Onthodiplogaster japonica n. gen., n. sp. (Rhabditida: Diplogastridae) isolated from Onthophagus sp. (Coleoptera: Scarabaeidae) from Japan

A diplogastrid nematode was isolated from a dung beetle, Onthophagus sp., collected from a rotten mushroom in Kyoto, Japan. The species is characterised by its cheilostomatal shape, separated into 12 narrow plates (rugae), deep stegostom, large ellipsoidal amphids, conical female tail and characteri...

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Bibliographic Details
Published in:Scientific reports 2023-04, Vol.13 (1), p.6470-6470, Article 6470
Main Authors: Kanzaki, Natsumi, Ikeda, Yuya, Shinya, Ryoji
Format: Article
Language:English
Subjects:
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Animals
Bacteria
Coleoptera
Dimorphism
Divergence
Dung
E coli
Ecosystem
Feeding behavior
Female
Females
Food
Forest products
Fungi
Humanities and Social Sciences
Japan
Laboratories
Mononchoides
Morphology
multidisciplinary
Mushrooms
Nematodes
Neodiplogaster
New genera
Onthophagus
Ostomy
Phylogenetics
Phylogeny
Predation
Rhabditida
Scanning electron microscopy
Science
Science (multidisciplinary)
Stomata
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Description
Summary:A diplogastrid nematode was isolated from a dung beetle, Onthophagus sp., collected from a rotten mushroom in Kyoto, Japan. The species is characterised by its cheilostomatal shape, separated into 12 narrow plates (rugae), deep stegostom, large ellipsoidal amphids, conical female tail and characteristic receptaculum seminis in the female. Based on its phylogenetic status and stomatal composition, the species is typologically similar to two other diplogastrid genera, Neodiplogaster and Mononchoides . The species can be distinguished from these two genera by the size and shape of the amphid (small pore in Neodiplogaster ), female tail shape (long and filiform in Mononchoides ) and presence of receptaculum seminis (absence in the two nominal genera), and is described as a monotypic member of a new genus, Onthodiplogaster japonica n. gen., n. sp. Observation of feeding behaviour suggested that O. japonica n. gen., n. sp. does not show clear stomatal dimorphism or polymorphism, which is found in its close relatives, but the species can feed on nematodes (predation), fungi and bacteria. This monomorphic omnivory possibly represents its habitat of dung and other rotten materials, where the environment is biologically divergent, and its condition changes rapidly.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-023-33586-1