One new genus and two new free-living deep-sea nematode species with discussion of phylogeny of the family Leptosomatidae Filipjev, 1916

New deep-sea species of Aborjinia (Nematoda, Leptosomatidae) from the North-Western Pacific: an integrative taxonomy and phylogeny

“…Another moderately supported clade uniting Thoracostoma microlobatum and two species of genus Proplatycoma Platonova, 1976 was uncovered (BPP = 0.78). Two species of Platonova Mordukhovich et al, 2019 and Synonchus Cobb, 1894 were placed as monophyletic clade with moderate support (BPP = 0.96; ML = 98), whereas the placement of Cylicolaimus de Man, 1889 was unsupported. Thoracostoma trachygaster Hope, 1967 was sister to obtained sequences and Paraborjinia corallicola (BPP = 0.99, ML = 86) and not monophyletic to Thoracostoma microlobatum and Thoracostoma sp., rendering that genus polyphyletic.…”

Macrofauna and Nematode Abundance in the Abyssal and Hadal Zones of Interconnected Deep-Sea Ecosystems in the Kuril Basin (Sea of Okhotsk) and the Kuril-Kamchatka Trench (Pacific Ocean)

“…The main goal of these expeditions was to study the species composition and distribution patterns of bottom animals, as well as to assess the faunal relationships in the deep-sea ecosystems of the Sea of Okhotsk and the Kuril-Kamchatka Trench separated by such a natural barrier as the Kuril Islands Brandt et al, 2019). As a result, numerous species from different taxonomic groups of animals were described, the composition of macro-and meiofauna and the patterns of distribution of the main taxonomic groups of animals were studied, the faunal relationship and levels of endemism of these deep-sea areas were estimated (e.g., Maiorova, 2018, 2019;Alalykina, 2018;Brandt et al, 2018Brandt et al, , 2019Polyakova, 2018, 2019;Fukumori et al, 2018Fukumori et al, , 2019Kamenev, 2018aKamenev, ,b, 2019Kamenev, , 2020Maiorova and Adrianov, 2018a,b;Brandt, 2018, 2020;Mironov et al, 2018Mironov et al, , 2019bBorisanova and Chernyshev, 2019;Brandão et al, 2019;Mordukhovich et al, 2019;Schmidt et al, 2019;Alalykina and Polyakova, 2020;Maiorova and Adrianov, 2020;Saeedi and Brandt, 2020). However, the analysis of the quantitative distribution of macro-and meiofauna in the Kuril Basin has not been completed, and only preliminary results of the macrofauna abundance study have been reported for the Kuril-Kamchatka Trench (Lins and Brandt, 2020).…”

New genus of Ironidae (Nematoda, Enoplida) from Piip volcano (the Bering Sea)

“…The main diagnostic characters to distinguish genera of the family are presence/absence and type of metanemes, position of pharyngeal glands and cervical pore, presence/absence and type of caudal glands, position and number of male and female gonads, the presence/absence and type of anterior sensilla, the structure of pharynx, the shape of tail ( Lorenzen, 1981 ; Platonova & Mokievsky, 1994 ; Smol, Muthumbi & Sharma, 2014 ). The phylogenetic analysis of 18S rDNA and 28S rDNA revealed the monophyly of Ironidae within Enoplida ( Meldal et al, 2007 ; Bik et al, 2010 ; Mordukhovich et al, 2019 ).…”