Guide To The Aquatic Heteroptera Of Singapore And Peninsular Malaysia. Xi. Infraorder Nepomorpha- Families Naucoridae And Aphelocheiridae Author Polhemus, Dan A. Author Polhemus, John T. text Raffles Bulletin of Zoology 2013 2013-08-30 61 2 665 686 journal article 10.5281/zenodo.5352700 2345-7600 5352700 KEY TO SPECIES OF CTENIPOCORIS occurring in Southeast Asia (based on characters presented in Zettel, 2012 ) 1. Smaller species, body length 7.9–8.4 mm , width of pronotum 3.9–4.2 mm ; sides of pronotum curving weakly downward, ventral pronotal surface nearly flat .... C. asiaticus Montandon – Larger species, body length 9.4 mm , width of pronotum 4.7 mm ; sides of pronotum curving strongly downward, ventral pronotal surface distinctly concave................ C. sinicus Zettel