A new species of Tigriopus (Copepoda: Harpacticoida: Harpacticidae) from Thailand with a key to the species of the genus

Abstract

A new species of the genus Tigriopus Norman, 1869 is described from Thailand. Tigriopus sirindhornae sp. nov. resembles other species in having cyclopiform shape, nine-segmented A1 in female, A2 allobasis with three-segmented exp, male lacking an abexopodal seta, male P2 enp II with distinct outer spiniform apophysis, both baseoendopod and exp of female P5 with five setae. The new species can be distinguished by having fewer sensillae; two-segmented mandibular exp; Mx1 praecoxa more spinulose, Mx2 with spinules on three syncoxal endites, and Mxp with spinules on outer margin. Additional characters related to the female P5 and P1 and the male A1 and P2 are also helpful to distinguish this species from its congeners. An identification key for the 13 known species of Tigriopus is also provided. http://www.zoobank.org/urn:lsid:zoobank.org:pub:ABA4C14F-E484-4883-8191-F7ECECC7A3D3

Keywords:

• taxonomy
• harpacticoids
• Thailand
• key to species
• external morphology

Acknowledgements

This research is supported by the National Research Council of Thailand (NRCT) and Ramkhamhaeng University (NRCT2554A11202009). Hans-Uwe Dahms acknowledges the National Research Foundation of Korea for the support provided (NRF-2010-0025412). The authors thank Pawana Kangtia, Wongpiya Anansatitporn and Ratchadawan Jullawateelert for their assistance during preparation of this manuscript, and two anonymous reviewers for their valuable comments. Dr Frank D. Ferrari provided comments on a previous version of the manuscript.