TY - JOUR

T1 - Two new millipede species of the genus Coxobolellus Pimvichai, Enghoff, Panha & Backeljau, 2020 (Diplopoda, Spirobolida, Pseudospirobolellidae)

AU - Pimvichai, Piyatida

AU - Enghoff, Henrik

AU - Backeljau, Thierry

PY - 2022

Y1 - 2022

N2 - Two new millipede species of the genus Coxobolellus Pimvichai, Enghoff, Panha & Backeljau, 2020 fromThailand are described: Coxobolellus saratani sp. nov. from Loei Province and Coxobolellus serratoligulatussp. nov. from Uttaradit Province. The descriptions are based on gonopod morphology and two mitochondrial gene fragments (COI and 16S rRNA). The phylogenetic mtDNA analysis assigned the twonew species unequivocally to the consistently well-supported Coxobolellus clade, in which they form afifth subclade that was well supported by maximum likelihood analysis of 16S rRNA, though neitherby Bayesian inference nor by COI. The two new Coxobolellus species share four conspicuous gonopodalsynapomorphies of the genus: (1) the protruding process on the coxae of the 3rd (and sometimes 4th) pairof male legs, (2) a large, triangular coxae on the 4th–5th pair of legs, (3) a short process of the preanal ringprotruding as far as, or slightly beyond, the anal valves, and (4) the posterior gonopod telopodite dividedinto two parts, with a conspicuous pore opening at the mesal margin at the end of the coxal part of theposterior gonopod. Thus, the two new species provide further evidence of the well-defined monophylyof the genus Coxobolellus. Finally, the paper provides an updated morphological identification key to allcurrently described Coxobolellus species.

AB - Two new millipede species of the genus Coxobolellus Pimvichai, Enghoff, Panha & Backeljau, 2020 fromThailand are described: Coxobolellus saratani sp. nov. from Loei Province and Coxobolellus serratoligulatussp. nov. from Uttaradit Province. The descriptions are based on gonopod morphology and two mitochondrial gene fragments (COI and 16S rRNA). The phylogenetic mtDNA analysis assigned the twonew species unequivocally to the consistently well-supported Coxobolellus clade, in which they form afifth subclade that was well supported by maximum likelihood analysis of 16S rRNA, though neitherby Bayesian inference nor by COI. The two new Coxobolellus species share four conspicuous gonopodalsynapomorphies of the genus: (1) the protruding process on the coxae of the 3rd (and sometimes 4th) pairof male legs, (2) a large, triangular coxae on the 4th–5th pair of legs, (3) a short process of the preanal ringprotruding as far as, or slightly beyond, the anal valves, and (4) the posterior gonopod telopodite dividedinto two parts, with a conspicuous pore opening at the mesal margin at the end of the coxal part of theposterior gonopod. Thus, the two new species provide further evidence of the well-defined monophylyof the genus Coxobolellus. Finally, the paper provides an updated morphological identification key to allcurrently described Coxobolellus species.

U2 - 10.3897/zookeys.1128.94242

DO - 10.3897/zookeys.1128.94242

M3 - Journal article

C2 - 36762239

VL - 1128

SP - 171

EP - 190

JO - ZooKeys

JF - ZooKeys

SN - 1313-2989

ER -