scholarly journals Predictability of marine nematode biodiversity

2009 ◽  
Vol 220 (11) ◽  
pp. 1449-1458 ◽  
Author(s):  
Bea Merckx ◽  
Peter Goethals ◽  
Maaike Steyaert ◽  
Ann Vanreusel ◽  
Magda Vincx ◽  
...  
Keyword(s):  
Marine Nematode ◽  
Nematode Biodiversity

Perspiria boucheri sp. nov. (Nematoda, Desmodorida) from the East China Sea

Zootaxa ◽  
2019 ◽  
Vol 4695 (2) ◽  
pp. 195-200
Author(s):  
JING SUN ◽  
HONGXIU ZHAI ◽  
YONG HUANG
Keyword(s):  
New Species ◽  
East China Sea ◽  
Buccal Cavity ◽  
Nematode Species ◽  
East China ◽  
Similar Species ◽  
Marine Nematode ◽  
The East China Sea ◽  
Free Living ◽  
China Sea

A new free-living marine nematode species from marine sediments in the East China Sea, is described here as Perspiria boucheri sp. nov. The new species is characterized by amphideal fovea surrounded partially by body annulations; four cephalic setae stout; conical buccal cavity with a minute dorsal tooth and two ventrosublateral teeth; pharynx with a pyriform terminal bulb; tail elongated, conical with 3/4 posterior cylindrical portion which having distinct coarse annulations; spicules strongly curved with narrow ventral velum, handle-shaped proximally; gubernaculum canoe-shaped, without apophysis. The new species differs from the most similar species Perspiria striaticaudata (Timm, 1962) by strongly curved spicules with handle-shaped proximal end, gubernaculum without dorsal apophysis and relatively shorter tail. Updated key to all species of Perspiria is provided. 

scholarly journals Free-Living Marine Nematode Communities in San Jorge Gulf, Argentina

Oceanography ◽  
2018 ◽  
Vol 31 (4) ◽  
pp. 113-121
Author(s):  
Catalina Pastor de Ward ◽  
Virginia Lo Russo ◽  
Martin Varisco
Keyword(s):  
Marine Nematode ◽  
Free Living ◽  
Nematode Communities

A new species of free-living marine nematode, Diplolaimella ariakensis n. sp. (Nematoda: Monhysteridae) from the Ariake Sea, Japan

Nematology ◽  
2021 ◽  
pp. 1-11
Author(s):  
Daisuke Shimada ◽  
Toshiki Komiya ◽  
Toyoshi Yoshiga
Keyword(s):  
New Species ◽  
Buccal Cavity ◽  
Marine Nematode ◽  
Ariake Sea ◽  
Free Living ◽  
Long Tail ◽  
Dichotomous Key ◽  
Anterior Position ◽  
Close Relationship ◽  
A New Species

Summary A new species of free-living marine nematode, Diplolaimella ariakensis n. sp., is described from a muddy tidal flat of the Ariake Sea, southern Japan. Diplolaimella ariakensis n. sp. differs from its congeners by the following: presence of ocelli, absence of denticles in the buccal cavity, a long tail (11-14 cloacal body diam., c = 3.2-4.0 in male, 17-21 anal body diam., c = 2.9-3.4 in female), spicules as long as 1.4-1.8 cloacal body diam., gubernaculum 0.4-0.5 cloacal body diam. long with a dorsocaudal apophysis 0.5-0.7 cloacal body diam. long, presence of a precloacal supplement, absence of postcloacal papillae, presence of seven pairs of body pores in male, and the anterior position of the vulva (V = 43-46). A dichotomous key to Diplolaimella species is provided. Almost full-length 18S rRNA and partial cytochrome c oxidase subunit I gene sequences were determined for D. ariakensis n. sp. A maximum likelihood tree of 18S sequences supported a close relationship between D. ariakensis n. sp. and D. dievengatensis.

Taxonomy and molecular phylogeny of Arthrobotrys mangrovispora, a new marine nematode-trapping fungal species

2008 ◽  
Vol 51 (4) ◽  
Author(s):  
Aung Swe ◽  
Rajesh Jeewon ◽  
Stephen B. Pointing ◽  
Kevin D. Hyde
Keyword(s):  
Molecular Phylogeny ◽  
Fungal Species ◽  
Marine Nematode

Cell lineage in marine nematode Enoplus brevis

Development ◽  
1998 ◽  
Vol 125 (1) ◽  
pp. 143-150
Author(s):  
D.A. Voronov ◽  
Y.V. Panchin
Keyword(s):  
Fluorescent Dyes ◽  
Cell Lineage ◽  
Cell Types ◽  
Ventral Side ◽  
Marine Nematode ◽  
Cell Stage ◽  
Cell Embryo ◽  
Multiple Cell ◽  
Nerve Muscle ◽  
Nematode Development

Early cleavages of the marine nematode Enoplus brevis are symmetrical and occur in synchrony. At the 2- to 16-cell stages, blastomeres are indistinguishable. The progeny of blastomeres was investigated by intracellular injections of fluorescent dyes and horse radish peroxidase. One blastomere of the 2-cell embryo gives rise to a compact group of cells occupying about half of an embryo. The border between labeled and unlabeled cells differs in each embryo dividing it to anterior-posterior, left-right or intermediate parts. At the 8-cell stage, one blastomere gives rise to only endoderm, whereas the other blastomeres produce progeny that form multiple cell types, including nerve, muscle and hypoderm cells, in various proportions. Thus the fates of the blastomeres of early E. brevis embryos, with the exception of the endoderm precursor, are not determined. The process of gastrulation in E. brevis is very similar to that in Caenorhabditis elegans and other nematodes. At the beginning of gastrulation, the 2-celled endoderm precursor lies on the surface of embryo and then sinks inwards. After labeling of cells on the ventral side (near endoderm precursor) at the beginning of gastrulation, their progeny differentiate predominantly into body muscles or pharyngeal cells of the first stage larva. Cells that are located more laterally give rise mainly to neurons. The dorsal blastomeres differentiated principally into hypoderm cells. Our study suggests that a precise cell lineage is not a necessary attribute of nematode development.

scholarly journals Impairment of microbial and meiofaunal ecosystem functions linked to algal forest loss

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Silvia Bianchelli ◽  
Roberto Danovaro
Keyword(s):  
Habitat Loss ◽  
Ecosystem Functioning ◽  
Negative Impact ◽  
Ecosystem Functions ◽  
Marine Biodiversity ◽  
Forest Loss ◽  
Higher Taxa ◽  
Vulnerable Habitats ◽  
Nematode Biodiversity ◽  
Barren Grounds

AbstractHabitat loss is jeopardizing marine biodiversity. In the Mediterranean Sea, the algal forests of Cystoseira spp. form one of the most complex, productive and vulnerable shallow-water habitats. These forests are rapidly regressing with negative impact on the associated biodiversity, and potential consequences in terms of ecosystem functioning. Here, by comparing healthy Cystoseira forests and barren grounds (i.e., habitats where the macroalgal forests disappeared), we assessed the effects of habitat loss on meiofaunal and nematode biodiversity, and on some ecosystem functions (here measured in terms of prokaryotic and meiofaunal biomass). Overall, our results suggest that the loss of Cystoseira forests and the consequent barren formation is associated with the loss of meiofaunal higher taxa and a decrease of nematode biodiversity, leading to the collapse of the microbial and meiofaunal variables of ecosystem functions. We conclude that, given the very limited resilience of these ecosystems, active restoration of these vulnerable habitats is needed, in order to recover their biodiversity, ecosystem functions and associated services.

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