Hydrometra okinawana Drake, 1951

Yang, Chang Man & Zettel, Herbert, 2005, Guide To The Aquatic Heteroptera Of Singapore And Peninsular Malaysia. V. Hydrometridae, Raffles Bulletin of Zoology 53 (1), pp. 79-97 : 85

publication ID	https://doi.org/ 10.5281/zenodo.13245098
DOI	https://doi.org/10.5281/zenodo.13245596
persistent identifier	https://treatment.plazi.org/id/32753044-FFC6-FFA7-B389-2DF9FA63F5AE
treatment provided by	Felipe
scientific name	Hydrometra okinawana Drake, 1951
status

Treatment

Hydrometra okinawana Drake, 1951 View in CoL

Hydrometra okinawana Drake, 1951: 101 View in CoL

Hydrometra yasumatsui Miyamoto, 1964: 214 View in CoL ; syn. Polhemus, 1992. Hydrometra okinawana Polhemus, 1992: 438 View in CoL .

Hydrometra akekawati Sites & Polhemus, 2003: 138 View in CoL , syn.n.

We have compared the characters of paratypes of H. yasumatsui Miyamoto, 1964 View in CoL (in ZRC) and H. akekawati Sites & Polhemus, 2003 View in CoL (in NHMW) and recognized the two taxa as conspecific. According to Polhemus (1992) H. yasumatsui View in CoL is a junior synonym of H. okinawana Drake, 1951 View in CoL , therefore H. okinawana View in CoL is the correct name for that species. Hydrometra okinawana View in CoL and H. yasumatsui View in CoL were described from Japan and were unknown from the Oriental fauna and for this reason they are not treated in the revision by Polhemus & Polhemus (1995). Although it apparently is a rare species, we were able to record H. okinawana View in CoL from West Malaysia, Singapore, and Borneo. Hydrometra akekawati View in CoL was described from northeastern Thailand. Sites & Polhemus (2003) described the “micropterous form” and stated that the brachypterous and macropterous forms are unknown. Because all Oriental species are either monomorphic or have a micropterous/ macropterous or brachypterous/macropterous wing dimorphism, this statement may lead to the assumption that H. akekawati View in CoL belongs to that species group, which consists of the (predominantly) micropterous species H. mindoroensis Polhemus, 1976 View in CoL , H. cracens Polhemus & Polhemus, 1995 View in CoL , and H. chaweewanae Sites & Polhemus, 2003 View in CoL . However, using the terminology of Polhemus & Polhemus (1995), the type material of H. akekawati View in CoL is brachypterous: “Mesothoracic wing extending posteriorly to level of anterior end of connexiva.” (Sites & Polhemus, 2003). Therefore, H. okinawana View in CoL ( = yasumatsui View in CoL = akekawati View in CoL syn.n.) is eventually more closely related with H. jaczewskii Lundblad, 1933 View in CoL .