Division of Biology, Faculty of Science, Nakhon Phanom University, Nakhon Phanom 48000, Thailand. .
Applied Taxonomic Research Center, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand. International College, Khon Kaen University, Khon Kaen 40002, Thailand. .
Zootaxa. 2022 May 17;5138(2):152-166. doi: 10.11646/zootaxa.5138.2.3.
A new species of harpacticoid copepod belonging to the genus Elaphoidella is described, based on materials collected from Thae Wa Phithak Cave, Lopburi Province, central Thailand. Specimens of Elaphoidella longiramus sp. nov. were found in a water bucket that was fully filled by dripping water from the cave ceiling. Of the 32 Elaphoidella species recorded from Southeast Asia, E. longiramus sp. nov. is the 14th member of this genus reported from Thailand. The new species is most similar to E. thailandensis by having four well-developed setae on the exopod of the female fifth leg. The endopod of the fourth leg is lacking, and the first leg has a two-segmented endopod in both sexes. However, it is distinguished from E. thailandensis by having elongated caudal rami, the exopod with a seta-like spinule on the inner margin of the female fifth leg, a different setal formula on the third exopod of the second to fourth legs, a different number of teeth on the anal operculum, and a different number of ventral spinules on the anal somite.
一种新的桡足类浮游动物物种属于 Elaphoidella 属，基于从泰国中部叻丕府 Thae Wa Phithak 洞穴收集的材料进行描述。Elaphoidella longiramus sp. nov. 的标本是在一个装满从洞穴天花板滴落的水的水桶中发现的。在记录的来自东南亚的 32 种 Elaphoidella 物种中，E. longiramus sp. nov. 是第 14 种来自泰国的该属物种。新种与 E. thailandensis 最为相似，其雌性第五对附肢的外肢上有四个发育良好的刚毛。第四对附肢没有内肢，第一对在两性中都有一个双节的内肢。然而，它与 E. thailandensis 不同，其尾叉肢细长，雌性第五对附肢的外肢内缘有一个刚毛状的小刺，第二至第四对附肢的第三外肢的刚毛式不同，肛瓣上的齿数不同，以及肛节上的腹面小刺数不同。
