Syn. Trichenoplus Mawson, 1956
This genus was erected by Filipjev (1927) with the original description of three species Fenestrolaimus insulaealbae Filipjev, 1927, Fenestrolaimus murmanicus Filipjev, 1927 and Fenestrolaimus profundis Filipjev, 1927. This genus is close to Symplocostoma Bastian, 1865 and Chaetonema Filipjev, 1927, but differs by the original and most complex structure of the buccal capsule and by the presence of the cephalic capsule (Filipjev 1927). Later, Fenestrolaimus vestitus Gerlach, 1956a was described and Lorenzen (1981, 1994) synonymized Trichenoplus with Fenestrolaimus because they are similar in all aspects, renaming Trichenoplus antarcticus Mawson, 1956 to Fenestrolaimus antarcticus (Mawson, 1956) Lorenzen, 1981. Although several species were described by different authors, the entire genus is just based on females.
SPECIES INQUIRENDAE
1. Fenestrolaimus antarcticus (Mawson, 1956) Lorenzen, 1981 (Antarctica)
2. Fenestrolaimus insulaealbae Filipjev, 1927 (Russia, Kara Sea, lapsus insulae-albae)
3. Fenestrolaimus murmanicus Filipjev, 1927 (Russia, Kara Sea)
4. Fenestrolaimus profundis Filipjev, 1927 (Russia, Kara Sea)
5. Fenestrolaimus vestitus Gerlach, 1956a (France, Saint-Jean-de-Luz)
Syn. Chaetonema oxystomoides Delamare Deboutteville, Gerlach & Siewing, 1955