Dataset Information

A New Species of Pristionchus (Rhabditida: Diplogastridae) and Its Bacterial Symbiont from Yixing, China.

ABSTRACT: A new nematode species, Pristionchus entomophilus n. sp., was collected during a soil sample survey in Yixing of Jiangsu province, eastern China. P. entomophilus n. sp. is distinguished by its unique characteristics. This new species is mainly hermaphroditic, with males seldom found. The new nematode has a similar body length but has much narrower body width compared with P. pacificus. Its body is covered with longitudinal ridges: 12 ridges on head, 13 or 14 ridges in the middle, 11 and 7 ridges in front and rear of the anus, respectively. The eurystomatous form mouth includes a triangular dorsal tooth, a large claw-like right subventral tooth, and a row of five ventral denticles placed opposite the dorsal tooth. Only eight pairs of genital papillae and a pair of phasmids are present in the tail of the male as the sixth pair of papillae having seemingly been degenerated and lost. Molecular phylogenetic trees based on 18S rDNA confirmed that the new species belongs to the genus Pristionchus and is most closely related to P. pacificus. Moreover, the new species was found to be occasionally associated with the entomopathogenic bacterial strain 09FLYB1 of Serratia nematodophila and be able to stably transfer the bacterial strain for several generations.

SUBMITTER: Li P

PROVIDER: S-EPMC4612189 | biostudies-literature | 2015 Sep

REPOSITORIES: biostudies-literature

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A New Species of Pristionchus (Rhabditida: Diplogastridae) and Its Bacterial Symbiont from Yixing, China.

Li Pengpeng P Dai Chensheng C Bao Haoran H Chen Long L Gao Di D Wang Guoxiang G Wang Jin J Wang Hui H Yedid Gabriel G Zhang Keyun K

Journal of nematology 20150901 3

A new nematode species, Pristionchus entomophilus n. sp., was collected during a soil sample survey in Yixing of Jiangsu province, eastern China. P. entomophilus n. sp. is distinguished by its unique characteristics. This new species is mainly hermaphroditic, with males seldom found. The new nematode has a similar body length but has much narrower body width compared with P. pacificus. Its body is covered with longitudinal ridges: 12 ridges on head, 13 or 14 ridges in the middle, 11 and 7 ridges ...[more]

PMID: 26527840

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Project description:The genus Pristionchus (Kreis, 1932) consists of more than 30 soil nematode species that are often found in association with scarab beetles. Three major radiations have resulted in the "maupasi species group" in America, the "pacificus species group" in Asia, and the "lheritieri species group," which contains species from Europe and Asia. Phylogenetic analysis indicates that a group of three species, including the gonochorists P. elegans and P. bucculentus and the hermaphrodite P. fissidentatus, is basal to the above-mentioned radiations. Two novel species are described here: Pristionchus paulseni sp. n. from Taiwan and P. yamagatae sp. n. from Japan by means of morphology, morphometrics and genome-wide transcriptome sequence analysis. Previous phylotranscriptomic analysis of the complete Pristionchus genus recognized P. paulseni sp. n. as the sister species of P. fissidentatus, and thus its importance for macro-evolutionary studies. Specifically, the gonochorist P. paulseni sp. n. and the hermaphrodite P. fissidentatus form a species pair that is the sister group to all other described Pristionchus species. P. paulseni sp. n. has two distinct mouth forms, supporting the notion that the mouth dimorphism is ancestral in the genus Pristionchus.The genus Pristionchus (Kreis, 1932) consists of more than 30 soil nematode species that are often found in association with scarab beetles. Three major radiations have resulted in the “maupasi species group” in America, the “pacificus species group” in Asia, and the “lheritieri species group,” which contains species from Europe and Asia. Phylogenetic analysis indicates that a group of three species, including the gonochorists P. elegans and P. bucculentus and the hermaphrodite P. fissidentatus, is basal to the above-mentioned radiations. Two novel species are described here: Pristionchus paulseni sp. n. from Taiwan and P. yamagatae sp. n. from Japan by means of morphology, morphometrics and genome-wide transcriptome sequence analysis. Previous phylotranscriptomic analysis of the complete Pristionchus genus recognized P. paulseni sp. n. as the sister species of P. fissidentatus, and thus its importance for macro-evolutionary studies. Specifically, the gonochorist P. paulseni sp. n. and the hermaphrodite P. fissidentatus form a species pair that is the sister group to all other described Pristionchus species. P. paulseni sp. n. has two distinct mouth forms, supporting the notion that the mouth dimorphism is ancestral in the genus Pristionchus.

Project description:The authors describe five new species of Pristionchus from Japan and Hongkong. Scarab beetle samplings in Hongkong identified P. hongkongensis sp. n. and P. neolucani sp. n., representing the first beetle-associated Pristionchus species from China. Surprisingly, samplings of millipedes in Japan revealed a previously unknown association of Pristionchus nematodes with these arthropods. Specifically, the authors found three previously known Pristionchus species, P. arcanus, P. entomophagus, and P. fukushimae on Japanese millipedes. In addition, the authors found three new Pristionchus species on millipedes, which are described as P. riukiariae sp. n., P. degawai sp. n., and P. laevicollis, sp. n., the latter of which was also found on stag beetles. These species are most closely related to P. maxplancki, P. japonicus, and P. quartusdecimus and belong to the pacificus species-complex. The authors describe all species based on morphology, morphometrics, and genome-wide sequence analysis. Mating experiments indicated that all species are reproductively isolated from each other and in contrast to the species of the "pacificus species-complex sensu stricto" they do not form F1 hybrids.The authors describe five new species of Pristionchus from Japan and Hongkong. Scarab beetle samplings in Hongkong identified P. hongkongensis sp. n. and P. neolucani sp. n., representing the first beetle-associated Pristionchus species from China. Surprisingly, samplings of millipedes in Japan revealed a previously unknown association of Pristionchus nematodes with these arthropods. Specifically, the authors found three previously known Pristionchus species, P. arcanus, P. entomophagus, and P. fukushimae on Japanese millipedes. In addition, the authors found three new Pristionchus species on millipedes, which are described as P. riukiariae sp. n., P. degawai sp. n., and P. laevicollis, sp. n., the latter of which was also found on stag beetles. These species are most closely related to P. maxplancki, P. japonicus, and P. quartusdecimus and belong to the pacificus species-complex. The authors describe all species based on morphology, morphometrics, and genome-wide sequence analysis. Mating experiments indicated that all species are reproductively isolated from each other and in contrast to the species of the “pacificus species-complex sensu stricto” they do not form F1 hybrids.

Dataset Information

A New Species of Pristionchus (Rhabditida: Diplogastridae) and Its Bacterial Symbiont from Yixing, China.

Publications

A New Species of Pristionchus (Rhabditida: Diplogastridae) and Its Bacterial Symbiont from Yixing, China.

Similar Datasets

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