Selangomonus, Wei & Webb & Dai, 2025

Wei, Xingtao, Webb, Michael D. & Dai, Wu, 2025, Review of the Asian leafhopper genus Scaphomonus Viraktamath (Hemiptera: Cicadellidae: Deltocephalinae: Scaphoideini) with description of a new genus and new species, European Journal of Taxonomy 989, pp. 215-244 : 224-227

Genus Selangomonus gen. nov.

urn:lsid:zoobank.org:act:BF0C8048-B971-4EC4-825B-45E057EE2088

Type species

Selangonomus bruneiensis gen. et sp. nov.

Diagnosis

Resembling other Scaphoideus group genera in general appearance and colour marking. Head triangularly produced, similar in width to pronotum, approximately twice as long medially as next to eye; ocelli situated on anterior margin of head close to eye. Forewing with outer subapical cell extending sub-basally to near wing margin and with a reflexed costal vein. Hind tibia with row PD setae very long, more than half length of foretibia.

MALE GENITALIA. Pygofer usually without caudal process (present in S. furcatus ), with scattered macrosetae distally. Subgenital plate moderately long to long, evenly tapered to narrowly rounded apex; with several long uniseriate lateral macrosetae sub-basally to subapically and a few long fine setae at least apically. Connective Y-shaped, articulated with aedeagus; stem short usually with a lightly sclerotized lobe-like area on each side (absent in S. furcatus ). Style with well-developed preapical lobe and usually short acute apophysis (long in S. furcatus ). Aedeagal shaft elongate usually without processes (apical processes present in S. furcatus ); gonopore apical on dorsal surface; preatrium usually well developed (short in S. splinterus ); basal apodeme poorly developed.

FEMALE GENITALIA. First valvulae with dorsal sculpture concatenate to strigate. Second valvulae abruptly expanded slightly basad of midlength and gradually tapered to apex (blade-like), with approximately 20 prominent teeth; dorsal sclerotized area present.

Etymology

The genus name is derived from the place name Selangor (Peninsular Malaysia), the type locality of two of its included species.

Description

COLOURATION. Anterior margin of head with two dark brown transverse bands on either side of a pale transverse band between ocelli, and a broad transverse brown, orange or reddish band between eyes tinged with brown anteriorly. Face pale brown with variable darker brown arcs. Thorax with a transverse brown, orange or reddish band anteriorly and posteriorly on pronotum and anteriorly on scutellum. Forewings marked with brown apically and on some veins (at least in distal part of wing).

HEAD AND THORAX. Head triangularly produced, similar in width to pronotum, approximately twice as long medially than next to eye; ocelli situated on anterior margin of head close to eye. Face slightly flattened, with width (including eyes) almost equal to length; antennae located near mid-height of eye, antennal pit deep and expanded onto frontoclypeus; frontoclypeus narrow, longer than width between eyes; anteclypeus flat and slightly broadened at apex, apical margin of anteclypeus slightly exceeding the face margin; lora large.

TEGMEN. Forewing with three subapical cells; outer subapical cell extended sub-basally to near wing margin and with a reflexed costal vein.

LEG. Fore femur with IC setae long and fine, row AM with 1 stout seta, and row AV with several short stout setae in basal half; AV1 slightly more elongate and near AM1. Fore tibia rounded with one seta in row AD and four in row PD. Hind femur apical setal formula 2+2+1. Hind tibia laterally flattened and nearly straight; row AD with approximately 10 ± 1 long stout setae and 1–5 short setae between two long seta; row PD with 16 ± 1 macrosetae alternating moderately long to very long, the latter more than half length of foretibia; row AV with few long distal macrosetae and several moderately long more basal setae; row PV with several moderately long stout setae distally and numerous short fine and soft setae from midlength to sub-basally; pecten with medial seta much longer than seta on either side. Basal hind tarsomere long, pecten with three medial platellae and a tapered setae on each side; plantar surface with one row of five and one row of four stout setae.

MALE GENITALIA. Valve short, triangular. Pygofer usually without caudal process (present in S. furcatus ), with scattered macrosetae distally. Subgenital plate moderately long to long, evenly tapered to narrowly rounded apex; with several long uniseriate lateral macrosetae sub-basally to subapically and a few long fine setae at least apically. Connective Y-shaped, articulated with aedeagus; stem short usually with a lightly sclerotized lobe-like area on each side (absent in S. furcatus ). Style with well-developed preapical lobe and usually short acute apophysis (long in S. furcatus ). Aedeagal shaft elongate usually without processes (apical processes present in S. furcatus ); gonopore apical on dorsal surface; preatrium usually well developed (short in S. splinterus ); basal apodeme poorly developed.

FEMALE GENITALIA. First valvulae with dorsal sculpture concatenate to strigate. Second valvulae abruptly expanded slightly basad of midlength and gradually tapered to apex (blade-like), with several (18–20) prominent teeth; dorsal sclerotized area present.

