Physoderes nigripennis Hwang & Weirauch 2017, sp. nov.

Physoderes nigripennis sp. nov.

urn:lsid:zoobank.org:act: 0B62A6F5-805D-41F6-AC29-EB6DDE0144C8

Figs 8, 15, 18–20; Appendix

Diagnosis

This species is recognized among congeners by the elongate conical head, which is densely covered in fine, curved setae, the scape reaching the apex of the clypeus, the eye being distinctly projecting, the antero-lateral pronotal projection being truncate, the anterior pronotal lobe distinctly narrower than the posterior lobe and covered with fine, curved setae along its ridges, the parascutellar lobe rounded and skewed towards median, the apex of the scutellar process straw-colored, the costal margin of the hemelytron black, the connexivum undulating with the posterior margin slightly elevated and beset with short, curved setae, the arms of the basal plate of the articulatory apparatus of the male genitalia being curved and the dorsal phallothecal sclerite being subacute, with lateral rounded plates extending to the lateral surface.

Etymology

The name nigripennis is after the Latin adjective “nigripennis”, meaning with black wings or feathers, to describe the overall black coloration of the hemelytron.

Material examined

Holotype

INDONESIA: ♂, Sumatra, Sumatera Barat (West Sumatra), 0.74° N, 100.8° E, no date provided, E. Jacobson leg. (UCR_ENT 00023968) (RMNH).

Paratypes

INDONESIA: Sumatra, Sumatera Barat (West Sumatra): 1 ♂, Fort de Kock, 0.26694° N, 100.38333° E, 920 m, 1925, E. Jacobson leg. (UCR _ENT 00023962) (RMNH); 4 ♂♂, same collection data as preceding but 1926 (UCR _ENT 00023954– UCR _ENT 00023956, UCR _ENT 00014055) (RMNH); 1 ♂, Fort de Kock (Bukittinggi), 0.3167° N, 100.3667° E, 920 m, Nov. 1920, E. Jacobson leg. (UCR _ ENT 00068913) (AMNH).

Other material

INDONESIA: Sumatra, Sumatera Barat (West Sumatra): Fort de Kock, 0.26694° N, 100.38333° E, 920 m, 1924, E. Jacobson leg. (UCR _ENT 00023987) (RMNH); 2 ♀♀, same collection data as preceding but 1926 (UCR _ENT 00023985, UCR _ENT 00023986) (RMNH); 1 ♀, same collection data as preceding but 1925 (UCR _ENT 00069414) (BMNH); 9 ♂♂, same collection data as precding (UCR _ENT 00023957– UCR _ENT 00023961, UCR_ENT 00023963– UCR _ENT 00023966) (RMNH); 8 ♀♀, same collection data as preceding (UCR _ENT 00023977– UCR _ENT 00023984) (RMNH); 1 ♂, Fort de Kock (Bukittinggi), 0.26768° S, 100.38394° E, Nov. 1913, E. Jacobson leg. (UCR _ENT 00023975) (RMNH); 1 ♀, same collection data as preceding (UCR _ENT 00023995) (RMNH); 1 ♂, Gunning Singgalang, 0.39° S, 100.33083° E, 1200 m, 1925, E. Jacobson leg. (UCR _ENT 00023974) (RMNH); 1 ♀, Gunung Singgalang, 1000 m, 1925, E. Jacobson leg. (UCR _ENT 00023994) (RMNH); 1 ♂, Fort de Kock (Bukittinggi), 0.3167° N, 100.3667° E, 920 m, Nov. 1920, E. Jacobson leg. (UCR _ ENT 00068912) (AMNH); 2 ♀♀, same collection data as preceding (UCR _ENT 00068914, UCR _ENT 00068915) (AMNH). – Sumatra, Riau Province: 6 ♂♂, 0.74° N, 100.8° E, no date provided, E. Jacobson leg. (UCR _ENT 00023967, UCR _ENT 00023969– UCR _ENT 00023973); 7 ♀♀, same collection data as preceding (UCR _ENT 00023988– UCR _ENT 00023993, UCR _ENT 00023996) (RMNH). – Sumatra, Sumatera Utara (North Sumatra): 1 ♂, Lake Toba, 2.59194° N, 98.82805° E, 1167 m, no date provided, B. Hagen leg. (UCR _ENT 00023976) (RMNH).

Description

Male

BODY LENGTH. Medium, total length 9.12 mm, SD ± 0.29 (Appendix).

COLORATION (Figs 15, 18). Brown and dark brown. Head brown with straw-colored setae. Antenna light brown. First segment of labium brown, second segment straw-colored, apically brown, third segment brown. Anterior lobe of pronotum dark brown with brown or light brown markings, posterior lobe brown, scutellum basally brown, apically straw-colored including scutellar process, pleuron brown, sternum brown. Corium of hemelytron reddish-brown with black costal margin, membrane brownishblack. Femora of legs straw-colored with medial and apical brown annulations, tibiae basally brown, apically straw-colored, tarsi and claws light brown. Abdomen dorsally yellowish-orange, ventrally light brown medially and straw-colored laterally with brown suffusion, anterior two-thirds of connexivum brownish-black, posterior third straw-colored, exposed part of pygophore dark brown.

VESTITURE. Generally setose. Head with widespread curved setae, ventral surface of postocular lobe with sparse, setigerous tubercles, without pair of long, straight setae on postocular lobe posterior to ocelli. Anterior lobe of thorax with irregular row of tuberculated, short, curved setae on lateral margins and curved setae on anterior portion of dorsal surface, posterior lobe with widespread short, curved setae. Corium of hemelytron with short, curved setae. Legs with two rows of spines and setigerous tubercles, tibia with regular rows of tuberculated, stout, sharp setae. Posterior margin of connexivum of abdomen with short, curved setae.

HEAD. Elongate conical; maxillary plate truncate apically; scape reaching apex of clypeus; eye distinctly projecting in dorsal view, less than 1/5 length of head.

THORAX. Antero-lateral paired projections truncate; surface of anterior lobe with raised ridges; median pronotal depression contiguous with transverse sulcus; paramedian carina strongly defined; anterior pronotal lobe shorter and narrower than posterior lobe, lower than posterior lobe in lateral view; parascutellar lobe rounded, skewed towards median; scutellum rounded triangular, scutellar process long, apex subacute.

HEMELYTRON. Reaching tip of abdomen.

LEGS. Same as genus description.

ABDOMEN. Connexival margin undulating, posterior margin slightly elevated.

GENITALIA. Transverse bridge of pygophore broad, margin of anterior opening angular, apodeme present, apical margin of posterior opening smooth; cup-like sclerite apically rounded, with adjacent paired round protuberances; arms of basal plate rounded; ductifer membranous; endosomal struts conical, with subacute apex, divided into two arms basally; shape of dorsal phallothecal sclerite subacute with lateral broad, plate-like prolongations, with short, rounded lateral plates at apex.

Female Similar to male.

Ecology

This species was collected at relatively high altitudes of 920–1200 m.

Distribution

This species is found only in the central west region of Sumatra Island, where most specimens were collected from Bukit Tinggi, formerly Fort de Kock.

Remarks

This species is the most commonly collected on the island of Sumatra. It is placed within the Physoderes clade in the phylogenetic analysis above because of the shared synapomorphies of having the scape reaching the apex of the clypeus, rounded parascutellar lobes skewed toward the median and a membranous ductifer of the male genitalia.