreviated; meso- and metathoracic, and abdominal ventrites blackish brown; apices of hind femora, and tarsi darkened ( Fig. 16View FIGURE 16 B). Antennae filiform, antennomere I not modified in males ( Fig. 18View FIGURE 18 A), length ratios of antennomeres I –XI 1.0: 0.4: 0.7: 0.7: 0.8: 0.8: 0.8: 0.8: 0.8: 0.8: 0.7, length to width ratios of antennomeres I –XI 3.9: 1.8: 3.1: 3.4: 3.4: 4.3: 4.1: 4.0: 3.9: 3.9: 4.6; narrower in females ( Fig. 18View FIGURE 18 B), length ratios of antennomeres I –XI 1.0: 0.4: 0.7: 0.8: 0.8: 0.9: 0.9: 0.8: 0.8: 0.8: 1.0, length to width ratios of antennomeres I –XI 3.9: 1.9: 3.8: 4.7: 4.8: 4.9: 5.0: 4.8: 4.8: 4.7: 5.5. Elytra 1.7 x longer than wide, with erect setae dense and elongate, puncutres fine. Apical margin of last abdominal ventrite with two shallow incisions in males ( Fig. 18View FIGURE 18 G); but widely rounded in female ( Fig. 18View FIGURE 18 H). Penis ( Figs 18View FIGURE 18 C – 18D) extremely slender, 7.4 x longer than wide, parallel-sided, apex of dorsal surface tapering, with membranous opening; apex of ventral surface with short median groove; straight in lateral view, apex with groove between dorsal and ventral surface; ventral surface smooth. Internal sac with endophallic spiculae elongate, about 0.8 x as long as penis, apices trilobed, median lobe extremely slender, strongly and apically curved, with cluster of at base, lateral lobes deeply bifurcate, elongate with apices swollen and circular, with dense long setae along inner margin at middle; five pairs of short, horn-like spiculae at middle, posterior pair largest; with a short erect horn-like spicula at middle. Gonocoxae ( Fig. 18View FIGURE 18 E) extremely slender, 7.2 x longer than wide, sides slightly narrowed at apical 1/10; apices narrowed rounded; inner margins narrowly approximate from apex to midpoint, apex with nine setae; extremely slender from midpoint to base but abruptly widened at base. Ventrite VIII ( Fig. 18View FIGURE 18 F) well sclerotized; spiculum elongate; apex square, apical margin truncate, with sparse short setae; disc with several long setae at sides. Receptacle of spermatheca ( Fig. 18View FIGURE 18 I) strongly swollen; pump much narrower and strongly curved, apically tapering; proximal spermathecal duct slender, basally widened, deeply projecting into receptaculum.

Color variability. Extremely variable. One female has a yellow abdomen and yellow elytra with a wide transverse black stripe along the base and one pair of large black spots near the apices, head black except above eyes, metathoracic ventrites black except bases ( Fig. 16View FIGURE 16 C). Another female has a yellow body with black mouthparts, frons, and anterior area of the vertex ( Fig. 16View FIGURE 16 D).

Differential diagnosis. Doryscus boreri  sp. nov. adults can be distinguished those of D. sumatrensis  sp. nov. by color patterns, although the former display color variation. Doryscus boreri  sp. nov. adults have black anterior areas of the heads but the heads are totally yellow in D. sumatrensis  sp. nov. In addition, both species are easily identified by the characteristic structure of the endophallic sclerites within the penis. Females of both species can be separated by the morphology of the spermathecae: with the base of the proximal spermathecal duct in D. sumatrensis  sp. nov. wide in contrast to the moderately wide base of that structure in D. boreri  sp. nov.

Remarks. Two specimens collected from Si-Rambe were misidentified as Doryscus testaceus  by Jacoby (1896). They are members of D. boreri  sp. nov. and D. sumatrensis  sp. nov. respectively. Etymology. This new species is dedicated to Matthias Borer (Curator, NHMB), who encouraged me to study leaf beetles.

Distribution. Indonesia (Sumatra).


Naturhistorisches Museum, Basel














Doryscus boreri

Lee, Chi-Feng 2017

Doryscus testaceus:

Jacoby 1896: 498