Phyllodiaptomus (Phyllodiaptomus) roietensis, a new diaptomid copepod (Copepoda, Calanoida) from temporary waters in Thailand and Cambodia, with a key to the species

Abstract

Phyllodiaptomus (Phyllodiaptomus) roietensissp. nov. was collected from temporary water bodies in Roi Et and Nakhon Ratchasima provinces in northeastern Thailand and Kampong Thom Province in central Cambodia. The new species is closely related to Phyllodiaptomus (P.) surinensis Sanoamuang & Yindee, 2001 in that it shares common morphological characters in the males: urosomites 2–3, P5 intercoxal sclerite, right P5 Exp-2, and left P5 Exp. Minor differences on the right antennule, right caudal ramus, P5 basis and Enp exist. The females differ in their Pdg 5, genital double-somite, and P5. An updated key to the species of the genus Phyllodiaptomus Kiefer, 1936 is provided.

Diversity of Freshwater Calanoid Copepods (Crustacea: Copepoda: Calanoida) in Southern Vietnam with an Updated Checklist for the Country

“…The diversity of species among the 13 genera of Diaptomidae is dominated by the genus Mongolodiaptomus, with 10 known species, followed by Tropodiaptomus and Neodiaptomus, with four species each. The numbers of species in the dominant genera in Vietnam correspond well with those reported in Thailand [8], except that Phyllodiaptomus consists of one species in Vietnam, but six species in Thailand [8,23]. However, two subterranean diaptomid species (Hadodiaptomus dumonti and Nannodiaptomus phongnhaensis) have been recorded in Vietnam [24,25], while there is no record of subterranean species in Thailand yet.…”

Diversity, Distribution, and Habitat Occurrence of the Diaptomid Copepods (Crustacea: Copepoda: Diaptomidae) in Freshwater Ecosystems of Thailand

“…Phyllodiaptomus (Phyllodiaptomus) roietensis Sanoamuang and Watiroyram, 2020 (Figure 2D) was described based on specimens from Thailand and Cambodia [21]. It is a rare species, inhabiting rice fields, roadside canals, and temporary ponds only in the northeast of Thailand.…”

“…Of the 30 calanoid species, 27 diaptomid species were reported from Southeast Asia [3]. Most of the studies were conducted in Thailand since 1994 [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22], while a few investigations have been documented in Cambodia [20,21,23], Laos [16,20,24], Malaysia [25][26][27], Singapore [28], the Philippines [29,30], and Indonesia [31]. A few studies were conducted in Vietnam [20], but most of the publications were published in Vietnamese with an English abstract [32].…”

“…Consequently, there has been a gradual increase in our knowledge of the diversity of diaptomid copepods in Thailand. Since 2001, 13 more new species have been added to the list of Thailand [10][11][12][13][14][15][16][17][18][19][20][21][22]. As part of the authors' long-term intensive collections of freshwater copepods from different habitats all over Thailand during 1993-2019 and from the literature review, an updated list of diaptomid copepods known to date for the country is presented in this contribution.…”

Geographic Variation of Phyllodiaptomus tunguidus Mitogenomes: Genetic Differentiation and Phylogeny

“…A phylogenetic tree based on mitogenomes and Cytb showed that Clade 1 is restricted to the southern Guangxi Province. In addition, two P. tunguidus populations (TB and NB) near Vietnam can be considered older, if we look at the fact that most species in Phyllodiaptomus are limited to Southeast Asia ( Dumont and Reddy, 1993 , 1994 ; Dumont et al, 1996 ; Sanoamuang and Yindee, 2001 ; Sanoamuang and Teeramaethee, 2006 ; Sanoamuang and Watiroyram, 2020 ). In contrast, Clade 2 is widely distributed in many relatively isolated basins, including the Lancnagjiang River (Yunnan Dali), Upper Pearl River (Yunnan, Kunming), Lower Pearl River (Gaozhou, Guangzhou and Shaoguan), the Minjiang River (Fujian, Fuzhou) and the Yangtze River (Hunan, Changsha; Supplementary Table S2 and Supplementary Figure S1 ).…”