Description of Elaphoidella brancelji sp. nov. (Crustacea, Copepoda), a New Species from a Cave in Northern Thailand


  • La-Orsri Sanoamuang Applied Taxonomic Research Center, Khon Kaen University, Khon Kaen 40002, THAILAND
  • Santi Watiroyram Division of Biology, Faculty of Science, Nakhon Phanom University, Nakhon Phanom 48000, THAILAND


Canthocamptidae, dripping water, epikarst, karstic caves, Southeast Asia


A new species of Elaphoidella Chappuis, 1929 (Copepoda, Harpacticoida) is described based on material collected from Pratummas Cave, Phitsanulok Province, Northern Thailand. Elaphoidella brancelji sp. nov. is the 13th species of Elaphoidella recorded from Thailand, and the 9th species originally described from Thailand. The new species belongs to group VIII, and is most similar to E. surinamensis (Delachaux, 1924) in the following characters: 1) anal operculum with fine (more than 25) spinules on free margin; 2) anal somite with four ventral spinules at the base of the caudal ramus; 3) first leg with three-segmented exopod and endopod; 4) first endopod of the second to the fourth legs without inner seta; 5) second endopod of the fourth leg with three elements; 6) exopod of the fifth leg in male with three setae; and 7) third endopod of the third leg in male with one apical seta. However, the new species differs from E. surinamensis in the following characters: 1) urosomites with serrated free posterior margins; 2) caudal ramus crescent-like shape, twice as long as wide at its base; 3) baseoendopod of the fifth leg in female with second inner seta longest; and 4) second endopod of the fourth leg in male with long and soft apical seta.


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How to Cite

Sanoamuang, L.-O. and Watiroyram, S. 2021. Description of Elaphoidella brancelji sp. nov. (Crustacea, Copepoda), a New Species from a Cave in Northern Thailand. Tropical Natural History. 21, 2 (Jul. 2021), 321–336.



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