Tripylina stramenti ( Yeates, 1971 ) Tsalolikhin, 1983
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publication ID |
https://doi.org/ 10.12651/JSR.2022.11.2.098 |
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persistent identifier |
https://treatment.plazi.org/id/03EA5562-FFE7-8C46-FF48-F9479A419DAF |
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treatment provided by |
Felipe |
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scientific name |
Tripylina stramenti ( Yeates, 1971 ) Tsalolikhin, 1983 |
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Tripylina stramenti ( Yeates, 1971) Tsalolikhin, 1983 View in CoL
( Table 1, Fig. 1 View Fig )
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Trischistoma stramenti View in CoL : Yeates, 1971: 897; fig. 1. Tripylina stramenti Tsalolikhim, 1983: 212 View in CoL ; fig. 111.
Material examined. 4$$; Ulleung-eup , Ulleung-gun, Gyeongsangbuk-do, South Korea (18 June 2019) ; extracted from soil by sieving and the Baermann funnel method. Voucher specimens were deposited at the Nakdonggang National Institute of Biological Resources (slide nos. NNIBRIV74478-74481), Korea .
Measurements. See Table 1 for morphometric data.
Description. Female: Body relatively large (1,395 -1,686 μm), G-shaped upon fixation, ventrally curved. Cuti- cle smooth, 0.7-0.9 μm thick at mid-body region. Head rounded, continuous with the neck. Six inner labial sensilla, short and conical. Six long and four short cephalic setae distinct; six longer setae 15.1-16.9 μm or 54-64% of head diameter with distal end; four shorter setae 6.1- 9.1 μm or 22-34% of head diameter, slenderer than the long cephalic setae. Amphids calyciform, located at 18.4- 24.8 μm, or one head width, from the anterior end. Dorsal part of stoma wall slightly thickened; pocket-like form for teeth at mid-stoma; dorsal tooth prominent at 15.8- 18.4 μm from anterior end; two small subventral denticles anterior to dorsal tooth, 1.9-7.0 μm from dorsal tooth. Pharynx cylindroid, with slight anterior swelling. Single cervical seta present, located at 87.9-106.5 μm from anterior end. Nerve ring located at 35.6-45.7% of the pharynx length. Excretory pores inconspicuous. Pharyngeal-intes- tinal junction with three ovoid pericardial cells. Distinct intestinal wall. Reproductive system monodelphic-prodel- phic, occupying 17.9-22.1% of body length. Vulva without protuberant lips. Vagina 8.1-14.1 μm or 0.1-0.3-body diameter long. Postuterine sac absent. Laterally reflexed ovary. Rectum 0.4-1.0 times of anal body diameter in length. Tail uniformly conoid and twisted in all specimens. Caudal glands large, arranged in tandem, spinneret terminal.
Male: Not found.
Distribution. India ( Tahseen and Nusrat, 2010), New Zealand ( Yeates, 1971), South Korea (this study), and West Africa ( Andrássy, 2008).
Habitat. Soil and freshwater.
Remarks. The morphological characters and measurements of the specimens isolated from Korea are generally consistent with the original description of T. stramenti type specimen, except for the body width (a = 30.8-31.6 vs. 26.0-30.4; Yeates, 1971). The specimens differ from the West African population described by Andrássy (2008) in having a longer outer labial setae (15.1-16.9 vs. 13- 15 μm) and thinner cuticles (0.7-0.9 vs. 1.5-2.0 μm). Compared to the Indian populations, our specimens have nerve rings located anteriorly (35.6-45.7 vs. 46-50%; Tahseen and Nusrat, 2010). These morphological differ- ences between the isolates are not substantial and can be regarded as intraspecific variations due to their different geographic origins. In this study, we were not able to find male specimens and conducted species identification based on morphological characteristics examined from female individuals, similar to the observations of previ- ous studies including original description of T. stramenti ( Yeates, 1971; Andrássy, 2008; Zhao, 2009; Tahseen and Nusrat, 2010). No males indicates parthenogenic repro- duction is common in the species and in soil nematode taxonomy.
Tripylina stramenti resembles T. puxianensis Xu, Zhao, Wang and Zheng, 2013 , T. ymyensis Tahseen and Nusrat, 2010 and T. ursulae (Argo and Heyns, 1973) Tsalolikhin, 1983 . However, it is distinguished from T. puxianensis by having subventral teeth anterior to and smaller than dorsal tooth (vs. posterior position and similar size). Present cervical setae of T. stramenti distinguish it from the absence cervical setae of T. ymyensis and it differs from T. ursulae by thinner body (a = 26-36 vs 22-26).
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