Taxonomic review of Thoracostomopsidae (Nematoda, Enoplida): state of the art, list of valid species and dichotomous keys Author De Souza, João V. 0009-0009-4985-086X https: // orcid. org / 0009 - 0009 - 4985 - 086 X Author Maria, Tatiana F. 0000-0002-7553-2031 https: // orcid. org / 0000 - 0002 - 7553 - 2031 text Zootaxa 2023 2023-11-03 5361 4 463 496 https://www.mapress.com/zt/article/download/zootaxa.5361.4.2/52207 journal article 10.11646/zootaxa.5361.4.2 1175-5326 10152589 DAB237DC-1444-4007-BCCA-CB92CBE66617 Genus Fenestrolaimus Filipjev, 1927 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