Distribution

Mainland Asia ( China, India, Korea, Myanmar, Nepal, Thailand and Peninsular Malaysia) and in the Pacific ( Philippines, Sarawak and Brunei).

Remarks

The new genus is similar to Scaphomonus in appearance, but can be distinguished by aedeagus. Aedeagus of Scaphomonus have one or two pairs of processe and not developed preatrium.

Checklist to species of Selangomonus gen. nov.

Selangomonus bruneiensis gen. et sp. nov. Distribution. Brunei.

Selangomonus falcatus gen. et sp. nov. Distribution. Peninsular Malaysia.

Selangomonus flataedeagus ( Li, 2011) gen. et comb. nov. ( Fig. 2A–B )

Scaphomonus flataedeagus Li, 2011 in Li et al. 2011: 263, fig. 5–265.

Scaphomonus flataedeagus – Xing & Li 2013: 59, figs 1–7, 22–23.

Distribution. China.

Selangomonus furcatus (Xing & Li, 2103) gen. et comb. nov. ( Fig. 2C–D )

Scaphomonus furcatus Xing & Li, 2013: 61 , Figs 15–21, 26–27.

Distribution. China.

Selangomonus indicus ( Distant, 1908) gen. et comb. nov. Identity uncertain (see species entry below) Scaphoideus indicus Distant, 1908: 374–375 .

Distribution. Myanmar.

Selangomonus indicus ( Distant, 1908) sensu Viraktamath & Mohan 1993

Scaphotettix indicus – Viraktamath & Mohan, 1993: 464, figs 1–13.

Distribution. India.

Selangomonus indicus ( Distant, 1908) sensu Dai et al. 2009

Scaphomonus indicus – Dai et al. 2009: 661, fig. 6a–h.

Distribution. China.

Selangomonus indicus ( Distant, 1908) sensu Li et al. 2011

Scaphomonus indicus – Li et al. 2011: 261, fig. 5–262.

Distribution. China.

Selangomonus indicus (?) ( Distant, 1908). See species entry below Distribution. Nepal, Philippines.

Selangomonus longistyleus ( Li & Wang, 2005) gen. et comb. nov. ( Fig. 2E–F )

Scaphotettix longistyleus Li & Wang, 2005: 190 , figs 13–17.

Scaphomonus longistyleus – Dai et al. 2009: 661, fig. 7a–h. — Li et al. 2011: 262, fig. 5–263. — Xing & Li 2013: 60.

Distribution. China.

Selangomonus naejangsanus ( Dutta, Kwon, Suh & Kwon, 2020) gen. et comb. nov. ( Fig. 2G–H ) Scaphomonus naejangsanus Dutta, Kwon, Suh & Kwon, 2020:194 , figs 1–4, 5–12.

Distribution. Korea.

Selangomonus splinterus ( Li & Wang, 2005) gen. et comb. nov. ( Fig. 8 )

Scaphoideus festivus – Ishihara 1961: 252, figs 77–78, 83–84, misidentification.

Scaphotettix splinterus – Li & Wang 2005: 189, figs 8–12.

Scaphomonus splinterus – Dai et al. 2009: 662, fig. 8a–h. — Li et al. 2011: 263, fig. 5–264. — Xing & Li 2013: 60.

Distribution. China, Thailand.

Selangomonus undulatus gen. et sp. nov. Distribution. Peninsular Malaysia.

Key to species of Selangomonus gen. nov.

Selangomonus indicus , of uncertain identity (from Myanmar), is omitted from the key and replaced with tentatively identified specimens from elsewhere in Asia. See Remarks under Selangomonus indicus and S. indicus (?) for explanation.

1. Apex of aedeagal shaft compressed and broad in lateral view ( Fig. 9G ) ......................................... 2 – Apex of aedeagal shaft evenly tapered to acute apex in lateral view ( Fig. 5H ) ............................... 3

2. Aedeagal shaft abruptly tapered subapically in ventral view ( Fig. 4A ) ( China) ................................ ..................................................................................... S. flataedeagus ( Li, 2011) gen. et comb. nov.

– Aedeagal shaft gradually tapered to apex in ventral view ( Fig. 9H ) (Asia) ....................................... ................................................................................. S. indicus (?) ( Distant, 1908) gen. et comb. nov.

3. Aedeagus with preatrium very short about ⅛ length of shaft ( Fig. 11H ) ( China, Thailand) .............. ........................................................................... S. splinterus ( Li & Wang, 2005) gen. et comb. nov. – Aedeagus with preatrium long, ⅓ to ½ length of shaft ( Fig. 8G ) ..................................................... 4

4. Aedeagal shaft sinuate distally ( Fig. 12F ) ............................................. S. undulatus gen. et sp. nov. – Aedeagal shaft evenly curved distally .............................................................................................. 5

5. Pygofer with caudal process; style apophysis longer than rest of style; aedeagus with apex bifid ( Fig. 4D ) ( China) .................................................. S. furcatus ( Xing & Li, 2013) gen. et comb. nov.

