De Coninck Research Articles

Aspects of the Life-Cycle of Monhystera parelegantula (Nematoda; Monhysteridae)

Monhystera parelegantula (De Coninck, 1943) was collected from the sediment of the Sluice dock, a euhaline-polyhaline lagoon near the harbour of Ostend (Belgium). The species was cultivated in large numbers on a bacto-agar medium with bacterial growth. Embryonic growth was studied at 30°C and 30 %0 S. Maximum embryonic length-growth occurs at the vermiform stage. Post- embryonic length-growth, studied at 25°C and 30 %0 S, is a linear function of time and may be expressed as: 1 = 160.46 + 29.55 (Ho)' where to = time at the beginning of development; tand 1 = time (d) and length (urn). At 25 °C and 30 %0 S, average embryonic development time and generation time are 4 and 9 d respectively. Reproduction under culture conditions is parthenogenetic, but males were sometimes found. Reproduction, feeding and duration of the life cycle are discussed.

Species of Aphanolaimus (Nematoda, Araeolaimida) from Africa

Aphanolaimus louisae sp.n. from mountain lakes on Mt. Kenya is described and figured in detail. Examination by scanning electron microscopy revealed some interesting morphological characters, such as the structure of the amphideal fovea, extremely small mouth opening, cuticular striation, lateral field, cuticular pores and setae and male supplements. A. louisae most closely resembles A. aquaticus Daday, 1894, but differs in the number of preanal supplements and shape of the spicules. A specimen from Zaïre comes close to the new species and is described as Aphanolaimus sp. Finally A. microlaimus De Coninck, 1935 is redescribed on the basis of the type material.

The Cephalic Sensory System of Rotylenchus Robustus and a Comparison With Some Other Tylenchids

The cephalic sensory system of Rotylenchus robustus (De Man) consists of eighteen branches of six nerve trunks, their arrangement corresponding to De Coninck's (1942) scheme of labial symmetry. The internal labial nerves each have two ciliary terminals; they are connected with the vestibule by pores. The lateral external labial nerves, having one ciliary process, are short; the other external labial nerves shift position with the respective cephalic nerves. The amphidial nerve contains eleven ciliary processes, seven of which are enclosed within the amphidial ampulla. No papillar projections are present; the external labial and cephalic nerves have blind endings in the cuticle. The reduction of the lateral external labial nerve is thought to be correlated with the relative size of the amphid and the reduction of the lateral sectors. A comparison is made with the cephalic sensory system of Macrotrophurus arbusticola, Ditylenchus dipsaci and Radopholus similis.

Comparative morphology and descriptions of three new species of Teratocephalus from Canada

Three new species of soil-inhabiting nematodes, Teratocephalus decarinus, T. subvexus, and T. lirellus, are described. Contour and inclination of cephalic plicae, relative development of the cervical expansion, character of the body annules, number of longitudinal body ridges, and size of the metarhabdions are considered useful taxonomic characters. Morphology of the head, excretory and reproductive systems, and the cuticle is discussed and compared. All females have two uteri and bifurcated tail termini, which have not been reported previously for any known species in this genus. A taxonomic key to the nominal species is presented. T. demani Stefański, 1924 is transferred to Euteratocephalus Andrássy, 1958. T. terrestris, after De Coninck (1935), is regarded as different from T. terrestris (Bütschli, 1873) de Man, 1876 and is named T. deconincki.

Subfamily Plectinae (Nematoda) in Classifications of Goodey (1963) and De Coninck (1965); Emendation of Diagnoses of Plectoidea and Plectidae

The generic composition of the subfamily Plectinae (Orley, 1880) Micoletzky, 1922 in the classification schemes of Goodey (1963) and De Coninck (1965) is discussed in context to the definitions of higher categories given by these two authors. On the basis of the original description of Pakira Yeates, 1967, it is suggested that this genus be placed in Leptolaiminae Chitwood, 1951 under Leptolaimidae Orley, 1880 (as redefined by De Coninck in 1965). The diagnoses of Plectoidea Chitwood, 1937 and Plectidae Orley, 1880 given by De Coninck (1965) are emended to conform to the correct shape of the amphid aperture.

