<i>Oncholaimus langhovdensis</i> sp. nov. (Nematoda: Enoplea: Oncholaimida), a New Species of Free-living Marine Nematode from Langhovde, Dronning Maud Land, East Antarctica

Abstract

A new species of free-living marine nematode, Oncholaimus langhovdensis sp. nov., is described from the intertidal zone of Langhovde (near Syowa Station), Dronning Maud Land, East Antarctica. It closely resembles 11 congeners in the conico-cylindrical tail shape present in males and amphid and excretory pore positions, short spicules, and Demanian system structure present in females. However, it mainly differs from these congeners in body size, de Man's ratios, tail length and shape, and Demanian system structure present in females. Oncholaimus langhovdensis sp. nov. also resembles four congeners known only by females, but it can be distinguished from them based on the tail length and uvette position. In addition to O. langhovdensis sp. nov., two undescribed species (Tripyloididae gen. sp. and Axonolaimidae gen. sp.) and four unidentified species (Sphaerolaimus sp., Oncholaimidae gen. sp., Comesomatidae gen. sp., and Chromadorida fam. gen. sp.) were found from the same locality.

Two New Species of Free-living Marine Nematodes (Nematoda: Axonolaimidae and Tripyloididae) from the Coast of Antarctica

“…ponticus sensu Schuurmans Stekhoven (1935) P. ponticus (Filipjev, 1922) De Coninck andSchuurmans Stekhoven, 1933 =Bathylaimus ponticus Filipjev, 1922 non P. ponticus sensu Schuurmans Stekhoven (1935) P. profundis (Filipjev, 1927) De Coninck andSchuurmans Stekhoven, 1933 =Bathylaimus profundis Filipjev, 1927 Parabathylaimus jare Shimada, Tripyloididae gen. sp. in Shimada et al (2017): table 1.…”

“…The first taxonomic result for Antarctic Continent was provided by Cobb (1914), who described 25 new species from Adelie Land. Up to the present time, more than 160 species have been described from Antarctic Continent including several deepsea sites (Cobb 1930;Steiner 1931a, b;Allgén 1946Allgén , 1959Allgén , 1960Mawson 1956Mawson , 1958Inglis 1958;Lorenzen 1973Lorenzen , 1986Hope 1974;Decraemer 1976Decraemer , 1991Allen and Noffsinger 1978;Timm 1978a, b;Platt 1983;Blome and Schrage 1985;Decraemer and Noffsinger 1992;Blome and Riemann 1999;Vermeeren et al 2004;Fonseca et al 2006;Leduc 2014Leduc , 2016Shimada et al 2017Shimada et al , 2019. Steiner (1931a, b) established 125 species and eight subspecies of Epsilonematidae based on Antarctic and Subantarctic specimens, but Lorenzen (1973) synonymized them to only three valid species.…”

“…During the 56th Japanese Antarctic Research Expedition (JARE 56), a faunal survey of the littoral meiobenthos around Syowa Station, a Japanese research station, revealed two undescribed species of free-living marine nematodes belonging to Axonolaimidae and Tripyloididae. This is the third nematode publication arising from the National Institute of Polar Research (NIPR) workshop on marine invertebrates collected during JARE operations, following Shimada et al (2017Shimada et al ( , 2019.…”

A New Free-living Marine Nematode Species of the Genus <i>Graphonema</i> (Nematoda: Chromadorida: Chromadoridae) from Antarctica

“…The description is based on specimens collected from Antarctica during the 46th Japanese Antarctic Research Expedition (JARE 46). This is the second report on marine nematode species, following the one by Shimada et al (2017). Both are outcomes of the National Institute of Polar Research (NIPR) workshops on the diversity of the Antarctic meiobenthos.…”