Tylencholaimus proximus Thorne 1939
Tylencholaimus proximus Thorne, 1939 (Figs. 1 & 2) Measurements: See Table 1. Description. Female: Small sized nematodes, slightly curved ventrad upon fixation; body cylindrical, tapering gradually towards both extremities but more so towards the anterior end. Cuticle with two distinct layers, 2...
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2016
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Online Access: | https://dx.doi.org/10.5281/zenodo.6082550 https://zenodo.org/record/6082550 |
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ftdatacite:10.5281/zenodo.6082550 |
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openpolar |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
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unknown |
topic |
Biodiversity Taxonomy Animalia Nematoda Adenophorea Dorylaimida Dorylaimidae Tylencholaimus Tylencholaimus proximus |
spellingShingle |
Biodiversity Taxonomy Animalia Nematoda Adenophorea Dorylaimida Dorylaimidae Tylencholaimus Tylencholaimus proximus Ahad, Sumaya Ahmad, Wasim Tylencholaimus proximus Thorne 1939 |
topic_facet |
Biodiversity Taxonomy Animalia Nematoda Adenophorea Dorylaimida Dorylaimidae Tylencholaimus Tylencholaimus proximus |
description |
Tylencholaimus proximus Thorne, 1939 (Figs. 1 & 2) Measurements: See Table 1. Description. Female: Small sized nematodes, slightly curved ventrad upon fixation; body cylindrical, tapering gradually towards both extremities but more so towards the anterior end. Cuticle with two distinct layers, 2–3 Μm thick at midbody and 3–4 Μm on tail. Outer cuticle finely striated; inner layer thick with distinct radial refractive elements. Lateral chords occupying about 36–43 % of the midbody diameter. Lateral body pores distinct, 3–4 in the pharyngeal region, 4–5 between pharynx and vulva, and 4–5 between vulva and tail; dorsal and ventral body pores indistinct. Lip region cap-like, offset by deep constriction, 2.2–3.2 times as wide as high or about one-third to two-fifths of the body diameter at neck base; lips moderately separated and angular. Amphids cup-shaped with aperture located at the level of cephalic constriction and occupying about one-half to two-fifths of lip region diameter. Stoma a truncate cone. Odontostyle 0.6–0.8 times the lip region diameter long, its aperture about one-fourth to onethird of the odontostyle length. Odontophore rod-like, with small basal knobs, 1.1–1.6 times the odontostyle length. Guiding ring simple, refractive, at 0.5–0.6 times lip region diameter from anterior end. Pharynx consists of a slender, slightly muscular anterior part, expanding gradually into a cylindrical basal bulb, with thick-walled lumen, occupying about 34–43 % of total neck length. Pharyngeal gland nuclei and their orifices are located as follows (after Loof & Coomans 1970): DO = 62–67, DN= 65–70, S 1 N 1 = 77–80, S 1 N 2 = 84–87, S 2 N = 88–91, S 2 O = 90–92. Nerve ring located at 33–43 % of neck length from anterior region. Cardia rounded, hemispheroid, about one-third to one-half of the corresponding body diameter long. Genital system mono-prodelphic. Ovary reflexed, measuring 62–98 µm long; oocytes arranged in single row except near tip. Oviduct joining the ovary subterminally, measuring 68–98 µm, its proximal and distal parts not differentiated; oviduct-uterus junction marked by weak sphincter. Uterus short and tubular, measuring 14–35 µm. Posterior genital branch absent or reduced to a rudimentary sac, less than one-fifth to one-third of the corresponding body diameter. Vagina cylindrical; pars proximalis vaginae 4–5 µm long, its wall encircled by muscles; pars