Dichelyne trionyxi sp.nov. and Dichelyne wallagoni sp.nov., two new species of the family Cucullanidae Cobbold, 1864
TL;DR: The genus Dichelyne was regarded by Yorke & Maplestone (1926) as being synonymous with the genus Cucullanus, but was later re-instated as a distinct genus by J. F. Mueller (1934), who reduced the genus Dacnitoides Ward & Magath, 1916, to synonymy with D Michelyne.
Abstract: When specimens of the turtle, Trionyx gangeticus, and of the fish, Wallago attu, were purchased in a local market and examined, nematodes were found in the intestines of both these hosts. Two males were found in the intestine of the turtle, and a male and three females in the intestine of the fish. Examination of these nematodes showed that they all belonged to the genus Dichelyne Jagerskiold, 1902, but that none of them belonged to any known species of this genus. The genus Dichelyne was regarded by Yorke & Maplestone (1926) as being synonymous with the genus Cucullanus, O. F. Mueller, 1777, but was later re-instated as a distinct genus by J. F. Mueller (1934), who reduced the genus Dacnitoides Ward & Magath, 1916, to synonymy with Dichelyne. In the light of these emendations the genus Dichelyne now includes the following species: D. fossor Jagerskiold, 1902, 1909; D. cotylophora (Ward & Magath, 1916), J. F. Mueller, 1934; D. robusta Van Cleave & Mueller, 1932; D. fastigatus Chandler, 1937; and D. diplocaecum Chandler, 1937.
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TL;DR: A new cucullanid, Dichelyne (Cucullanellus) romani n.
Abstract: A new cucullanid, Dichelyne (Cucullanellus) romani n. sp. (Nematoda: Cucullanidae), is described from the digestive tract of two notacanthid fishes, Notacanthus chemnitzii Bloch and N. bonaparte Risso (Notacanthiformes: Notacanthidae), from the Northeast Atlantic and Western Mediterranean. The presence of a precloacal sucker and ten pairs of caudal papillae in males allocates it to the subgenus Cucullanellus Tornquist, 1931. The new species differs from other members of this subgenus in its larger body size, smaller spicule/body length ratio, the distribution of caudal papillae, and the position of deirids and excretory pore. Both notacanthid fishes act as definitive hosts with slightly larger nematode specimens detected in N. chemnitzii. A wide intraspecific variability was found in the distribution of caudal papillae, and in some specimens the position of deirids, excretory pore and length of intestinal caecum also varied. A complete list of all assigned species of the subgenus Cucullanellus is presented and discussed as there are several uncertainties regarding the validity and synonymy of some species. This is the first species of Dichelyne Jagerskiold, 1902 in a notacanthid fish and one of the only two records in deep-sea fish species.
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TL;DR: During a helminthological examination of marine fishes from south of the Minnan-Taiwan Bank Fishing Ground, Taiwan Strait, Fujian, China, a new cucullanid nematode, Dichelyne (Cucullanellus) jialaris n.
Abstract: During a helminthological examination of marine fishes from south of the Minnan-Taiwan Bank Fishing Ground, Taiwan Strait, Fujian, China, a new cucullanid nematode, Dichelyne (Cucullanellus) jialaris n. sp., was removed from the intestine of the red seabream, Pagrus major (Temminck & Schlegel, 1834). The new species differs from its congeners mainly in the following characters: body size medium but with relative long spicules of 1.01 mm (0.97–1.06) in length or 20.0% (18.21– 21.8%) of the body length; proximal end of spicules somewhat expanded and distal end rounded; gubernaculum I-shaped, slightly narrow in the middle part, both ends rounded; both anterior and posterior cloaca lips round or oval, prominent and unequal in size. The anterior cloaca lip is at least 2 times larger than the posterior one. There is a conspicuous papilliform structure within the central of anterior and posterior cloacal lip. Vulva of female is not prominent, slightly postequatorial; distance from vulva to anterior end of body i...
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Cites background from "Dichelyne trionyxi sp.nov. and Dich..."
...…(Chakravarty & Majumdar, 1961) is readily distinguished from the new congener by having an enlarged, knoblike head, a very short spike on the tail end of the male, and 15 pairs of caudal papillae, of which 2 pairs are situated anterior to the preanal sucker (Chakravarty and Majumdar, 1961)....
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...Dichelyne (Cucullanellus) wallagoni (Chakravarty & Majumdar, 1961) is readily distinguished from the new congener by having an enlarged, knoblike head, a very short spike on the tail end of the male, and 15 pairs of caudal papillae, of which 2 pairs are situated anterior to the preanal sucker…...
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TL;DR: Y Yorke and Maplestone's book is actually a boiled-down library and museum combined, and makes possible an enormous amount of work in the far corners of the World which otherwise could not have been attempted, and will be the means of saving countless hours of tedious work for every investigator who interests himself in any phase of the study of nematodes which Evolves determination of genera.
Abstract: The study of parasitic nematodes has proceeded at an extremely rapid rate in recent years, and it has become increasingly difficult for investigators, particularly those who are interested in systematic phases of the subject (and every parasitologist is and must be to a greater or less extent), to keep abreast of the current literature. What constituted single genera fifty years ago, with no more species than one could count ?n his fingers, may now be split into as many genera ^ there were formerly species, and the number of described species has increased many fold. As Dr. Stiles Points out in his foreword, the present tendency is to seek knowledge for the sake of the good it will do rather than for the sake of knowledge itself, and it is because ?f this changed viewpoint that nematology has so Sreatly expanded. Except in a few of the largest library centres of the world, only a fraction of the hterature is ever available, and the worker who is far Removed from these centres is greatly restricted in his field and hopelessly handicapped in much research which he might otherwise profitably pursue. Yorke and Maplestone's book is actually a boiled-down library and museum combined, and makes possible an enormous amount of work in the far corners of the World which otherwise could not have been attempted, and it will be the means of saving countless hours of tedious work for every investigator who interests himself in any phase of the study of nematodes which Evolves determination of genera. The book makes it Possible for anyone with a knowldge of nematode Morphology to place correctly any species of nematode which he may come upon in its proper genus, if it belong to any genus described up to the middle of 1925. The book contains clear and carefully worked out keys to all the superfamilies, families, and genera of Parasitic nematodes, the best available description of the genera, the name and synonyms of the type species, and a list of such species as can, with a reasonable degree of certainty, be ascribed to each genus. Of Iriestimable value are the drawings which illustrate the essential characteristics of each genus. In most cases these are drawings of the type species, but in a few
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