Sanoamuang Laorsri, Watiroyram Santi
Applied Taxonomic Research Center, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand.
International College, Khon Kaen University, Khon Kaen 40002, Thailand.
Zookeys. 2023 Jul 4;1168:403-424. doi: 10.3897/zookeys.1168.104636. eCollection 2023.
Phyllodiaptomus (Phyllodiaptomus) parachristineae, a new diaptomid copepod, was collected from 30 sites in the lower Mekong River Basin floodplain in northeastern Thailand and nine sites in Cambodia. The new species is the 13 species of the genus to have been recorded across Asia. It has a wide range of habitats, occurring in small to large, temporary to permanent water bodies, and it can be found at any time of the year. The morphology of the new species is most similar to that of the males of P. (P.) christineae, having a comb on the antepenultimate segment on the right antennule, symmetrical caudal rami, a narrow hyaline lamella on the left P5 basis, a distal accessory spine on the right P5Exp-2, and a single-lobed Enp on the right P5. On the other hand, the males of the new species have second and third urosomites without hair-like setae on the ventral margin, a rounded distal margin of the P5 intersclerite plate, a semi-circular lamella on the right P5 basis, a strong principal lateral spine inserted at the proximal 1/3 of the right P5Exp-2, and a two-segmented left P5Enp. Morphological differences among species in the subgenus Phyllodiaptomus (Phyllodiaptomus) as well as the distribution and habitats of the 13 species and two subspecies of in Asia are discussed.
帕拉克里斯汀叶镖水蚤（Phyllodiaptomus (Phyllodiaptomus) parachristineae），一种新的镖水蚤类桡足动物，采自泰国东北部湄公河流域下游平原的30个地点以及柬埔寨的9个地点。该新物种是亚洲已记录的该属第13个物种。它具有广泛的栖息地，出现在从小型到大型、临时性到永久性的水体中，且一年中的任何时候都能找到。新物种的形态与克里斯汀叶镖水蚤（P. (P.) christineae）的雄性最为相似，右触角倒数第三节有梳，尾叉对称，左P5基部有狭窄的透明薄片，右P5Exp - 2有远端副刺，右P5的内肢为单叶。另一方面，新物种的雄性第二和第三尾节腹缘没有毛状刚毛，P5间骨板远端边缘圆形，右P5基部有半圆形薄片，右P5Exp - 2近端1/3处插入一根强壮的主侧刺，左P5内肢分两节。本文讨论了叶镖水蚤亚属（Phyllodiaptomus (Phyllodiaptomus)）各物种间的形态差异以及该属在亚洲的13个物种和2个亚种的分布与栖息地。
