Rheumatogonus vietnamensis Zettel & Chen, 1996

Jehamalar, E. Eyarin & Chandra, Kailash, 2020, A new species of Tenagogonus Stål (Hemiptera: Heteroptera: Gerridae) and first records of eight species of aquatic and semi-aquatic Heteroptera from India, Zootaxa 4718 (1), pp. 95-107: 104-105

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Rheumatogonus vietnamensis Zettel & Chen, 1996


Rheumatogonus vietnamensis Zettel & Chen, 1996 

( Figs. 1View FIGURES 1 L–M)

1996. Rheumatogonus vietnamensis Zettel & Chen  : Entomologische Abhandlungen, Staatliches Museum für Tierkunde Dresden, 57 (6), 171.

Material examined. INDIA, MEGHALAYA, East Khasi Hills District, 1 apt. ♂, 1 apt. ♀, Shella Bazar, a stream near Shella River , 23 m  , 25.18094° N, 91.63533° E, 6.iii.2016, Coll. E.E. Jehamalar. Reg. No. 9373/H15.

Diagnosis. Rheumatogonus vietnamensis  can be identified by the indistinct anterolateral patch of medium sized setae on the mesosternum (only visible in alcohol), absence of prominent setae on the mesal margin of the connexivum of the female; presence of a basolateral triangular process of the ventral sclerite and the distinct accessory lateral sclerite of the male endosoma.

Distribution. India (Meghalaya, Fig. 4BView FIGURES 4), Cambodia, Thailand, Vietnam, Laos, Indonesia (Natuna Island) ( Chen & Nieser 2002, Tran & Yang 2004, Zettel et al. 2017).

Remarks. Abdominal tergum VII of the female is erected posteriorly giving a hump-like appearance in lateral view; this character is not mentioned in the original description of the species. Only a pair of specimens was available for the present study, so the characters should be studied thoroughly.