tailieunhanh - A new species of the genus halicyclops from freshwater in central VietNam

A new cyclopoid species, Halicyclops songsonensis Tran, Le & Ho, sp. n., from the Son River, Quang Binh Province, Central Vietnam is described. The new species is distinguished from its other congeners by having the spine formula of 3:4:4:3 on P1-P4, lateral angular protuberances on the genital double-somite, a serrate hyaline frill of pre-anal somite slightly larger on dorsal part than that on lateral and ventral parts, relatively long caudal rami, spiniform seta of proximalmost seta on P2-P3 Enp3 and showing the round/oval integumental windows on cephalothorax and two next prosomites. | TAP CHI HOC 2016, 38(4): 449-457 A newSINH species of the genus Halicyclops DOI: A NEW SPECIES OF THE GENUS Halicyclops (Copepoda, Cyclopoida, Cyclopidae) FROM FRESHWATER IN CENTRAL VIETNAM Tran Duc Luong1*, Le Danh Minh2, Ho Thanh Hai1 1 Institute of Ecology and Biological Resources, VAST 2 Ha Tinh University ABSTRACT: A new cyclopoid species, Halicyclops songsonensis Tran, Le & Ho, sp. n., from the Son River, Quang Binh Province, Central Vietnam is described. The new species is distinguished from its other congeners by having the spine formula of 3:4:4:3 on P1-P4, lateral angular protuberances on the genital double-somite, a serrate hyaline frill of pre-anal somite slightly larger on dorsal part than that on lateral and ventral parts, relatively long caudal rami, spiniform seta of proximalmost seta on P2-P3 Enp3 and showing the round/oval integumental windows on cephalothorax and two next prosomites. Keywords: Copepods, Halicyclopinae, taxonomy, new species, freshwater. Citation: Tran Duc Luong, Le Danh Minh, Ho Thanh Hai, 2016. A new species of the genus Halicyclops (Copepoda, Cyclopoida, Cyclopidae) from freshwater in Central Vietnam. Tap chi Sinh hoc, 38(4): 449-457. DOI: . *Correspoding author: tranducluongiebr@. Received 19 December 2016, accepted 26 December 2016 INTRODUCTION Halicyclops Norman, 1903 is a cosmopolitan genus of cyclopoid copepods of the subfamily Halicyclopinae. It is widely distributed in different kinds of surface brackish water bodies, tidal pools, lagoons and estuarine waters, anchialine caves, sinkholes, interstitial and sandy beaches habitats, as well as ponds and marshes (Chang, 2012; Pesce, 2016). To date, a total of 95 species and subspecies have been known (Walter & Boxshall, 2015). Most of them are planktonic and inhabiting chiefly coastal brackish water habitats. However, only several species have been reported as exclusive freshwater forms, for example H. .