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Tchesunov, A. V. (2008). Three new species of free-living nematodes from the South-East Atlantic Abyss (DIVA I Expedition). Zootaxa. 1866 151-174.
181210
Tchesunov, A. V.
2008
Three new species of free-living nematodes from the South-East Atlantic Abyss (DIVA I Expedition)
Zootaxa
1866 151-174
Publication
NeMys doc_id: 17862

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Three new nematode species were found in the Angola Basin (south-east Atlantic Ocean) at depths of about 5500 m. Paracyatholaimus diva sp. nov. (Cyatholaimidae) is characterised by outer labial and cephalic setae of about 3-5 mu m, multispiral amphidial fovea with six turns in males and four turns in females situated at the level of the dorsal tooth, buccal cavity armoured with only one prominent dorsal tooth, tail consisting of anterior conical and posterior slender cylindrical half portions, and six preanal midventral setose supplementary organs. Paracyatholaimus diva sp. nov. is most similar to Paracyatholaimus rotundus Gerlach, 1964 but differs by slightly longer body (936-1176 mu m versus 705 mu m), tail shape (with clearly narrowed posterior half versus conical), six versus four supplementary organs of different shape. The genus Paracyatholaimus Micoletzky, 1923 is briefly reviewed. The genus now includes twenty-four valid species. Five species are considered as species inquirendae, mainly because of inadequate type material lacking adult stages and/or incomplete descriptions. A pictorial guide for identification of the valid species of Paracyatholaimus is provided. Pomponema proximamphidum sp. nov. shares subapical position of the amphidial fovea and distinct lateral differentiation of the somatic cuticle with five Pomponema species: P. concinnum Wieser, 1954, P. corniculata Gourbault, 1980, P. mirabile Cobb, 1917, P. multipapillatum Filipjev, 1922 and P. stomachor Wieser, 1954 but differs from them by tail length, longer posterior cylindrical portion of the tail, relative width of the amphidial fovea, position of the ventral pore and lesser number of supplementary organs. Desmodora striatocephala sp. nov. is well characterized by a combination of very large amphidial fovea occupying nearly the entire lateral surface of the cephalic capsule and thickened midventral preanal cuticle with a few supplementary papillae inserted therein in males. D. striatocephala sp. nov. differs from related species D. cuddlesae Inglis, 1963 and to some lesser degree with D. inflexa Wieser, 1954 with shorter body, relative tail length, bigger size of the amphidial fovea and lesser number of supplementary papillae.
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Acantholaimus Allgén, 1933 (additional source)
Cyatholaimus chungsani Hoeppli & Chu, 1932 accepted as Paracyatholaimus chungsani (Hoeppli & Chu, 1932) Meyl, 1954 (additional source)
Cyatholaimus dubiosus Bütschli, 1874 accepted as Paracyatholaimus dubiosus (Bütschli, 1874) Micoletzky, 1922 (additional source)
Cyatholaimus exilis Cobb, 1898 accepted as Paracyatholaimus exilis (Cobb, 1898) Micoletzky, 1924 (additional source)
Cyatholaimus proximus Bütschli, 1874 accepted as Paracyatholaimus proximus (Bütschli, 1874) Micoletzky, 1924 (additional source)
Desmodora cuddlesae Inglis, 1963 (additional source)
Desmodora inflexa Wieser, 1954 (additional source)
Desmodora striatocephala Tchesunov, 2008 (additional source)
Desmodora striatocephala Tchesunov, 2008 (original description)
Longicyatholaimus quadriseta Wieser, 1954 sensu Wieser, 1959 accepted as Paracyatholaimus pugettensis Wieser & Hopper, 1967 (additional source)
Monhysteridae de Man, 1876 (additional source)
Oxystominidae Chitwood, 1935 (additional source)
Paracanthonchus tenuispiculum Allgén, 1951 accepted as Paracyatholaimus tenuispiculum (Allgén, 1951) Wieser, 1954 (additional source)
Paracyatholaimus Micoletzky, 1922 (taxonomy source)
Paracyatholaimus arcticus Kreis, 1963 (additional source)
Paracyatholaimus botosaneanui Andrássy, 1973 (additional source)
Paracyatholaimus chilensis Gerlach, 1953 (additional source)
Paracyatholaimus chungsani (Hoeppli & Chu, 1932) Meyl, 1954 (additional source)
Paracyatholaimus diva Tchesunov, 2008 (original description)
Paracyatholaimus dubiosus (Bütschli, 1874) Micoletzky, 1922 (additional source)
Paracyatholaimus duplicatus Gerlach, 1964 (additional source)
Paracyatholaimus exilis (Cobb, 1898) Micoletzky, 1924 (additional source)
Paracyatholaimus helicellus Wieser, 1954 (additional source)
Paracyatholaimus intermedius (de Man, 1880) Micoletzky, 1922 (additional source)
Paracyatholaimus lewisi Coomans, Vincx & Decraemer, 1985 (additional source)
Paracyatholaimus occultus Gerlach, 1956 (additional source)
Paracyatholaimus oistospiculoides (Allgén, 1935) Wieser, 1954 (additional source)
Paracyatholaimus parasaveljevi Allgén, 1935 (additional source)
Paracyatholaimus paucipapillatus Gerlach, 1955 (additional source)
Paracyatholaimus pentodon Riemann, 1966 (additional source)
Paracyatholaimus pesavis Wieser & Hopper, 1967 (additional source)
Paracyatholaimus proximus (Bütschli, 1874) Micoletzky, 1924 (additional source)
Paracyatholaimus pugettensis Wieser & Hopper, 1967 (additional source)
Paracyatholaimus quadriseta (Wieser, 1954) Tchesunov, 2008 (new combination reference)
Paracyatholaimus rotundus Gerlach, 1964 (taxonomy source)
Paracyatholaimus saradi Gerlach, 1967 (additional source)
Paracyatholaimus separatus Wieser, 1954 (additional source)
Paracyatholaimus spinulosus Jensen, 1985 (additional source)
Paracyatholaimus tenuispiculum (Allgén, 1951) Wieser, 1954 (additional source)
Paracyatholaimus ternus Wieser, 1954 (additional source)
Paracyatholaimus truncatus (Cobb, 1914) Micoletzky, 1922 (additional source)
Paracyatholaimus vancouverensis Sharma & Vincx, 1982 (additional source)
Paracyatholaimus vitraeus Gerlach, 1957 (taxonomy source)
Pomponema concinnum (Wieser, 1954) Lorenzen, 1972 (taxonomy source)
Pomponema corniculata Gourbault, 1980 (additional source)
Pomponema mirabile Cobb, 1917 (additional source)
Pomponema multipapillatum (Filipjev, 1922) Wieser, 1954 (additional source)
Pomponema proximamphidum Tchesunov, 2008 (original description)
Pomponema proximamphidum Tchesunov, 2008 (additional source)
Pomponema stomachor Wieser, 1954 (additional source)
Xyalidae Chitwood, 1951 (additional source)