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Revision of the genus Cobbionema Filipjev, 1922 (Nematoda, Chromadorida, Selachinematidae)
Swedish Museum of Natural History, Department of Zoology.
Swedish Museum of Natural History, Department of Zoology.
Swedish Museum of Natural History, Department of Zoology.ORCID iD: 0000-0002-4285-0754
2020 (English)In: European journal of taxonomy, E-ISSN 2118-9773, Vol. 702, p. 1-34Article in journal (Refereed) Published
Abstract [en]

This paper reports on the genus Cobbionema Filipjev, 1922 in Sweden with the description of four species and a revision of the genus. Cobbionema acrocerca Filipjev, 1922 is relatively small in size, with a tail that has a conical proximal and a digitate distal section. Cobbionema cylindrolaimoides Schuurmans Stekhoven, 1950 is similar to C. acrocerca in most characters except having a larger body size and heavily cuticularized mandibles. Cobbionema brevispicula sp. nov. is characterised by short spicules and a conoid tail. Cobbionema acuminata sp. nov. is characterised by a long two-part spicule, a conical tail and three (one mid dorsal and two ventrosublateral) sharply pointed tines in the anterior chamber of the stoma that are located more anterior than in all the other species. We also present a molecular phylogeny of the family based on the nearly full-length 18S and the D2-D3 expansion segment of the 28S rRNA genes. Maximum Likelihood and Bayesian trees inferred from both genes strongly support a clade that included Cobbionema, Demonema Cobb, 1894 and Halichoanolaimus de Man, 1888 and another clade with Gammanema Cobb, 1920 and Latronema Wieser, 1954 nested together. None of the trees supported the monophyly of the subfamilies Choniolaiminae and Selachinematinae.

Place, publisher, year, edition, pages
2020. Vol. 702, p. 1-34
National Category
Zoology
Research subject
Diversity of life
Identifiers
URN: urn:nbn:se:nrm:diva-3864DOI: 10.5852/ejt.2020.702OAI: oai:DiVA.org:nrm-3864DiVA, id: diva2:1504583
Projects
Systematics of poorly known marine nematodes of the class Chromadorea from SwedenSystematics of Swedish free-living nematodes of the orders Desmodorida and Araeolaimida
Funder
The Swedish Taxonomy Initiative (ArtDatabanken, SLU)Available from: 2020-11-29 Created: 2020-11-29 Last updated: 2020-12-15Bibliographically approved

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Ahmed, MohammedBoström, SvenHolovachov, Oleksandr
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