WoRMS source details
Holovachov, O. (2015). Swedish Plectida (Nematoda). Part 8. The genus Onchium Cobb, 1920. Zootaxa. 3911(4): 521-546.
196170
10.11646/zootaxa.3911.4.3 [view]
Holovachov, O.
2015
Swedish Plectida (Nematoda). Part 8. The genus <em>Onchium</em> Cobb, 1920
Zootaxa
3911(4): 521-546
Publication
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Four known and one new species of Onchium are described from bottom sediments collected in Skagerrak off the west coast of Sweden. The following known species are redescribed: Onchium ocellatum Cobb, 1920, O. metocellatum Wieser, 1956, O. parocellatum (Allge´n, 1940) and O. robustum Gerlach, 1965. Onchium longispiculum sp. n. is characterised by the 1.34–1.77 mm long body, anterior body end without cephalic capsule, anteriormost somatic sensilla located posterior to onchiostyle base, ocelli absent, excretory pore located at basis of lips, onchiostyle uniformly cylindrical, alveolar sup- plements indistinct, tubular supplements absent, spicules arcuate and 44–65 µm long. The new species has a unique set of characters (absence of developed ocelli and very long somewhat asymmetrical spicules) separating it from all other known species of the genus Onchium. The following nomenclatorial changes are proposed: O. conicaudatum (Allge´n, 1935) is considered a junior synonym of O. metocellatum; O. conicaudatum apud Wieser, 1951 is considered a synonym of O. minutum Kito, 1981. The diagnosis of the genus Onchium is emended and a tabular compendium and dichotomous iden- tification key to species of the genus Onchium are provided.
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Araeolaimus hawaiiensis Allgén, 1951 accepted as Onchium hawaiiense (Allgén, 1940) Gerlach, 1962 (taxonomy source)
Camacolaimus cobbi Allgén, 1935 accepted as Onchium ocellatum Cobb, 1920 (taxonomy source)
Camacolaimus conicaudatus Allgén, 1935 accepted as Onchium conicaudatum (Allgén, 1935) Wieser, 1956 accepted as Onchium metocellatum (Wieser, 1956) Gerlach & Riemann, 1973 (taxonomy source)
Camacolaimus ocellatus (Cobb, 1920) sensu Allgén, 1938 accepted as Onchium ocellatum Cobb, 1920 (taxonomy source)
Camacolaimus ocellatus (Cobb, 1920) sensu Allgén, 1933 accepted as Onchium ocellatum Cobb, 1920 (taxonomy source)
Camacolaimus parocellatus Allgén, 1940 accepted as Onchium parocellatum (Allgen, 1940) Gerlach, 1962 (taxonomy source)
Onchium Cobb, 1920 (taxonomy source)
Onchium longispiculum Holovachov, 2015 (original description)
Onchium metocellatum (Wieser, 1956) Gerlach & Riemann, 1973 (redescription)
Onchium minutum Kito, 1981 (taxonomy source)
Onchium ocellatum Cobb, 1920 (redescription)
Onchium parocellatum (Allgen, 1940) Gerlach, 1962 (redescription)
Onchium robustum Gerlach, 1965 (redescription)
Onchulella Cobb, 1920 accepted as Onchium Cobb, 1920 (taxonomy source)
Onchulella ocellata Cobb, 1920 accepted as Onchium metocellatum (Wieser, 1956) Gerlach & Riemann, 1973 (taxonomy source)
Camacolaimus cobbi Allgén, 1935 accepted as Onchium ocellatum Cobb, 1920 (taxonomy source)
Camacolaimus conicaudatus Allgén, 1935 accepted as Onchium conicaudatum (Allgén, 1935) Wieser, 1956 accepted as Onchium metocellatum (Wieser, 1956) Gerlach & Riemann, 1973 (taxonomy source)
Camacolaimus ocellatus (Cobb, 1920) sensu Allgén, 1938 accepted as Onchium ocellatum Cobb, 1920 (taxonomy source)
Camacolaimus ocellatus (Cobb, 1920) sensu Allgén, 1933 accepted as Onchium ocellatum Cobb, 1920 (taxonomy source)
Camacolaimus parocellatus Allgén, 1940 accepted as Onchium parocellatum (Allgen, 1940) Gerlach, 1962 (taxonomy source)
Onchium Cobb, 1920 (taxonomy source)
Onchium longispiculum Holovachov, 2015 (original description)
Onchium metocellatum (Wieser, 1956) Gerlach & Riemann, 1973 (redescription)
Onchium minutum Kito, 1981 (taxonomy source)
Onchium ocellatum Cobb, 1920 (redescription)
Onchium parocellatum (Allgen, 1940) Gerlach, 1962 (redescription)
Onchium robustum Gerlach, 1965 (redescription)
Onchulella Cobb, 1920 accepted as Onchium Cobb, 1920 (taxonomy source)
Onchulella ocellata Cobb, 1920 accepted as Onchium metocellatum (Wieser, 1956) Gerlach & Riemann, 1973 (taxonomy source)
Skagerrak for Onchium longispiculum Holovachov, 2015 (origin: native)
Skagerrak for Onchium longispiculum Holovachov, 2015 (origin: native)
Skagerrak for Onchium longispiculum Holovachov, 2015 (origin: native)
Lectotype NRM Type–8699, identified as Onchium parocellatum (Allgen, 1940) Gerlach, 1962
Holotype NRM Type–8700, geounit Skagerrak, identified as Onchium longispiculum Holovachov, 2015
Holotype NRM Type–8700, geounit Skagerrak, identified as Onchium longispiculum Holovachov, 2015
