Onychocamptus Daday, 1903 from Thailand, with descriptions of two new species and two new records (Crustacea, Copepoda, Harpacticoida, Laophontidae)

Abstract

In this paper, two new species of Onychocamptus Daday, 1903 are described from Thailand: Onychocamptussatunensissp. n. and Onychocamptustratensissp. n. The following features mainly distinguish O.satunensissp. n. from known species: internal sausage-like and internal rounded structures on cephalothorax and one outer seta on the male P5 exopod that is as long as the supporting segment. In contrast, the cephalothorax of O.tratensissp. n. is smooth but has rounded integumental window-like structures, and the outer seta on the male P5 exopod is two times as long as the supporting segment. Onychocamptusanomalus shows the highest similarity with the two new species, but in contrast to both Thai species, it has only one seta on the exopod of the antenna. In addition, in the present study, two additional species, O.bengalensis and O.vitiospinulosa, are newly recorded in Thailand. Thus, the number of Onychocamptus species recorded in Thailand increases to five species. A key to all known species of this genus in the world is also proposed.

A new species of Boholina (Crustacea, Copepoda, Calanoida) and a first record for stygobiotic calanoid fauna from a cave in Thailand

“…The study of the Copepoda diversity in Southeast Asia is progressing rapidly due to an intensive program coordinated by Prof. La-orsri Sanoamuang and her colleagues. During 12 years of intensive sampling of cave-dwelling copepods in Thailand and Vietnam, many new Cyclopoida and Harpacticoida have been presented to science (Brancelj et al 2010;Watiroyram et al 2012Watiroyram et al , 2015aWatiroyram et al , 2015bWatiroyram et al , 2017Boonyanusith et al 2013Boonyanusith et al , 2018aBoonyanusith et al , 2018bWatiroyram and Brancelj 2016;Karanovic et al 2017;Watiroyram 2018aWatiroyram , 2018bSanoamuang et al 2019). Among Cyclopoida, two endemic genera from Thailand and Vietnam were established, including Siamcyclops Boonyanusith, Sanoamuang & Brancelj, 2018, and Pseudograeteriella Sanoamuang, Boonyanusith & Brancelj, 2019(Boonyanusith et al 2018bSanoamuang et al 2019).…”

Figure 6 from: Boonyanusith C, Athibai S (2021) A new species of Rangabradya (Copepoda, Harpacticoida, Ectinosomatidae) from a cave in Satun Province, southern Thailand. ZooKeys 1009: 45-66. https://doi.org/10.3897/zookeys.1009.54554

“…A rich diversity of fauna endemic to the country is expected for Satun Province, where several new taxa have recently been discovered from karstic areas (e.g., Sumontha et al 2014;Liu et al 2017;Nilsai et al 2017;Promdam et al 2017). To date, two new copepod species from this province have been described, namely, Onychocamptus satunensis Boonyanusith, Saetang, Wongkamhaeng & Maiphae, 2018 and Boholina laorsriae Boonyanusith, Wongkamhaeng & Athibai, 2020(Boonyanusith et al 2018, 2020. The latter is the first record of the subterranean Calanoida in Thailand.…”

Figure 10 from: Boonyanusith C, Athibai S (2021) A new species of Rangabradya (Copepoda, Harpacticoida, Ectinosomatidae) from a cave in Satun Province, southern Thailand. ZooKeys 1009: 45-66. https://doi.org/10.3897/zookeys.1009.54554

“…A rich diversity of fauna endemic to the country is expected for Satun Province, where several new taxa have recently been discovered from karstic areas (e.g., Sumontha et al 2014;Liu et al 2017;Nilsai et al 2017;Promdam et al 2017). To date, two new copepod species from this province have been described, namely, Onychocamptus satunensis Boonyanusith, Saetang, Wongkamhaeng & Maiphae, 2018 and Boholina laorsriae Boonyanusith, Wongkamhaeng & Athibai, 2020(Boonyanusith et al 2018, 2020. The latter is the first record of the subterranean Calanoida in Thailand.…”