Rogue Sperm Indicate Sexually Antagonistic Coevolution in Nematodes

Ellis, Ronald; Schärer, Lukas

doi:10.1371/journal.pbio.1001916

Cited by 3 publications

(3 citation statements)

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“…Thus, two hypotheses can be presented: (1) the nematodes probably can display geographical parthenogenesis (Ye et al , 2018). Oscheius cyru , a new species of rhabditid, is applicable to such a reproductive method without male individuals; and (2) male deficiency may suggest a form of hermaphrodite in which too few cells in the uterus indicate the presence of hermaphrodite sperm (LaMunyon & Ward, 1998; Woodruff et al , 2010; Ellis & Schärer, 2014; Ellis & Wei, 2015; Abolafia & Peña-Santiago, 2019).…”

Section: Discussionmentioning

confidence: 99%

Description ofOscheius cyrusn. sp. (Nematoda: Rhabditidae) as new entomopathogenic nematode from Iran

et al. 2022

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A new species of the genus Oscheius, Oscheius cyrus n. sp., collected in the moist soils taken from forest heights in the north of Iran, is recorded. A comprehensive description, comprising molecular (internal transcribed spacer (ITS), 18S, and 28S rDNA genes) information, morphometrics data, light microscope and scanning electron microscope images, is supplied. The species resembles Oscheius myriophilus. However, the highest ranges for female body length, female tail, infective juvenile tail length, median bulb, absence of epiptygma and lateral field incisures number vary. The new species was distinguished from Oscheius insectivorus by the general lip region. The male was not found. Molecular analysis showed that the new species has the most similarity to O. myriophilus both in the ITS and 18S regions. Morphological and molecular data confirmed its belonging to the Insectivora-group. Furthermore, the species of Ochrobactrum pseudogrignonense was reported as a dominant associated bacterium of the new Oscheius species. Finally, the mortality of the host after seven days varied from 20% to 82.5%, depending on nematodes’ concentration.

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Section: Discussionmentioning

confidence: 99%

Description ofOscheius cyrusn. sp. (Nematoda: Rhabditidae) as new entomopathogenic nematode from Iran

et al. 2022

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“…Generation of males by starvation in culture plate (Carta and Osbrink, 2005) could not be done. The presence of very small cells at uteri, which could represent hermaphrodite sperm (LaMunyon and Ward, 1998;Woodruff et al, 2010;Ellis and Schärer, 2014;Ellis and Wei, 2015), and the absence of males could indicate the evidence of hermaphroditism in this species.…”

Section: Remarksmentioning

confidence: 94%

Morphological and Molecular Characterization of Oscheius saproxylicus sp. n. (Rhabditida, Rhabditidae) From Decaying Wood in Spain, With New Insights into the Phylogeny of the Genus and a Revision of its Taxonomy

Abolafia

Peña‐Santiago

2019

Journal of Nematology

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A new species of the genus Oscheius, O. saproxylicus sp. n., collected in decaying wood obtained from an orchard in Southern Iberian Peninsula, is reported. A detailed description, including morphometrics, LM and SEM images, and molecular (18S and 28S rDNA genes) information is provided. The female is characterized by a moderately long body, lateral field with three longitudinal ridges, midbody vulva, and conical tail with acute tip. It was distinguished from its closest relative, O. dolichura, by a shorter tail and longer rectum. The male was not found. Morphological and molecular data support its belonging to Dolichura-group. Molecular analyses show that both Insectivorus and Dolichura groups are related to each other, being proposed as subgenera of the genus Oscheius as Oscheius and Dolichorhabditis. Finally, an updated taxonomy of the genus is presented, with generic and subgeneric diagnoses, list of species and a key to their identification.

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“…As a result, a simple model for how nematode sperm compete was proposed ( Figure 1A ; Ellis and Scharer, 2014 ). Inside a hermaphrodite, sperm are stored in the two structures called spermathecae and fight for positions near the maturing oocytes, where they will have the best chance of fertilization.…”

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confidence: 99%

Size isn't everything

Ellis

Wei

2015

eLife

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Rogue Sperm Indicate Sexually Antagonistic Coevolution in Nematodes

Abstract: Reproductive competition often continues long after copulation ends. This article reviews the field and introduces a new paper showing that nematode sperm can directly harm the female germ line.

Cited by 3 publications

References 37 publications

Description ofOscheius cyrusn. sp. (Nematoda: Rhabditidae) as new entomopathogenic nematode from Iran

Description ofOscheius cyrusn. sp. (Nematoda: Rhabditidae) as new entomopathogenic nematode from Iran

Morphological and Molecular Characterization of Oscheius saproxylicus sp. n. (Rhabditida, Rhabditidae) From Decaying Wood in Spain, With New Insights into the Phylogeny of the Genus and a Revision of its Taxonomy

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