distalis vaginae short, 1.5–2.5 µm long with slightly curved walls; pars refringens absent. Vulva apparently a transverse slit. Prerectum 2.0– 3.5 and rectum 0.6 –1.0 anal body diameter long. Tail convex-conoid with bluntly rounded terminus, 1.0– 1.3 times anal body diameter long, with a pair of caudal pores on each side. Male: Not found. Table 1. Morphometrics of Tylencholaimus proximus Thorne 1939 (All measurements in µm) Habitat and localities: i). Soil around the roots of grasses (unidentified) from Saboo, Leh, Ladakh, Jammu and Kashmir, India. ii). Soil around the roots of pine ( Pinus sylvestris ) from the forest trees of Doodhpather, Budgam, Jammu and Kashmir, India. Remarks. Thorne (1939) described T. proximus from Utah, U.S.A. Coomans (1962) reported this species from Belgium. Loof (1971) redescribed it from Norway, while Thorne (1974) from U.S. A and Vinciguerra (1986) from Italy. Peña-Santiago and Coomans (1996) in their revision of the genus Tylencholaimus made a detailed study of the type population as well as five different populations comprising over one hundred female specimens of this species from Spain. The morphometrics of the present populations conform well with those of the type population except in having a shorter rectum ( vs 17.5–19 µm). The present specimens also agrees well with other earlier described populations. It also agrees fairly well with Spanish populations as well as a population from China described by Li et al . (2008). This species is reported for the first time from India. : Published as part of Ahad, Sumaya & Ahmad, Wasim, 2016, Description of two new and six known species of the genus Tylencholaimus de Man, 1876 (Nematoda: Dorylaimida) with a diagnostic compendium and key to species, pp. 451-490 in Zootaxa 4107 (4) on pages 454-456, DOI: 10.11646/zootaxa.4107.4.1, http://zenodo.org/record/267748 : {"references": ["Thorne, G. (1939) A monograph of the nematodes of the superfamily Dorylaimoidea. Capita Zoologica, 8, 1 - 261.", "Loof, P. A. A. & Coomans, A. (1970) On the develoment and location of the oesophageal gland nuclei in the Dorylaimina. Zeszyty Problemowe Postepow Nauk Rolniczych, 92, 79 - 161.", "Coomans, A. (1962) Some species of Dorylaimoidea found in Belgium. I. Members of the Tylencholaiminae Filipjev, 1934. Nematologica, 7, 146 - 154. http: // dx. doi. org / 10.1163 / 187529262 X 00882", "Loof, P. A. A. (1971) Freeliving and plant parasitic nematodes from Spitzbergen collected by Mr. H. van Rossen. Mededelingen Landbouwhogeschool Waginengen, 71, 1 - 86.", "Vinciguerra, M. T. (1986) New and known species of Tylencholaimus de Man, 1876 (Dorylaimida: Nematoda) from Italian beech forests with a key to the species. Nematologia Mediterranea, 14, 107 - 116.", "Li, Y., Baniyamuddin, M., Ahmad, W. & Wu, J. (2008) Four new and four known species of Tylencholaimoidea (Dorylaimida: Nematoda) from China. Journal of Natural History, 42, 1991 - 2010. http: // dx. doi. org / 10.1080 / 00222930802254722"]} |
format |
Text |
author |
Ahad, Sumaya Ahmad, Wasim |
author_facet |
Ahad, Sumaya Ahmad, Wasim |
author_sort |
Ahad, Sumaya |
title |
Tylencholaimus proximus Thorne 1939 |
title_short |
Tylencholaimus proximus Thorne 1939 |
title_full |
Tylencholaimus proximus Thorne 1939 |
title_fullStr |
Tylencholaimus proximus Thorne 1939 |
title_full_unstemmed |
Tylencholaimus proximus Thorne 1939 |
title_sort |
tylencholaimus proximus thorne 1939 |
publisher |
Zenodo |
publishDate |
2016 |
url |
https://dx.doi.org/10.5281/zenodo.6082550 https://zenodo.org/record/6082550 |
long_lat |
ENVELOPE(-60.700,-60.700,-62.933,-62.933) |
geographic |
Norway Thorne |
geographic_facet |
Norway Thorne |
genre |
