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Helgol Mar Res (2012) 66:139151 DOI 10.1007/s10152-011-0254-3
ORIGINAL ARTICLE
A new species of Tigriopus (Copepoda, Harpacticoida, Harpacticidae) from Thailand with the descriptionof its naupliar development
Supawadee Chullasorn Viatcheslav N. Ivanenko
Hans-U Dahms Pawana Kangtia Wan-Xi Yang
Received: 11 December 2008 / Revised: 19 February 2011 / Accepted: 16 March 2011 / Published online: 5 April 2011 Springer-Verlag and AWI 2011
Abstract Both genders of Tigriopus thailandensis sp. nov. are described from a laboratory stock raised from individuals collected from the seaweed Enteromorpha clathrata in Thailand (Bangsaen Beach, Chonburi Province). Tigriopus thailandensis sp. nov. shares with its closest relative T. japonicus Mori, 1932 two setae on the third exopodal segment of leg 4 while other congeners bear 3 inner setae. However, allobasis and exopod of antenna in both genders are much more slender and elongate than inT. japonicus. All six naupliar stages of T. thailandensis are described from the offspring of isolated females. In comparison with nauplii of T. japonicus, T. thailandensis nauplii are characterized by the following: a smaller body size throughout the naupliar phase; rst antennular segment without seta, second antennular segment with only one small seta plus two longer setae; third antennular segment
with additional spinules from naupliar stage II onwards; antenna bears three small spinules on the terminal exopodal segment; one additional seta on the anterior surface of the antennary basis, tubular endopod of antenna with one tiny seta midlength at naupliar stage III that increases in size; mandibular basis with several spinules on anterior surface; mandibular coxa with one spinulose seta that is smooth inT. japonicus.
Keywords Zoosystematics Species description
External morphology Naupliar development
Larval stages Evolution Harpacticidae Thailand
AbbreviationsEnp (Exp) I First segment of endopod (exopod)14 ? Ae Example of antennular/antennary armature corresponding to 1 seta on rst and 4 setae plus 1 aesthetasc on second segmentN I and N VI Naupliar stages I and VI, respectively
Introduction
The worldwide distributed genus Tigriopus Norman, 1869, consists of 11 valid species (Wells 2007) that are characterized by their high resistance to changes in temperature, salinity, and oxygen and inhabit supralittoral rockpools (see McAllen and Block 1997; McAllen et al. 1998; McAllen 1998, 1999). Copepods of the genus Tigriopus became a focal point of several in-depth studies, e.g., its ecotoxicology reviewed by...