Studies On Mononchida of India I. the Genera Hadronchus, Iotonchus, and Miconchus and a Revised Classification of Mononchida, New Order

This is the first paper of the series on mononchs of India; it takes into account species of Hadronchus, Iotonchus, and Miconchus and it also deals with a revised classification of the group. Hadronchus andamanicus n. sp., has an apex of its dorsal tooth in posterior half of buccal cavity, mono-prodelphic gonad with a large posterior uterine sac, vulval papillae, caudal glands with terminal opening and a long filiform tail 6-10 anal body-widths long. Hadronchus shakili n. sp., is quite similar to H. andamanicus but has two ovaries. Iotonchus baqrii n. sp., is mono-prodelphic and unique in having large cuticularized pieces in the vagina at 9-12 μ from vulva. Iotonchus indicus n. sp., has two ovaries, basal dorsal-tooth, elongate-conoid tail 6-9 anal body-widths long and a subterminal opening to caudal glands. Miconchus dalhousiensis n. sp., has two ovaries, three equal sized basal teeth and tail about 4 anal body-widths long without caudal glands. Two known species, Iotonchus trichurus and Miconchus digiturus have also been recorded. A new order, Mononchida is proposed to contain the Bathyodontoidea (Clark, 1961) n. rank. and Mononchoidea (Chitwood, 1937) Clark, 1961. The superfamily Bathyodontoidea includes two families: Bathyodontidae Clark, 1961 and Mononchulidae (De Coninck, 1965) n. rank. The superfamily Mononchoidea includes the family Mononchidae Chitwood, 1937 and the following 4 new families and 2 new subfamilies: Mylonchulidae (Mylonchulinae and Sporonchulinae), Cobbonchidae, Anatonchidae and Iotonchidae.

Morphology and relationships of Periplectus labiosus n. gen., n. sp. (Nematoda:Plectinae) with remarks on its evolutionary significance

Periplectus labiosus n. gen., n. sp., a soil-inhabiting nematode from the Lake Hazen area of the Canadian Arctic, is described and illustrated. The description includes morphological details to the extent that was possible through the study of a limited number of preserved and processed specimens. The relationships of the genus are discussed with the genera Plectus Bastian, 1865, Anaplectus De Coninck and Schuurmans Stekhoven, 1933, and Pakira Yeates, 1967, with remarks on the possible evolutionary significance of the new genus.

A Review of the Genus Aulolaimus de Man, 1880 (Axonolaimidae: Aulolaiminae n. subfam.) with Notes on the Synonymy of the Genus Pandurinema Timm, 1957

Aulolaimus oxycephalus de Man, 1880 is redescribed with observations on the lectotype male and on specimens from England. The definition of the family Axonolaimidae Sch. Stek. and de Coninck, 1933 is emended to include reflexed ovaries. Aulolaiminae n.subfam. is proposed, within the Axonolaimidae, for the genera Aulolaimus de Man, 1880 and Pseudoaulolaimus Imamura, 1931. A. meyli Loof, 1961 is considered to be a species inquirenda. Pandurinema Timm, 1957, is made a synonym of Aulolaimus and further observations are made on A. filiformis (Timm, 1957) n.comb.

