Some new and poorly known nematode species from the Sea of Japan

Belgopeltula belgica (Vincx & Gourbault, 1992) gen. et comb. nov. and Mudwigglus micramphidium sp. nov. from the west coast of Sweden, and reappraisal of the genus Pseudaraeolaimus Chitwood, 1951 (Nematoda: Araeolaimida: Diplopeltidae)

“…The drawing shows rather cylindrical anterior part of the pharynx that rapidly widens short distance posterior to the amphideal fovea; the nerve ring is drawn immediately in front of this pharyngeal expansion, at 54% of the pharynx length. The only other known record of the same species published by Fadeeva & Mordukhovich (2013) describes the pharynx as follows: "pharynx terminates in a small bulb-like expansion". Nerve ring is not depicted in the figure but is said to encircle pharynx at 77% of its length.…”

“…Specimen from the Sea of Japan (Fadeeva & Mordukhovich 2013) is closer in size to specimens from Skagerrak (Table 1) -the only substantial differences are the length of the amphidial fovea (13.5-18.5 µm in recent specimens vs 37 µm in the male from the Sea of Japan) and less curved (weakly arcuate in recent specimens vs strongly arcuate in the male from the Sea of Japan) spicules.…”

“…Both published descriptions of Diplopeltula belgica are each based on single male specimens (Vincx & Gourbault 1992;Fadeeva & Mordukhovich 2013); females of this species were unknown until now. Recent male specimens resemble type male from the North Sea (Vincx & Gourbault 1992) in structure of amphid, digestive (see above) and excretory systems, with the exception of the following: shorter body (358-418 µm in recent specimens vs 550 µm in type male), shorter amphid (13.5-18.5 µm in recent specimens vs 26 µm in type male), shorter cephalic setae (0.5-1.5 µm in recent specimens vs 4 µm in type male), shorter (16.5-18 µm in recent specimens vs 21 µm in type male) and less curved (weakly arcuate in recent specimens vs strongly arcuate in type male) spicules.…”

“…In the original description, the nerve ring is drawn short distance behind the amphid, at 54% of the pharynx length (Vincx & Gourbault 1992). Male specimen from the Sea of Japan is described to have the nerve ring at 77% of the pharynx length (Fadeeva & Mordukhovich 2013), but it is not drawn on the figure. In recent specimens, the position of the nerve ring can not be identified with confidence, and further observations are required to clarify this.…”

Three new and five known species of Diplopeltoides Gerlach, 1962 (Nematoda, Diplopeltoididae) from Sweden, and a revision of the genus

“…The authors also described three new species (Diplopeltoides axayacatli , D. santaclarae Holovachov, Tandingan De Ley, Mundo-Ocampo, Gingold & De Ley, 2009and D. paramastigia Holovachov, Tandingan De Ley, Mundo-Ocampo, Gingold & De Ley, 2009) and transferred Diplopeltula pulchra Vincx & Gourbault, 1992 and Diplopeltula sundensis Jensen, 1978 to Diplopeltoides. Since then, one new species, Diplopeltoides holovachovi Fadeeva & Mordukhovich, 2013 was proposed by Fadeeva & Mordukhovich (2013), making a total of 11 species.…”