Pellioditis pellio (Schneider) (Nematoda: Rhabditidae) parasitizing Scaptia (Scaptia) lata (Guerin-Meneville) (Diptera: Tabanidae)

Stock, S. Patricia; Camino, Nora Beatriz

doi:10.1590/s0074-02761991000200011

Cited by 6 publications

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“…pellio in female body size: L = 1.3–2.3 mm vs. 0.79–0.90 mm, and male spicule length: 61–82 μm vs. only 21–26 μm for P . pellio [ 34 ]. The new species differs from P .…”

Section: Resultsmentioning

confidence: 99%

Morphological and Molecular Characterization of Phasmarhabditis huizhouensis sp. nov. (Nematoda: Rhabditidae), a New Rhabditid Nematode from South China

Huang

Ren

et al. 2015

PLoS ONE

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The genus Phasmarhabditis is an economically important group of rhabditid nematodes, to which the well-known slug-parasite P. hermaphrodita belongs. Despite the commercial use of Phasmarhabditis species as an attractive and promising approach for pest control, the taxonomy and systematics of this group of rhabditids are poorly understood, largely because of the lack of diagnostic morphological features and DNA sequences for distinguishing species or inferring phylogenetic relationship. During a nematode sampling effort for identifying free-living relatives of Caenorhabditis elegans in Huizhou City, Guangdong, China, a novel species belonging to the genus Phasmarhabditis was isolated from rotting leaves. Detailed morphology of the gonochoristic P. huizhouensis sp. nov. was described and illustrated. The adult female has a robust body, a relatively short and wide buccal capsule conjoined by a rhabditiform pharynx. Females are characterized by a short cupola-shaped tail end bearing a slender pointed tip, with the junction flanked by a pair of ‘rod-like’ phasmids. Males have an open peloderan bursa that is supported by 9 pairs of genital papillae and 1 terminal pair of phasmids. P. huizhouensis sp. nov. is morphologically very similar to the type species Phasmarhabditis papillosa but is distinguishable by its male caudal traits. The new species is readily differentiated from other taxa in the genus by its female tail shape. Molecular phylogenetic inferences based on small subunit (SSU) and the D2-D3 domain of large subunit (LSU) ribosomal DNA genes reveal that P. huizhouensis sp. nov. forms a unique branch in both phylogenies which is genetically related to P. hermaphrodita and other parasites such as Angiostoma spp. The host associations of P. huizhouensis sp. nov. and its ability to parasitize slugs are unknown.

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“…pellio in female body size: L = 1.3–2.3 mm vs. 0.79–0.90 mm, and male spicule length: 61–82 μm vs. only 21–26 μm for P . pellio [ 34 ]. The new species differs from P .…”

Section: Resultsmentioning

confidence: 99%

Morphological and Molecular Characterization of Phasmarhabditis huizhouensis sp. nov. (Nematoda: Rhabditidae), a New Rhabditid Nematode from South China

Huang

Ren

et al. 2015

PLoS ONE

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“…pellio (bottom row) have clearly different male tail tip morphologies and papilla arrangements. For example, the drawings by Bütschli [ 70 ] and Thorne [ 71 ] show species with leptoderan tail tips; those by Bütschli [ 70 ] and Aubertot [ 72 ] show GPs 2–3 bracketing the cloaca and those by Thorne [ 71 ] and Stock & Camino [ 73 ] show GPs 3–4 bracketing the cloaca.…”

Section: Resultsmentioning

confidence: 99%

“…pellio" (see footnote 2, p. 55, of Dougherty & Calhoun [ 78 ]). As a final example of misidentification, the alleged " Pellioditis pellio " isolated from tabanid larvae by Stock & Camino [ 73 , 79 ] is in all likelihood an Oscheius species ( Fig 9 ).…”

Section: Resultsmentioning

confidence: 99%

Pellioditis pelhamensis n. sp. (Nematoda: Rhabditidae) and Pellioditis pellio (Schneider, 1866), earthworm associates from different subclades within Pellioditis (syn. Phasmarhabditis Andrássy, 1976)

Tandingan De Ley,

Kiontke,

Bert

et al. 2023

PLoS ONE

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Recently, much attention has been focused on a group of rhabditid nematodes called Phasmarhabditis, a junior synonym of Pellioditis, as a promising source of biocontrol agents for invasive slugs. Pellioditis pelhamensis n. sp. was first isolated from earthworms near Pelham Bay Park in Bronx, New York, USA, in 1990 and has been found to be pathogenic to slugs as well as some earthworms. It has also been used in several comparative developmental studies. Here, we provide a description of this species, as well as a redescription of a similar earthworm-associated nematode, Pellioditis pellio Schneider, 1866, re-isolated from the type locality. Although P. pelhamensis n. sp. and P. pellio are morphologically similar, they are reproductively isolated. Molecular phylogenetic analysis places both species in a clade that includes all species previously described as Phasmarhabditis which are associated with gastropods. Phasmarhabditis Andrássy, 1976 is therefore a junior synonym of Pellioditis Dougherty, 1953. Also, Pellioditis bohemica Nermut’, Půža, Mekete & Mráček, 2017, described to be a facultative parasite of slugs, is found to be a junior synonym of Pellioditis pellio (Schneider, 1866), adding to evidence that P. pellio is associated with both slugs and earthworms. The earthworm-associated species P. pelhamensis n. sp. and P. pellio represent different subclades within Pellioditis, suggesting that Pellioditis species in general have a broader host range than just slugs. Because of this, caution is warranted in using these species as biological control agents until more is understood about their ecology.