Spitzbergen |
genre_facet |
Spitzbergen |
op_relation |
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Open Access Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode cc0-1.0 info:eu-repo/semantics/openAccess |
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https://doi.org/10.5281/zenodo.6082550 https://doi.org/10.11646/zootaxa.4107.4.1 https://doi.org/10.5281/zenodo.267749 https://doi.org/10.5281/zenodo.267750 https://doi.org/10.5281/zenodo.6082551 |
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ftdatacite:10.5281/zenodo.6082550 2023-05-15T18:27:14+02:00 Tylencholaimus proximus Thorne 1939 Ahad, Sumaya Ahmad, Wasim 2016 https://dx.doi.org/10.5281/zenodo.6082550 https://zenodo.org/record/6082550 unknown Zenodo http://zenodo.org/record/267748 http://publication.plazi.org/id/FFF3FFBCFFC5FFD71576D572FFA5FF9D http://zoobank.org/262D02B9-E5CF-429C-B0DF-D1BB42BDB604 https://zenodo.org/communities/biosyslit https://dx.doi.org/10.11646/zootaxa.4107.4.1 http://zenodo.org/record/267748 http://publication.plazi.org/id/FFF3FFBCFFC5FFD71576D572FFA5FF9D https://dx.doi.org/10.5281/zenodo.267749 https://dx.doi.org/10.5281/zenodo.267750 http://zoobank.org/262D02B9-E5CF-429C-B0DF-D1BB42BDB604 https://dx.doi.org/10.5281/zenodo.6082551 https://zenodo.org/communities/biosyslit Open Access Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode cc0-1.0 info:eu-repo/semantics/openAccess CC0 Biodiversity Taxonomy Animalia Nematoda Adenophorea Dorylaimida Dorylaimidae Tylencholaimus Tylencholaimus proximus article-journal ScholarlyArticle Taxonomic treatment Text 2016 ftdatacite https://doi.org/10.5281/zenodo.6082550 https://doi.org/10.11646/zootaxa.4107.4.1 https://doi.org/10.5281/zenodo.267749 https://doi.org/10.5281/zenodo.267750 https://doi.org/10.5281/zenodo.6082551 2022-04-01T10:22:42Z Tylencholaimus proximus Thorne, 1939 (Figs. 1 & 2) Measurements: See Table 1. Description. Female: Small sized nematodes, slightly curved ventrad upon fixation; body cylindrical, tapering gradually towards both extremities but more so towards the anterior end. Cuticle with two distinct layers, 2–3 Μm thick at midbody and 3–4 Μm on tail. Outer cuticle finely striated; inner layer thick with distinct radial refractive elements. Lateral chords occupying about 36–43 % of the midbody diameter. Lateral body pores distinct, 3–4 in the pharyngeal region, 4–5 between pharynx and vulva, and 4–5 between vulva and tail; dorsal and ventral body pores indistinct. Lip region cap-like, offset by deep constriction, 2.2–3.2 times as wide as high or about one-third to two-fifths of the body diameter at neck base; lips moderately separated and angular. Amphids cup-shaped with aperture located at the level of cephalic constriction and occupying about one-half to two-fifths of lip region diameter. Stoma a truncate cone. Odontostyle 0.6–0.8 times the lip region diameter long, its aperture about one-fourth to onethird of the odontostyle length. Odontophore rod-like, with small basal knobs, 1.1–1.6 times the odontostyle length. Guiding ring simple, refractive, at 0.5–0.6 times lip region diameter from anterior end. Pharynx consists of a slender, slightly muscular anterior part, expanding gradually into a cylindrical basal bulb, with thick-walled lumen, occupying about 34–43 % of total neck length. Pharyngeal gland nuclei and their orifices are located as follows (after Loof & Coomans 1970): DO = 62–67, DN= 65–70, S 1 N 1 = 77–80, S 1 N 2 = 84–87, S 2 N = 88–91, S 2 O = 90–92. Nerve ring located at 33–43 % of neck length from anterior region. Cardia rounded, hemispheroid, about one-third to one-half of the corresponding body diameter long. Genital system