Selangomonus, Wei & Webb & Dai, 2025

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 View Fig ) ......................................... 2

– Apex of aedeagal shaft evenly tapered to acute apex in lateral view ( Fig. 5H View Fig ) ............................... 3

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

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

3. Aedeagus with preatrium very short about ⅛ length of shaft ( Fig. 11H View Fig ) ( China, Thailand) .............. ........................................................................... S. splinterus ( Li & Wang, 2005) View in CoL gen. et comb. nov.

– Aedeagus with preatrium long, ⅓ to ½ length of shaft ( Fig. 8G View Fig ) ..................................................... 4

4. Aedeagal shaft sinuate distally ( Fig. 12F View Fig ) ............................................. 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 View Fig ) ( China) .................................................. S. furcatus ( Xing & Li, 2013) View in CoL 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 View Fig ) ........................................ 7

– Subgenital plate less than 4 times as long as basal width ................................................................. 8

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

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

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

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