WoRMS source details
Miljutina, M. A.; Miljutin, D. M. (2015). A revision of the genus Paracanthonchus (Cyatholaimidae, Nematoda) with a tabular key to species and a description of P. mamubiae sp. n. from the deep North-Western Pacific. Deep Sea Research Part II: Topical Studies in Oceanography. 111: 104-118.
196195
10.1016/j.dsr2.2014.08.002 [view]
Miljutina, M. A.; Miljutin, D. M.
2015
A revision of the genus Paracanthonchus (Cyatholaimidae, Nematoda) with a tabular key to species and a description of P. mamubiae sp. n. from the deep North-Western Pacific
Deep Sea Research Part II: Topical Studies in Oceanography
111: 104-118
Publication
Available for editors [request]
The species-rich genus of marine free-living nematodes, Paracanthonchus Mikoletzky 1924(Nematoda: Cyatholaimidae), is revised. The genus numbers 72 valid species; twenty are indicated as species inquirenda because of poor descriptions and/or doubtful placement in the genus. Species of the genus were described from all oceans and latitudes. Of valid species, 64 ones(90%) were described from the tidal or uppersubtidal zones, four species were recorded from the medium or lower shelf, and three species are abyssal.
Thirty one species (43%) are known from Europe and the Northern Africa; 19 and 9 ones were described from South and North America (respectively); 8 ones were recorded from Asia; and 6 ones from the Australian region. The type species, Paracanthonchus caecus Mikoletzky 1924 has been recorded by a
number of authors from various oceans around the World, yet many of these specimens have only roughly resembled the type description. Evidently, this species represents a complex of closely related species.
Possibly, the same situation is in some other Paracanthonchus species, the repeated findings of which have no strong resemblance to type specimens. A tabular key to species is provided. A new abyssal species Paracanthonchus mamubiae from the Zenkevich Rise(North-Western Pacific, off North Japan, 5350 m depth) is described. The new species is characterized by: the tail, which is long with a thin, cylindrical terminal section; the absence of lateral differentiation of the cuticle; the presence of two groups of lateral pores (level of posterior part of pharynx and in cloacal region); one large dorsal tooth and two pairs of small subventral teeth combined with pharyngostomal cuticular ridges forming two denticles which may appear as a third pair of subventralteeth; 3–5 indistinct tubular preanal supplements; and a massive,
proximally paired gubernaculum possessing broad flattened plates on each distal end. Each flattened gubernacular plate bears numerous (50–60) small cusps and one large process.
Pacific, North West (= Warm + cold temperate (boreal))
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Paracanthonchus Micoletzky, 1924 (identification resource)
Paracanthonchus angulatus (Schuurmans Stekhoven, 1950) Wieser, 1954 (taxonomy source)
Paracanthonchus conicaudatus (Allgén, 1928) Allgén, 1929 (status source)
Paracanthonchus digitatus Gerlach, 1957 (status source)
Paracanthonchus longus Allgén, 1934 (status source)
Paracanthonchus mamubiae Miljutina & Miljutin, 2015 (original description)
Paracanthonchus angulatus (Schuurmans Stekhoven, 1950) Wieser, 1954 (taxonomy source)
Paracanthonchus conicaudatus (Allgén, 1928) Allgén, 1929 (status source)
Paracanthonchus digitatus Gerlach, 1957 (status source)
Paracanthonchus longus Allgén, 1934 (status source)
Paracanthonchus mamubiae Miljutina & Miljutin, 2015 (original description)
Brasil coast for Paracanthonchus digitatus Gerlach, 1957
Pacific Ocean for Paracanthonchus mamubiae Miljutina & Miljutin, 2015
Pacific Ocean for Paracanthonchus mamubiae Miljutina & Miljutin, 2015
Holotype SMF 17017, geounit North West Pacific, identified as Paracanthonchus mamubiae Miljutina & Miljutin, 2015