Zoological Studies

Vol. 47 No. 3, 2008

Apocyclops ramkhamhaengi sp. nov. (Copepoda: Cyclopoida) in a  Culture Originating from Brackish Waters of Chang Island, Trat Province, Thailand

Supawadee Chullasorn1,*, Pawana Kangtia1, Khwanruan Pinkaew2, and Frank D. Ferrari3

1Department of Biology, Faculty of Science, Ramkhamhaeng University, Bangkapi, Bangkok 10240, Thailand
2Institute of Marine Science, Burapha University, Bangsaen, Chonburi Province 20131, Thailand
3IZ/MSC; MRC-534, National Museum of Natural History, Smithsonian Institution, 4210 Silver Hill Rd., Suitland, MD 20746, USA

Supawadee Chullasorn, Pawana Kangtia, Khwanruan Pinkaew, and Frank D. Ferrari (2008) A new brackish-water planktonic copepod belonging to the family Cyclopidae of the Copepoda, Apocyclops ramkhamhaengi sp. nov., is described from a culture originating off Chang I., Trat Province, Thailand.  The new species is the first record of this genus from Thailand and the 4th species of the genus from Asia.  Antenna 2 with an endopod of 2 segments separates A. ramkhamhaengi sp. nov. from A. dengizicus (Lepeshkin).  A posterolateral, rounded projection of pediger 4, and a simple line of spinules ventrally on pediger 5 separates A. ramkhamhaengi sp. nov. from A. royi (Lindberg).  A slight posterolateral projection on pediger 3 and a series of ridges dorsally on the basis of maxilla 2 are unique for A. ramkhamhaengi sp. nov., and separate it from A. borneoensis Lindberg.

Key words: Apocyclops ramkhamhaengi, New species, Thailand.

*Correspondence: E-mail:csupawadee@yahoo.com