TY - JOUR AU - Sanoamuang, La-Orsri AU - Watiroyram, Santi PY - 2021/07/30 Y2 - 2024/03/29 TI - Description of Elaphoidella brancelji sp. nov. (Crustacea, Copepoda), a New Species from a Cave in Northern Thailand JF - Tropical Natural History JA - Trop. Nat. His. VL - 21 IS - 2 SE - Original Articles DO - UR - https://li01.tci-thaijo.org/index.php/tnh/article/view/251714 SP - 321-336 AB - <p>A new species of <em>Elaphoidella</em> Chappuis, 1929 (Copepoda, Harpacticoida) is described based on material collected from <em>Pratummas</em> Cave, Phitsanulok Province, Northern Thailand. <em>Elaphoidella brancelji</em><strong> sp. nov.</strong> is the 13<sup>th</sup> species of <em>Elaphoidella</em> recorded from Thailand, and the 9<sup>th</sup> species originally described from Thailand. The new species belongs to group VIII, and is most similar to <em>E. surinamensis</em> (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 <em>E. surinamensis</em> 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.</p> ER -