A Revision Of The Indochinese Genera Cheirochela And Gestroiella Heteroptera Naucoridae And A Review Of The Tribe Cheirochelini Author Dan Author Polhemus Author John Author Polhemus Author Sites, Robert text Raffles Bulletin of Zoology 2008 2008-08-31 56 2 255 279 journal article 10.5281/zenodo.5340370 2345-7600 5340370 KEY TO SPECIES OF CHEIROCHELA 1. Large, robust species, body length usually exceeding 26 mm ; overall body form broad ( Fig. 2 ), ratio of total body length/ body width across embolia falling in range of 1.50–1.65/1.00; posterolateral angles of pronotum highly produced and acuminate, ratio of maximum pronotal width/pronotal length along midline in submacropterous individuals falling in range of 3.78–4.21; male paramere shape as in Fig. 8 .................... ................................................................ C. feana Montandon – Slightly smaller and more elongate species, body length usually less than 26 mm ; overall form more elongate ( Fig. 2 ), ratio of total body length/body width across embolia falling in range of 1.74–1.95/1.00; posterolateral angles of pronotum only moderately produced, not highly acuminate, ratio of maximum pronotal width/pronotal length along midline in submacropterous individuals falling in range of 3.15–3.60 ............................ 2 2. Abdominal sternite V lacking a posteriorly directed medial tubercle; medial tubercle on sternite IV small and flattened, usually not projecting posteriorly over the base of sternite V when viewed laterally; preocular head 0.8 × the inner length of an eye or greater ( Fig. 2 ); male paramere shape as in Fig. 10 ; northern Vietnam ........................ C. tonkina new species – Abdominal sternite V with a well developed, posteriorly developed medial tubercle, tip of this tubercle sharply angulate ( Figs. 5, 6 ); medial tubercle on segment IV also well developed, raised and angulate ( Fig. 6 ), often projecting over base of sternite V when viewed laterally; preocular head 0.7 X the inner length of an eye or less; Burma , Thailand , or northeastern India .. 3 3. Smaller species, body length less than 22 mm ; medial tubercles on abdominal sternites IV and V not strongly produced posteriorly or projecting over basomedial sections of subsequent sternites ( Figs. 5, 6 ); male paramere bearing a short, thumb-like process on basal half separated from main body of paramere by a deep incision ( Fig. 7 ); Bramaputra River basin of northeastern India ........................................................ C. assamensis Hope – Larger species, body length exceeding 23.5 mm ; medial tubercles on abdominal sternites IV and V produced posteriorly over bases of following segments when viewed laterally; male paramere lacking a short, thumb-like process on basal half separated from main body of paramere by a deep incision ( Figs. 9, 11 ); Burma , Laos and Thailand ........................................ 4 4. Anterolateral angles of pronotum strongly produced and spinose; male paramere lacking a deep notch at apex ( Fig. 9 ); medial process of genital capsule notched at apex (Fig. 13); Burma and Laos .................................... C. birmaniensis Montandon – Anterolateral angles of pronotum sharply angulate, but not strongly produced and spinose; male paramere bearing a deep notch at apex ( Fig. 11 ); medial process of genital capsule with apex truncate, not notched (Fig. 15); Thailand and Laos ....... ..................................................... C. thailandana new species