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Taxonomy and biogeography of Molgolaimus Ditlevsen, 1921 (Nematoda: Chromadoria) with reference to the origins of deep sea nematodes Fonseca, G.; Vanreusel, A.; Decraemer, W. (2006). Taxonomy and biogeography of Molgolaimus Ditlevsen, 1921 (Nematoda: Chromadoria) with reference to the origins of deep sea nematodes. Antarctic Science 18(1): 23-50. https://dx.doi.org/10.1017/S0954102006000034 In: Antarctic Science. Cambridge University Press: Oxford. ISSN 0954-1020; e-ISSN 1365-2079

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Beschikbaar in	Auteurs
VLIZ: Open Marine Archive 117901 [ download pdf ]

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Trefwoorden

Biological phenomena > Evolution Biology > Organism morphology > Animal morphology Classification > Taxonomy Distribution > Geographical distribution Identification keys PSW, Weddell Sea Taxa > Species > New taxa > New species Desmodoridae Filipjev, 1922 [WoRMS]; Molgolaiminae Jensen, 1978 [WoRMS]; Molgolaimus Ditlevsen, 1921 [WoRMS] Weddell Sea [Marine Regions] Marien/Kust

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Auteurs		Top
Fonseca, G. Vanreusel, A. Decraemer, W.

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Abstract

Molgolaimus is a genus of free-living marine nematodes which is found in high densities (10–35% of the total community) up to 2000 m depth. Its occurrence is often associated with organically enriched and recently disturbed areas. Currently, only 16 species have been described, mainly from shallow waters. The present study contributes 17 new species mainly from the Weddell Sea but also from the Pacific Ocean, and provides an illustrated polytomous identification key to species level. The 33 Molgolaimus species described can be identified based on just a few morphometric features: spicule length, body length, anal body diameter, tail length and pharynx length. A first insight into the biogeography of this deep sea genus at species level is presented. A comparison of morphometric characteristics between species suggests that the most similar species co-occur in the same geographical region, rather than within the same bathymetric zones or similar ecosystems separated over long distances. These observations suggest that deep sea nematodes may not have a common origin but might have derived “recently” from shallow water taxa. Therefore, global distribution of nematodes could be explained by means of palaeogeographical events.

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