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“…In contrast, the male tails from other depictions mistakenly identified as P. pellio (bottom row) have clearly different male tail tip morphologies and papilla arrangements. For example, the drawings by Bütschli [69] and Thorne [70] show species with leptoderan tail tips; those by Bütschli [69] and Aubertot [71] show GPs 2-3 bracketing the cloaca and those by Thorne [70] and Stock & Camino [72] show GPs 3-4 bracketing the cloaca.…”

Section: Life Cyclementioning

confidence: 99%

“…Because Thorne obtained his specimen from Dougherty [70], we also have to be somewhat skeptical that Dougherty & Calhoun [77] were working with P. pellio, even though Chitwood identified their culture as "R. pellio" (see footnote 2, p. 55, of Dougherty & Calhoun [77]). As a final example of misidentification, the alleged "Pellioditis pellio" isolated from tabanid larvae by Stock & Camino [72,78] is in all likelihood an Oscheius species (see Fig 9).…”

Section: Notes On Erroneous and Plausible Records Of P Pellio In The ...mentioning

confidence: 99%

Pellioditis pelhamin. sp. (Nematoda: Rhabditidae) andPellioditis pellio(Schneider, 1866), earthworm associates from different subclades withinPellioditis(syn.PhasmarhabditisAndrássy, 1976)

Ley

Kiontke

Bert

et al. 2023

Preprint

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Recently, much attention has been focused on a group of rhabditid nematodes calledPhasmarhabditis, a junior synonym ofPellioditis, as a promising source of biocontrol agents for invasive slugs.Pellioditis pelhamin. sp. was first isolated from earthworms near Pelham Bay Park in Bronx, New York, USA, in 1990, and has been found to be pathogenic to slugs as well as some earthworms. It has also been used in several comparative developmental studies. Here, we provide a description of this species, as well as a redescription of a similar earthworm-associated nematode,Pellioditis pellioSchneider, 1866, re-isolated from the type locality. AlthoughP. pelhamin. sp. andP. pellioare morphologically similar, they are reproductively isolated. Molecular phylogenetic analysis places both species in a clade that includes all species previously described asPhasmarhabditiswhich are associated with gastropods.PhasmarhabditisAndrássy, 1976 is therefore a junior synonym ofPellioditisDougherty, 1953. Also,Phasmarhabditis bohemicaNermut', Půža, Mekete & Mráček, 2017, described to be a facultative parasite of slugs, is found to be a junior synonym ofPellioditis pellio(Schneider, 1866), adding to evidence thatP. pelliois associated with both slugs and earthworms. The earthworm-associated speciesP. pelhamin. sp. andP. pelliorepresent different subclades withinPellioditis, suggesting thatPellioditisspecies in general have a broader host range than just slugs. Because of this, caution is warranted in using these species as biological control agents until more is understood about their ecology.

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Pellioditis pellio (Schneider) (Nematoda: Rhabditidae) parasitizing Scaptia (Scaptia) lata (Guerin-Meneville) (Diptera: Tabanidae)

Abstract: Pellioditis pellio (Scheneider) (Rhabdiridae: Nematoda) was found for first time, parasitizing tabanid larvae of Scaptia (Scaptia) lata (Guerin-Meneville), along the shores of Puyehue lake in Osorno, Chile. A complementary description of this parasite is given

Cited by 6 publications

References 0 publications

Morphological and Molecular Characterization of Phasmarhabditis huizhouensis sp. nov. (Nematoda: Rhabditidae), a New Rhabditid Nematode from South China

Morphological and Molecular Characterization of Phasmarhabditis huizhouensis sp. nov. (Nematoda: Rhabditidae), a New Rhabditid Nematode from South China

Pellioditis pelhamensis n. sp. (Nematoda: Rhabditidae) and Pellioditis pellio (Schneider, 1866), earthworm associates from different subclades within Pellioditis (syn. Phasmarhabditis Andrássy, 1976)

Pellioditis pelhamin. sp. (Nematoda: Rhabditidae) andPellioditis pellio(Schneider, 1866), earthworm associates from different subclades withinPellioditis(syn.PhasmarhabditisAndrássy, 1976)

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