– Pygofer without caudal process; style apophysis moderately long, length much less than rest of style ................................................................................................................................................... 6

6. Subgenital plate approximately 4 times as long as basal width ( Fig. 5K ) ........................................ 7 – Subgenital plate less than 4 times as long as basal width ................................................................. 8

7. Anal tube not exceeding pygofer caudal margin ( Fig. 8I ); aedeagal shaft strongly bent dorsally at midlength ( Fig. 8G ) (Peninsular Malaysia) .............................................. S. falcatus gen. et sp. nov.

– Anal tube exceeding pygofer caudal margin ( Fig. 5J ); aedeagal shaft weakly bent dorsally at about distal one-third ( Fig. 5G ) ( Brunei) ...................................................... S. bruneiensis gen. et sp. nov.

8. Aedeagal shaft filamentous, sinuate distally in lateral view ( Fig. 4F ) ( China) .................................. ........................................................................ S. longistyleus ( Li & Wang, 2005) gen. et comb. nov.

– Aedeagal shaft robust, evenly curved distally in lateral view ( Fig. 4G ) ( Korea) ............................... ........................................... S. naejangsanus ( Dutta, Kwon, Suh & Kwon, 2020) gen. et comb. nov.

Figures

Fig. 2. A–C, E–K. Scaphomonus bispinosus sp. nov., holotype, ♂ (BMNH). D. Specimen ♀ (BMNH). A–B. Habitus, dorsal and lateral views, respectively. C. Face, ventral view. D. Pregenital (VII) sternite. E–F. Aedeagus, lateral and dorsal view respectively. G. Style, ventral view.H–I. Connective, lateral and ventral view respectively. J. Male pygofer and anal tube, lateral view. K. Subgenital plates and valve, ventral view.

Fig. 8. Selangomonus falcatus gen. et sp. nov., holotype, ♂ (BMNH). A–B. Habitus, dorsal and lateral view respectively. C. Face, ventral view. D–E. Connective, lateral and ventral view respectively. F. Style, ventral view. G–H. Aedeagus, lateral and ventral view respectively. I. Male pygofer and anal tube, lateral view. J. Valve and subgenital plates, ventral view.

Fig. 9. Selangomonus indicus(?) (Distant, 1908) gen. et comb. nov., Philippines (BMNH).A–B. Habitus, dorsal and lateral view respectively. C. Face, ventral view. D. Female pregenital (VII) sternite. E–F. Connective, ventral and lateral view respectively. G–H. Aedeagus, lateral and ventral view, respectively. I. Style, ventral view. J. Male pygofer and anal tube, lateral view. K. Valve and subgenital plates ventral view.

Fig. 5. A–C, E–K. Selangomonus bruneiensis gen. et sp. nov., holotype, ♂ (BMNH). D. Specimen ♀ (BMNH). A–B. Habitus in dorsal and lateral view, respectively.C. Face, ventral view.D. Pregenital (VII) sternite. E. Style, ventral view. F–G. Connective, lateral and ventral view respectively. H–I. Aedeagus, lateral and ventral view respectively. J. Male pygofer and anal tube, lateral view.K. Valve and subgenital plates ventral view.

Fig. 4. Aedeagus of species of Selangomonus gen. nov.A–F. Dorsal and lateral view, respectively.G–H. Ventral and lateral view, respectively. A–B. S. flataedeagus (Li, 2011) gen. et comb. nov., modified after Li et al. (2011). C–D. S. furcatus (Xing & Li, 2013) gen. et comb. nov., modified after Xing & Li (2013). E–F. S. longistyleus (Li & Wang, 2005) gen. et comb. nov., modified after Dai et al. (2009). G–H. S. naejangsanus (Dutta, Kwon, Suh & Kwon, 2020) gen. et comb. nov., modified after Dutta et al. (2020).

Fig. 11. Selangomonus splinterus (Li & Wang, 2005) gen. et comb. nov. (BMNH). A–B. Habitus, dorsal and lateral view respectively. C. Face, ventral view. D–E. Connective, lateral and ventral view respectively. F–G. Style, ventral and lateral view respectively. H–I. Aedeagus lateral and ventral view respectively. J. Male pygofer and anal tube, lateral view. K. Valve and subgenital plates, ventral view.

Fig. 12. A–C, E–K. Selangomonus undulatus gen. et sp. nov., holotype, ♂ (BMNH). D. Specimen ♀ (BMNH), A–B. Habitus, dorsal and lateral views respectively. C. Face, ventral view. D. Pregenital (VII) sternite. E. Style, ventral view. F–G. Aedeagus and connective, lateral and ventral view respectively. H–I. Connective, lateral and ventral view respectively. J. Male pygofer and anal tube, lateral view. K. Subgenital plates and valve, ventral view.