Rhyacobates angustus Tran & Nguyen, 2016

Leng, Zhaoqi, Tran, Anh Duc & Ye, Zhen, 2023, Taxonomic review of Rhyacobates Esaki, 1923, with descriptions of three new species (Hemiptera: Heteroptera: Gerridae), European Journal of Taxonomy 893 (1), pp. 1-73 : 37

publication ID	https://doi.org/ 10.5852/ejt.2023.893.2285
publication LSID	lsid:zoobank.org:pub:D9DA4879-BC1D-4947-96E8-7D574DE334BA
DOI	https://doi.org/10.5281/zenodo.10063658
persistent identifier	https://treatment.plazi.org/id/045E878D-FFF8-291F-3A11-FE0174A3093C
treatment provided by	Plazi
scientific name	Rhyacobates angustus Tran & Nguyen, 2016
status

Treatment

Rhyacobates angustus Tran & Nguyen, 2016 View in CoL

Figs 3G View Fig , 5F View Fig , 6F View Fig , 24 View Fig

Rhyacobates angustus Tran & Nguyen, 2016: 502–503 View in CoL , figs 1–10 (original description).

Diagnosis

Body length of apterous female 11.30 (holotype), of apterous males 7.70–8.10. Color ( Figs 3G View Fig , 24B View Fig ): dorsum of head yellow with a median longitudinal dark marking on anterior three quarters; thorax of female with a broad median yellow marking on pronotum (about one third of pronotal width), a relatively broad median yellow stripe on posterior four-fifths of mesonotum, and a median yellow marking on metanotum; thorax of male with with a narrow median yellow marking on pronotum, a narrow yellow median stripe on posterior four-fifths of mesonotum, and without yellow markings on metanotum. Female: ventral length of pregenital abdomen about two-thirds body length; connexivum of abdominal segments I–VI widened; abdominal segment VII elongate, dorso-ventrally depressed, with a pair of broad, subtriangular connexival processes ( Figs 5F View Fig , 24A View Fig ); posterior margin of sternum VII convex and widened. Male: middle trochanter without spines; small spines at basal fifth of middle femur not arranged in distinct row and those at distal four-fifths arranged in distinct row ( Fig. 24C View Fig ); length of middle tibia ca 1.6 times length of hind tibia; abdomen relatively short, posterior segments slightly curved ventrad; pygophore simple, with rounded apical margin; proctiger with rounded lobes laterally ( Fig. 6F View Fig ); paramere relatively slender, curved at basal third, slightly thicker at middle part, and apex narrow and directed mesad.

Material examined

Type specimens ( Fig. 24 View Fig )

See Tran & Nguyen (2016).

Distribution

Vietnam: Lào Cai ( Tran & Nguyen 2016).

Comparative notes

Rhyacobates angustus resembles R. zetteli , as discussed by Tran & Nguyen (2016: 503, 507–508). It is also similar to R. bui sp. nov. and R. elongatus sp. nov.; see comparative notes under R. bui .