Gestroiella, Montandon, 1897

Dan, Polhemus, John, Polhemus & Sites, Robert, 2008, A Revision Of The Indochinese Genera Cheirochela And Gestroiella Heteroptera Naucoridae And A Review Of The Tribe Cheirochelini, Raffles Bulletin of Zoology 56 (2), pp. 255-279 : 267

KEY TO SPECIES OF GESTROIELLA

1. Small species, overall body length less than 15 mm .............. ........................................................ G. siamensis new species

– Larger species, overall body length exceeding 17 mm ........ 2

2. Median process of male genital capsule acuminate at tip, not bifurcate; females with posteromedial hair tufts on abdominal sternites IV–VI ( Fig. 32 ); Indochina ....................................... .................................................. G. limnocoroides Montandon

– Median process of male genital capsule bifurcate at tip; females with posteromedial hair tufts on abdominal sternites IV and V only, lacking a tuft on sternite VI ( Fig. 31 ); north-eastern India.......................................................... G. insignis Distant Diagnosis. – Form broadly oval to nearly round ( Fig. 18 ). Abdominal and thoracic venter with fine pile of short, closely appressed hairs. Pronotum broad, posterior width approximately 2× the width of the head ( Fig. 18 ); anterolateral angles of simple, not forming cup-shaped depressions ventrally at apices; posteriolateral angles acute but not spinose. Hemelytra of brachypterous forms long, apices angulate, reaching to or surpassing abdominal tergite VI ( Fig. 18 ). Parameres stout basally, suddenly narrowing on distal half to form a tapering arm, lacking a fringe of long setae on outer margins, apices weakly notched ( Figs. 26–28 ).

Figures

Figs. 31–33. Gestroiella species, apex of abdomen of female, ventral aspect: 31, G. insignis; 32, G. limnocoroides; 33. G. siamensis.

Fig. 18. Gestroiella siamensis new species, female, dorsal habitus. Drawn by Young Sohn.

Figs. 26–30. Gestroiella species, male genitalia, structural details: 26, G. insignis, paramere; 27, G. limnocoroides, paramere; 28, G. siamensis, paramere; 29, G. limnocoroides, phallotheca; 30, G. siamensis, dorsomedial process of genital capsule.