Orthogonius Macleay 1825
Creators: name: Tian, Ming-yi
name: Deuve, Thierry
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae
Orthogonius

description: Key to species of Orthogonius of Singapore   
1. Clypeus quadrisetose........................................................................ 2  
– Clypeus bisetose............................................................................... 4  
 2. Body rather flat and broad, reddish-brown, large (Length 20.0–21.0 mm)............................................................................. O. hopei Gray   
– Body more convex and slender, dark brown, medium sized...... 3  
 3. Elytral striae shallow, intervals flat. Length 14.0 mm........................................................................................... O. saundersi Andrewes   
 – Elytral striae deep, intervals convex. Length 14.5 mm...................................................................................... O. thaicus Tian & Deuve   
4. Ligula with glossal sclerite quadrisetose at apex, mentum with a median tooth, hind angle of pronotum angular............................ 5  
– Glossal sclerite bisetose at apex, mentum without median tooth, hind angle of pronotum rounded.................................................... 6  
 5. Head impunctate, labrum straight at front, interval 6 of elytra impunctate near base, smaller. Length 13.5–14 mm............................................................................... O. singaporensis Tian & Deuve   
 – Head sparsely punctate on vertex, labrum slightly emarginate at front, interval 6 of elytra with a few punctures near base, larger. Length 16.0– 17.5 mm....................... O. fairmairei Tian & Deuve   
6. Head punctate, interval 7 of elytra more or less carinate............ 7  
– Head impunctate, interval 7 of elytra not carinate....................... 9  
7. Head densely punctate, pronotum impunctate.............................. 8  
 – Head and pronotum sparsely punctate. Length 12.0 mm......................................................................... O. solidicornis Tian & Deuve   
 8. Labrum straight at front,the elytral base obscurely bordered,aedeagus stout. Length 15.0 mm..................... O. emarginatus, new species   
 – Labrum slightly convex at front, the elytral base unbordered against intervals 1–3, and aedeagus slender in), and aedeagus stouter.Length 13.0 mm...................................... O. andrewesianus Tian & Deuve   
 9. Elytral striae shallow, intervals slightly convex, impunctate. Length 13.5–14.0 mm.................................. O. dongnanya Tian & Deuve   
 – Elytral striae deep, intervals moderately convex; intervals 3, 5, 6 and 8 sparsely punctate, punctures small. Length 10.5 mm........................................................................ O. cyclothorax, new species
description: Published as part of Tian, Ming-yi & Deuve, Thierry, 2007, A Taxonomic Treatment Of The Species Of Orthogonius Macleay (Coleoptera: Carabidae: Orthogoniini) Of Singapore, pp. 261-266 in Raffles Bulletin of Zoology 55 (2) on page 265, DOI: 10.5281/zenodo.5333241