mono-prodelphic. Ovary reflexed, measuring 62–98 µm long; oocytes arranged in single row except near tip. Oviduct joining the ovary subterminally, measuring 68–98 µm, its proximal and distal parts not differentiated; oviduct-uterus junction marked by weak sphincter. Uterus short and tubular, measuring 14–35 µm. Posterior genital branch absent or reduced to a rudimentary sac, less than one-fifth to one-third of the corresponding body diameter. Vagina cylindrical; pars proximalis vaginae 4–5 µm long, its wall encircled by muscles; pars distalis vaginae short, 1.5–2.5 µm long with slightly curved walls; pars refringens absent. Vulva apparently a transverse slit. Prerectum 2.0– 3.5 and rectum 0.6 –1.0 anal body diameter long. Tail convex-conoid with bluntly rounded terminus, 1.0– 1.3 times anal body diameter long, with a pair of caudal pores on each side. Male: Not found. Table 1. Morphometrics of Tylencholaimus proximus Thorne 1939 (All measurements in µm) Habitat and localities: i). Soil around the roots of grasses (unidentified) from Saboo, Leh, Ladakh, Jammu and Kashmir, India. ii). Soil around the roots of pine ( Pinus sylvestris ) from the forest trees of Doodhpather, Budgam, Jammu and Kashmir, India. Remarks. Thorne (1939) described T. proximus from Utah, U.S.A. Coomans (1962) reported this species from Belgium. Loof (1971) redescribed it from Norway, while Thorne (1974) from U.S. A and Vinciguerra (1986) from Italy. Peña-Santiago and Coomans (1996) in their revision of the genus Tylencholaimus made a detailed study of the type population as well as five different populations comprising over one hundred female specimens of this species from Spain. The morphometrics of the present populations conform well with those of the type population except in having a shorter rectum ( vs 17.5–19 µm). The present specimens also agrees well with other earlier described populations. It also agrees fairly well with Spanish populations as well as a population from China described by Li et al . (2008). This species is reported for the first time from India. : Published as part of Ahad, Sumaya & Ahmad, Wasim, 2016, Description of two new and six known species of the genus Tylencholaimus de Man, 1876 (Nematoda: Dorylaimida) with a diagnostic compendium and key to species, pp. 451-490 in Zootaxa 4107 (4) on pages 454-456, DOI: 10.11646/zootaxa.4107.4.1, http://zenodo.org/record/267748 : {"references": ["Thorne, G. (1939) A monograph of the nematodes of the superfamily Dorylaimoidea. Capita Zoologica, 8, 1 - 261.", "Loof, P. A. A. & Coomans, A. (1970) On the develoment and location of the oesophageal gland nuclei in the Dorylaimina. Zeszyty Problemowe Postepow Nauk Rolniczych, 92, 79 - 161.", "Coomans, A. (1962) Some species of Dorylaimoidea found in Belgium. I. Members of the Tylencholaiminae Filipjev, 1934. Nematologica, 7, 146 - 154. http: // dx. doi. org / 10.1163 / 187529262 X 00882", "Loof, P. A. A. (1971) Freeliving and plant parasitic nematodes from Spitzbergen collected by Mr. H. van Rossen. Mededelingen Landbouwhogeschool Waginengen, 71, 1 - 86.", "Vinciguerra, M. T. (1986) New and known species of Tylencholaimus de Man, 1876 (Dorylaimida: Nematoda) from Italian beech forests with a key to the species. Nematologia Mediterranea, 14, 107 - 116.", "Li, Y., Baniyamuddin, M., Ahmad, W. & Wu, J. (2008) Four new and four known species of Tylencholaimoidea (Dorylaimida: Nematoda) from China. Journal of Natural History, 42, 1991 - 2010. http: // dx. doi. org / 10.1080 / 00222930802254722"]} Text Spitzbergen DataCite Metadata Store (German National Library of Science and Technology) Norway Thorne ENVELOPE(-60.700,-60.700,-62.933,-62.933) |