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NameTchesunov, A.V. (2008). Three new species of free-living nematodes from the South-East Atlantic Abyss (DIVA I Expedition). Zootaxa. 1866 151-174.
AuthorsTchesunov, A.V.
Year2008
TitleThree new species of free-living nematodes from the South-East Atlantic Abyss (DIVA I Expedition)
JournalZootaxa
Suffix1866 151-174
Type Publication
NoteNeMys doc_id: 17862
Full textAvailable for editors  PDF available
AbstractThree 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.
Taxa
(10)
Unreviewed: has not been verified by a taxonomic editorAcantholaimus Allgén, 1933 (additional source)
Checked: verified by a taxonomic editorDesmodora inflexa Wieser, 1954 (additional source)
Unreviewed: has not been verified by a taxonomic editorMonhysteridae de Man, 1876 (additional source)
Unreviewed: has not been verified by a taxonomic editorOxystominidae Chitwood, 1935 (additional source)
Unreviewed: has not been verified by a taxonomic editorParacyatholaimus Micoletzky, 1922 (taxonomy source)
Checked: verified by a taxonomic editorParacyatholaimus intermedius (de Man, 1880) (additional source)
Checked: verified by a taxonomic editorParacyatholaimus occultus Gerlach, 1956 (additional source)
Checked: verified by a taxonomic editorParacyatholaimus pentodon Riemann, 1966 (additional source)
Checked: verified by a taxonomic editorPomponema multipapillatum Filipjev, 1922 (additional source)
Unreviewed: has not been verified by a taxonomic editorXyalidae Chitwood, 1951 (additional source)
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2014-06-18 16:05:08Z  created  Vanaverbeke, Jan
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