The ultrastructure of the cuticle of Nematoda. I. The body cuticle within the Stilbonematinae (Adenophorea, Desmodoridae)

Urbancik, W.; Bauer-Nebelsick, Monika; Ott, J&#x000F6;rg A.

doi:10.1007/s004350050008

Cited by 6 publications

(18 citation statements)

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“…The first set passes through the radially striated layer to connect the 'median' vacuolar layer with the electron-dense fibrillar layer.The second set connects the electron-dense fibrillar layer with the epidermis and thus possibly allows the exchange of material between the epidermis and the cuticle. The radially striated layer appears to be similar to the radially striated layer in the basal zone of C. elegans dauer juveniles, IV, Rhabditida, also at the level of the ( 1) Yushin & Malakhov ( 1994 ), ( 2 ) Tchesunov et al ( 1996), (3 ) Urbancik et al (1996 ), (4 ) Yushin & Malakhov ( 1992), ( 5) Franz & Büttner ( 1983 ). TS, transverse section ; LS, longitudinal section.…”

Section: The Cuticle Structure In the Enoplea ( I-ii )mentioning

confidence: 93%

“…This interpretation of the basal zone is similar to that of Bird (1980Bird ( , 1984. Urbancik, Bauer-Nebelsick & Ott (1996) gave a different interpretation of the cortical zone, subdividing this zone into (1) an external cortical zone composed of the epicuticle and the underlying non-striated layers and (2) an internal cortical zone with transverse striae in the Desmodoridae (Chromadorida). The epicuticle is often referred to as the external cortical zone (Costa, Draper & Priess, 1997).…”

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confidence: 99%

“…The epicuticle is often referred to as the external cortical zone (Costa, Draper & Priess, 1997). The cortical zone may be described as cortex and does not include the epicuticle ( Jones, Petry & Johnston, 1993;Lee, 2002); when subdivided, the more electron-dense outer layer of the cortical zone has been described as 'outer cortex' in Lee (2002) and is different from the outer cortical zone sensu Urbancik et al (1996).…”

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confidence: 99%

“…We have not attempted to consider all published examples of nematode cuticles, because some taxa would then become grossly overrepresented, e.g. freeliving marine nematodes (Yushin & Malakhov, 1994;Tchesunov et al, 1996;Urbancik et al, 1996) and the Tylenchina (Cliff & Baldwin, 1985;Mounport, Baujard & Martiny, 1993a, c, 1997a. We included examples of the widest possible range of taxa for which comparable data are available.…”

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Review of the ultrastructure of the nematode body cuticle and its phylogenetic interpretation

et al. 2003

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The phylogenetic interpretation of the nematode cuticle ultrastructure is reviewed within the framework of recent DNA-sequence data. In particular, the structure of the median and basal zones is discussed. Several structural elements of the cuticle seem to have arisen independently several times within the Nematoda and thus are highly homoplasious (e.g. the cortical or basal radial striae, spiral fibre layers and a fluid matrix with struts). Moreover, identifying the homology of the nematode cuticle ultrastructures is often very difficult at deep taxonomic levels. Hence, the cuticle appears to be unreliable regarding resolution of deep-level relationships in the Nematoda. However, at less inclusive taxonomic levels (e.g. families, genera, ...) the cuticle seems to be a more reliable phylogenetic marker.

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Section: The Cuticle Structure In the Enoplea ( I-ii )mentioning

confidence: 93%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Review of the ultrastructure of the nematode body cuticle and its phylogenetic interpretation

et al. 2003

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“…For example, Urbancik et al (1996a) demonstrated an unexpected variability in basic construction of the cuticle between members of seven closely related genera and showed that a character of high taxonomic value, the "cephalic capsule", has a completely different origin in each of these nematodes (Urbancik et al 1996b). Furthermore, most of the EM data on nematodes have been gathered from members of the Secernentea (which comprise most parasites and soil nematodes, including Caenorhabditis elegans Maupas, 1899).…”

Section: A Introductionmentioning

confidence: 99%

Ultrastructure and reconstruction of the pharynx of Leptonemella juliae (Nematoda, Adenophorea)

Hoschitz¹,

Bright²,

Ott³

2001

Zoomorphology

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The pharynx of Leptonemella juliae is the first pharynx of Adenophorea that has been reconstructed three-dimensionally using TEM serial sections. It is composed of a slightly swollen corpus, a median narrow isthmus, and a pronounced terminal bulb. At its anterior end, the lumen of the pharynx opens into a small buccal cavity without any specific cuticular differentiation, while at the posterior end it is separated from the intestine by a pharyngeo-intestinal valve. The entire pharynx epithelium is delimited from the pharynx lumen by cuticle and from the remaining body by extracellular matrix. The main cellular components of the pharynx of L. juliae are: the radial epithelio-muscle cells and the marginal cells, two subventral and one dorsal gland cells, the nervous system, which consists of six longitudinal nerves stretching from anterior to posterior, one horseshoeshaped commissure, three nerve rings, and three pharyngeal sensory structures (PSS). The ultrastructure and location of gland cells, the sensory structure, and the nervous system appear to be character complexes of value for comparative anatomy. A detailed description of the PSS is presented.

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Screwed up: Spirality of segments and other iterated structures suggest an underlying principle of seriality in bilaterians

Scholtz

2021

Journal of Morphology

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This review deals with helicomery, that is, the specific malformation of a spiral arrangement of segments and other serial structures. Helicomery was first described in annelid and arthropod body segments. However, corresponding patterns occur in arthropod appendages and other bilaterians with serially arranged body parts, such as tapeworms, nematodes, vertebrates, and probably chitons. The specifics of the spirals such as length, orientation, and handedness are described. Most spirals are dorsal and comprise only a few loops. Helicomery is formed by a shift of cells during development or in adults caused by changes in cell adhesion or mechanical impacts such as lesions. A model for the formation of helicomery is proposed, which is based on medieval church labyrinths. These complex spiral structures are derived from concentric lines by the shift of relatively few tiles. This principle of “small causes, great effect” also applies to “spiral segments,” because helicomery dissolves segmental patterns and questions the concept of segments as distinct structures. The widespread occurrence of helicomery in nonhomologous serial structures might indirectly indicate an underlying principle of seriality among Bilateria.

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The ultrastructure of the cuticle of Nematoda. I. The body cuticle within the Stilbonematinae (Adenophorea, Desmodoridae)

Cited by 6 publications

References 0 publications

Review of the ultrastructure of the nematode body cuticle and its phylogenetic interpretation

Review of the ultrastructure of the nematode body cuticle and its phylogenetic interpretation

Ultrastructure and reconstruction of the pharynx of Leptonemella juliae (Nematoda, Adenophorea)

Screwed up: Spirality of segments and other iterated structures suggest an underlying principle of seriality in bilaterians

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