Rhyacobates gongvo Tran & Yang, 2006

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 : 47-48

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.10063667
persistent identifier	https://treatment.plazi.org/id/045E878D-FFF2-2914-3A35-FB0A72A90B4E
treatment provided by	Plazi
scientific name	Rhyacobates gongvo Tran & Yang, 2006
status

Treatment

Rhyacobates gongvo Tran & Yang, 2006 View in CoL

Figs 3K View Fig , 4H View Fig , 5J View Fig , 7A View Fig

Rhyacobates gongvo Tran & Yang, 2006: 16–19 View in CoL , figs 17–25, 28 (original description).

Rhyacobates gongvo View in CoL – Tran & Nguyen 2016: 513 View Cited Treatment , figs 41–42 (with remarks).

Diagnosis

Body length of apterous females 7.80–8.30, of apterous males 6.20–6.50. Color ( Figs 3K View Fig , 4H View Fig ): head yellow with black markings; pronotum: of female with a large subtriangular yellow marking, of male with subovate yellow spot; in apterous form, mesonotum with yellow median stripe; metanotum: of female completely black, without yellow markings, of male chiefly black, usually with very thin yellow median stripe. Female: abdomen elongate and straight ( Fig. 5J View Fig ); ventral length of pregenital abdomen about 0.4 times body length; posterior part of abdominal segment VII slightly depressed dorso-ventrally; connexival processes of segment VII long, straight, flat ( Fig. 3K View Fig ); sternum VII not totally enclosing genital segments, posterior margin straight, without process ( Fig. 3K View Fig ). Male: length of middle tibia ca 2.1 times length of hind tibia; pygophore simple; proctiger with angular lobes laterally ( Fig. 7A View Fig ); paramere slender, strongly curved at basal third, then tapering towards narrow apex.

Material examined

Type specimens

See Tran & Yang (2006).

Non-type specimens

VIETNAM • 1 ♁, 1 ♀ (apterous); Lào Cai Province, Sa Pa, Cát Cát, Ho stream (feeder stream of Mường Hoa stream); 22°19′32.9″ N, 103°49′52.9″ E; 27 Oct. 2020; A.D. Tran leg.; TAD20-23; ZVNU GoogleMaps • 1 ♀ (apterous); same collection data as for preceding; NKUM GoogleMaps .

GPS data of previous records: see Tran & Yang (2006), Tran & Nguyen (2016).

Distribution

Vietnam: Lào Cai ( Tran & Yang 2006; Tran & Nguyen 2016).

Comparative notes

This species is most similar to R. malaisei , which was discussed by Tran & Yang (2006: 18–19). Here, we provide further comparative notes between the two species. Rhyacobates gongvo and R. malaisei share the following characteristics of the female: (1) the metanotum is completely black, without yellow markings ( Fig. 3K, M View Fig ); (2) the abdomen is relatively straight and elongate; (3) the connexiva of abdominal segments I–VI are blackish, forming straight lines in dorsal view ( Fig. 3K, M View Fig ); (4) abdominal segment VII has a pair of pointed or angular lateral processes ( Figs 3K View Fig , 5J, L View Fig , 30G View Fig ); and (5) the posterior margin of sternum VII is truncate or slightly sunken, without a median process ( Fig. 30F View Fig ). The key differences between these two species are as follows: in the female of R. gongvo , the connexiva of abdominal segment VII do not meet each other over the dorsum ( Fig. 3K View Fig ), whereas in the female of R. malaisei , the connexiva of abdominal segment VII are more developed, curved mesad and meeting over the middle of the abdominal dorsum ( Figs 3M View Fig , 30D–E View Fig ). In the male of R. gongvo , the lateral lobes of the proctiger are angular ( Fig. 7A View Fig ), whereas in R. malaisei , each lateral lobe of the proctiger has an angular process directed ventrad ( Figs 7C View Fig , 30K View Fig ).