A Note on Negro Alienation

Previous articleNext article No AccessCommentary and DebatesA Note on Negro AlienationDaniel N. GordonDaniel N. Gordon Search for more articles by this author PDFPDF PLUS Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmail SectionsMoreDetailsFiguresReferencesCited by American Journal of Sociology Volume 70, Number 4Jan., 1965 Article DOIhttps://doi.org/10.1086/223882 Views: 5Total views on this site Citations: 6Citations are reported from Crossref PDF download Crossref reports the following articles citing this article:Julie De Coninck, Bart Du Laing Comparative Law, Behavioural Economics and Contemporary Evolutionary Functionalism, SSRN Electronic Journal (Jan 2009).https://doi.org/10.2139/ssrn.1445287Ashley E. Wroten The Erosion of the Attorney-Client Privilege in the Wake of Sarbanes Oxley and Other Conflicting Duties Facing Corporate Counsel, SSRN Electronic Journal (Jan 2009).https://doi.org/10.2139/ssrn.1703576William W. Philliber, William S. Fox Effects of socioeconomic status and perceived affluence on anomia, Sociological Spectrum 2, no.22 (Jul 2010): 123–132.https://doi.org/10.1080/02732173.1982.9981658Wen H. Kuo Immigrant/Minority Status and Alienation, Sociological Focus 11, no.44 (Oct 1978): 271–287.https://doi.org/10.1080/00380237.1978.10570324Mary Hanemann Lystad Social Alienation: A Review of Current Literature, The Sociological Quarterly 13, no.11 (Dec 2016): 90–113.https://doi.org/10.1111/j.1533-8525.1972.tb02107.xMary Hanemann Lystad Social Alienation: A Review of Current Literature, The Sociological Quarterly 13, no.11 (Dec 1971): 90–113.https://doi.org/10.1111/j.1533-8525.1971.tb01834.x

Xiphinema Basilgoodeyi N. Sp. With Observations On Its Larval Stages (Nematoda: Dorylaimina)

Xiphinema basilgoodeyi n. sp. is described and figured from specimens collected mainly about the roots of Coffea arabica L. in Congo. The description is based on one male, 36 females and 176 larvae. X. basilgoodeyi is close to but differentiated from X. index Thorne & Allen, 1950 and X. diversicaudatum (Micoletzky, 1927) Thorne, 1939 as defined by Goodey, Peacock & Pitcher (1960). Observations on the stylet formation in Xiphinema (cf. Coomans & De Coninck, 1963) and considerations on measurements and relative growth (Coomans & Bracke, 1964) are mainly based on specimens of the species described here.

Notes On the Genus Dorylaimellus Cobb, 1913 (Nemata: Dorylaimoidea), With Descriptions of Four New Species

A brief outline of the history and morphology of Dorylaimellus is given. The following nomen. clatorial changes are proposed: Dorylaimellus heterurus Schuurmans Stekhoven & Teunissen, 1938 becomes Dorylaimus heterurus (Schuurmans Stekhoven & Teunissen, 1938) new combination; Dorylaimellus multipapillatus Schuurmans Stekhoven & Teunissen, 1938 becomes a species inquirenda. Four new species are described and figured: Dorylaimellus directus n. sp. differs from D. montenegricus Andrassy, 1959 in the longer spear and longer basal expansion of the oesophagus; Dorylaimellus imitator n. sp. is closely related to D. bambesae de Coninck, 1962 and to D. andrassyi n. sp., but has small sclerotized pieces in the wall of the vagina; Dorylaimellus andrassyi n. sp. is distinguished by a ventrally arcuate tail; Dorylaimellus vexator n. sp. resembles in its general appearance the group of species D. tenuidens Thorne, 1939, D. occidentalis Thorne, 1939, D, montenegricus Andrassy, 1959 and D. directus n. sp., but has a short, relatively broad spear. A key is given to the recognized species of Dorylaimellus.

FREE-LIVING MARINE NEMATODES OF RHODE ISLAND WATERS

Description of five species of marine nematodes from coarse beach sand at Narragansett, Rhode Island, are recorded. Described and figured as new are Enoplolaimus enatus, E. regius, Synodontium narragansettense, and Bathylaimus capacosus. Bathylaimus stenolaimus Schuurmans Stekhoven and de Coninck, 1933 is described as having the six long setae in the external circle of cephalic setae segmented. A key to the species of Synodontium Cobb, 1920 is provided.