Studies on four atypical species of the genus Labronema Thorne, 1939 (Dorylaimida, Qudsianematidae)
Studies on four atypical species of the genus Labronema Thorne, 1939 (Dorylaimida, Qudsianematidae)
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对 Labronema Thorne 属四种非典型物种的研究，1939 年（Dorylaimida、Qudsianematidae）
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
R. Peña‐Santiago
中科院分区：
文献类型：
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作者：
S. Álvarez‐Ortega;T. Vu;R. Peña‐Santiago
模式材料为透明Labronema hyalinum和L. pacificum，以及L. neopacificum从越南，所有这些都有一个共同的近连续的唇区，检查，（重新）描述和说明。透明唇线虫（Labronema hyalinum）体长2.86-3.93 mm，唇区截形，宽32-34 μ m，牙柱长44-48 μ m，口占体长的38-40%，颈长747-856 μ m，咽部扩张378-422 μ m，占颈长的48-51%，周围有一个纤细的无肌鞘，子宫四分，长469-608 μ m，为相应体径的3.7-4.3倍，阴道后壁有两片，外阴纵行（V = 49-52），尾短而圆（34-36 μ m，c = 93-101，c' = 0.5-0.6），骨针长120 μ m，腹正中有31个相邻的补片。太平洋唇线虫体长2.30-2.78 mm，唇区连续，宽22 μ m，齿杆长32 μ m，开口约占其全长的一半，颈部长517-600 μ m，咽部扩张305 μ m，占颈部总长度的51%，V = 47，尾短而圆（23- 36 μ m，c = 78-100，c' = 0.4-0.6），骨针长82 μ m，腹正中补片16-22个。新的数据，包括SEM观察，提供了L。新太平洋Thorne（1939）最初研究的L. pacificum重新描述为L. distinctum sp. n.，体长1.04-1.13 mm，唇区连续，宽约10.5 μ m，齿突长14.0-15.5 μ m，开口占颈长的47-49%，颈长273-292 μ m，咽部扩张123-134 μ m，占颈长的45-46%，子宫短，阴道后壁有两片，外阴纵行（V = 52），尾圆圆锥形（13-17 μ m，c = 63-79，c' = 0.6-0.8），骨针腹侧强烈弯曲，长40-48 μ m，腹正中附属物11-12个，间隔较短。本文还对Labronema属内观察到的形态变异作了简要的讨论。
Type material of Labronema hyalinum and L. pacificum, as well as a recent population of L. neopacificum from Vietnam, all of them having in common a nearly continuous lip region, are examined, (re-)described and illustrated. Labronema hyalinum is characterized by its body 2.86-3.93 mm long, lip region truncate and 32-34 μ m wide, odontostyle 44-48 μ m long with aperture occupying 38-40% of its length, neck 747-856 μ m long, pharyngeal expansion 378-422 μ m long or 48-51% of total neck length and surrounded by a delicate (non-muscular) sheath, uterus tetrapartite and 469-608 μ m long or 3.7-4.3 times the corresponding body diameter, pars refringens vaginae with two separate pieces, vulva longitudinal ( V = 49-52), tail short and rounded (34-36 μ m, c = 93-101, c’ = 0.5-0.6), spicules 120 μ m long, and 31 contiguous ventromedian supplements. Labronema pacificum is characterized by its body 2.30-2.78 mm long, lip region continuous and 22 μ m wide, odontostyle 32 μ m long with aperture occupying about one-half its length, neck 517-600 μ m long, pharyngeal expansion 305 μ m long or 51% of total neck length, V = 47, tail short and rounded (23- 36 μ m, c = 78-100, c’ = 0.4-0.6), spicules 82 μ m long, and 16-22 nearly contiguous ventromedian supplements. New data, including SEM observations, are provided for L. neopacificum . The material originally studied by Thorne (1939) as belonging to L. pacificum is re-described as L. distinctum sp. n., being characterized by its body 1.04-1.13 mm long, lip region continuous and about 10.5 μ m wide, odontostyle 14.0-15.5 μ m long with aperture occupying 47-49% of its length, neck 273-292 μ m long, pharyngeal expansion 123-134 μ m long or 45-46% of total neck length, uterus short, pars refringens vaginae with two separate pieces, vulva longitudinal ( V = 52), tail rounded conoid (13-17 μ m, c = 63-79, c’ = 0.6-0.8), spicules strongly curved ventrad and 40-48 μ m long, and 11-12 shortly spaced ventromedian supplements. A short discussion on the morphological variation observed within the genus Labronema is also presented.