Taxonomy and biogeography of Molgolaimus Ditlevsen, 1921 (Nematoda: Chromadoria) with reference to the origins of deep sea nematodes

  title={Taxonomy and biogeography of Molgolaimus Ditlevsen, 1921 (Nematoda: Chromadoria) with reference to the origins of deep sea nematodes},
  author={Gustavo Fonseca and Ann Vanreusel and Wilfrieda Decraemer},
  journal={Antarctic Science},
  pages={23 - 50}
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… 

Cosmopolitanism and Biogeography of the Genus Manganonema (Nematoda: Monhysterida) in the Deep Sea

The analysis of the distribution of the genus Manganonema indicates the presence of large differences in dispersal strategies among different species, ranging from locally endemic to cosmopolitan, and indicates that this genus is a cosmopolitan genus, inhabiting a variety of deep-sea habitats and oceans.

Taxonomy and species distribution of the genus Manganonema Bussau, 1993 (Nematoda: Monhysterida)

The present study deals with a revision of the genus Manganonema based upon known species and nine new species, where only 5 were named due to the lack of males, suggesting a high degree of endemism of species within the genus.

Species richness of the genus Molgolaimus (Nematoda) from local- to ocean-scale along continental slopes

The evidence suggests that the study area in WIO has more widespread species and was better sampled, while the SO has many restricted species and it is most probably characterized by different biogeographical provinces.

New nematode species from the continental slope of New Zealand (Chromadorea, Microlaimida, and Chromadorida), and unexpected placement of the genus Molgolaimus Ditlevsen, 1921

Congruence analysis suggests that in some cases at least, the structure of the female reproductive system is a more taxonomically informative trait for marine nematode classification than the male reproductive system or cuticle.

Species diversity and distribution within the deep-sea nematode genus Acantholaimus on the continental shelf and slope in Antarctica

The Acantholaimus communities were characterised by a high number of congeneric species and the presence of many rare species, similar to typical deep-sea communities.

State of the art of the free-living marine Monhysteridae (Nematoda)

This study proposes to transfer eight species of the genus Thalassomonhystera to the genus Monhystrella, to show the most important diagnostic characters to identify each genus and provide taxonomic tools for species identification.

Disentangling taxonomy within the Rhabditis (Pellioditis) marina (Nematoda, Rhabditidae) species complex using molecular and morhological tools

This study indisputably demonstrates that Rhabditis (P) marina and R. (l?) mediterranea belong to a huge species complex and that biodiversity in free-living marine nematodes may be seriously underestimated.

Free-living nematodes from the deep-sea Håkon Mosby Mud Volcano, including the description of two new and three known species

Two new and three known species of the genera Aponema Jensen, 1978, Molgolaimus Ditlevsen, 1921, Sabatieria Rouville, 1903, and Terschellingia De Mann, 1888 were found at the deep-sea Hakon Mosby Mud

The biodiversity and biogeography of the free-living nematode genera Desmodora and Desmodorella (family Desmodoridae) at both sides of the Scotia Arc

The distribution patterns of the various Desmodora and Desmodorella species suggest the Scotia Arc as a shallow bridge and a possible exchange route for meiofauna between the Antarctic and South America, especially since these species seem to be constrained by water depth.



Four new nematode species, abundant in the deep-sea benthos of the Norwegian sea

Four new nematode species are described, characterized by a slender oesophageal region and a small body length, and by a weakly sclerotized cap surrounding the spicules.

New species of Metepsilonema (Nemata, Epsilonematidae) from the Channel and the Mediterranean Sea with a polytomous key for the identification of species of the genus

Four new species of Metepsilonema are described from sublittoral stations from the Channel and are mainly characterized by the large body size for the genus up to 460 μm, well overlapping annuli and wide multispiral amphids.

Biodiversity of nematode assemblages from deep-sea sediments of the Atacama Slope and Trench ( South Pacific Ocean )

Nematode assemblages were investigated (in terms of size spectra, sex ratio, Shannon diversity, trophic structure and diversity, rarefaction statistics, maturity index, taxonomic diversity and

Free-living marine nematodes from hydrothermal sediments: similarities with communities from diverse reduced habitats

The absence of a planktonic life stage makes it more difficult for nematode species to migrate between isolated hydrothermal patches, and the size spectra of the vent communities was shifted towards larger nematodes, and species diversity was much lower in the hydroThermal area.

Why are there so many species in deep-sea sediments?

Biodiversity of nematode assemblages from the region of the Clarion-Clipperton Fracture Zone, an area of commercial mining interest

The estimated regional diversity of the CCFZ is a tractable figure for biomonitoring of commercial activities in this region using marine nematodes, despite the immature taxonomy of the group.

Paleobiogeography of Mesozoic brachiopod faunas from Andean–Patagonian areas in a global context

Bathymetric patterns of body size: implications for deep-sea biodiversity