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

La-Orsri Sanoamuang,Santi Watiroyram

doi:10.3897/zookeys.911.38496

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.

Highlights

The genus Phyllodiaptomus Kiefer, 1936, is among the most common freshwater copepods in Southeast Asia (Sanoamuang 1999)
Eleven valid species have been recorded in Asia (Walter and Boxshall 2018): Phyllodiaptomus (Phyllodiaptomus) blanci (Guerne & Richard, 1896) from Uzbekistan; P. (Ctenodiaptomus) annae (Apstein, 1907) from Sri Lanka; P. (P.) tunguidus Shen & Tai, 1964 from China; P. (P.) longipes Kiefer, 1965 from Indonesia; P. (C.) sasikumari Ranga Reddy & Venkateswarlu, 1989 and P. (C.) wellekensae Dumont & Ranga Reddy, 1993 from India; P. (C.) praedictus Dumont & Ranga Reddy, 1994, P. (P.) christineae Dumont, Ranga Reddy & Sanoamuang, 1996, P. (P.) surinensis Sanoamuang & Yindee, 2001, and P. (P.) thailandicus Sanoamuang & Teeramaethee, 2006 from Thailand; and P. (P.) irakiensis Khalaf, 2008 from Iraq
We describe Phyllodiaptomus (P.) roietensis sp. nov. from two localities in Roi Et and Nakhon Ratchasima provinces, northeast Thailand, and two localities in Kampong Thom Province in central Cambodia (Fig. 1)

Summary

Introduction

The genus Phyllodiaptomus Kiefer, 1936, is among the most common freshwater copepods in Southeast Asia (Sanoamuang 1999). (C.) sasikumari Ranga Reddy & Venkateswarlu, 1989 and P. (C.) wellekensae Dumont & Ranga Reddy, 1993 from India; P. (C.) praedictus Dumont & Ranga Reddy, 1994, P. (P.) christineae Dumont, Ranga Reddy & Sanoamuang, 1996, P. (P.) thailandicus Sanoamuang & Teeramaethee, 2006 from Thailand; and P. (C.) praedictus sulawesensis as a subspecies of P. During seasonal sampling collections of freshwater copepods from several localities in Thailand and Cambodia, we encountered another hitherto unknown species of Phyllodiaptomus. From two localities in Roi Et and Nakhon Ratchasima provinces, northeast Thailand, and two localities in Kampong Thom Province in central Cambodia (Fig. 1) We describe Phyllodiaptomus (P.) roietensis sp. nov. from two localities in Roi Et and Nakhon Ratchasima provinces, northeast Thailand, and two localities in Kampong Thom Province in central Cambodia (Fig. 1)

Materials and methods

Findings

Discussion