华中八腱索线虫新种记述（线虫纲：索科）

DESCRIPTION OF OCTOMYOMERMIS HUAZHONGENSIS SP.NOV. (NEMATODA:MERMITHIDAE)

报道了采于湖北枣阳、武汉及湖南长沙等地稻田的八腱索属线虫一新种，命名为华中八腱索线虫（Ｏｃｔｏｍｙｏｍｅｒｍｉｓｈｕａｚｈｏｎｇｅｎｓｉｓｓｐ．ｎｏｖ．），描述了形态特征。

Octomyomermis huazhongensis was found in the paddy field of Zaoyang(32°10′N, 112°45′E),Wuhan(30°31′N, 114°20′E),Hubei Province and in Changsha (28°12′N,113°E),Hunan Province, in 1986～1990. Measurements are in micrometres unless otherwise indicated. L=body length,W=body width,HW=head width measured at the level of papillae,AW=width of body at anus; V=distance from mouth to vulva expressed as percentage of the total length. Octomyomermis huazhongensis sp.nov(figs.1～8) Adults:Body elongate,white in colour,mouth shifted slightly ventrad in position; six cephalic papillae arranged in one plane,without obvious cuticular fibers;eight hypodermal chords;amphids are bag or rod shaped,Vagina in barrel shaped vaginal canal straight,perpendicular to longitudinal axis of body;two separate spicules,spicules length:AW<2,genital papillae three rows, the middle row bifurcating before the cloaca,genital papillae arranged sparsely before the bifurcation and closely after it. Male: n =10 L. 14.61 mm(11.48～20.00, SE =0.56),HW.43.05(40.13～53.50, SE = 0.71) ,W. at nerve ring 112.80 (96.06～126.46, SE =1.00),W. at midbody region 188.99(138.54～241.98, SE =1.76),AW. 144.29(114.30～172.67, SE =1.36),giving ratios of 0.38∶1∶1.68∶1.28,amphids 13.58(12.16～14.59, SE =0.28)× 3.26 ( 1.22 ～6.54, SE =0.42);distance from nerve ring to anterior end 246.29 (211.73 ～283.33, SE =0.42),distance from nerve ring to anterior end:L=0.017(0.014～0.022, SE =0.0009),tail length 122.74(103.36～172.07, SE =1.52),L:tail length 119.31 (92.88～148.50, SE =4.98),spicules length 157.85(109.44～ 194.56, SE =1.54),ratio of L to spicules length is 94.12(65.31～132.04, SE = 1.51); ratio of spicules length to AW is 1.12(0.76～1.65, SE =0.16),genital papillae in three rows, the middle row with 11.1(7～16, SE =0.53),from the anterior to the bifurcation, each of both rows with 16.4(15～21, SE =0.48)from the posterior to the bifurcation;lateral rows with 27.2(22.5～35, SE =0.61),cuticle thickness at the middle of the body 11.56(6.54～24.32, SE =0.70),distance from oesophagus end to tip of tail 283.53(206.72～347.18, SE =2.22),b=1.02(1.00～1.03, SE =0.003),oesophagus is 97.4%(97%～97.8%)of the total body length. Female: n =12 L. 20.44 mm(16.8～25.5, SE =0.49),HW.52.18(44.6～57.4, SE =0.58);W.at nerve ring 122.73(98.2～133.9, SE =0.92);W. at vagina 213.9(186.2～ 274.1, SE =1.48),at the posterior end of the trophosome 88.32(40.8～140.3, SE = 1.37), giving ratios of 0.43∶1∶1.74∶0.72,amphid 13.84(11.5～16.6, SE =0.31)× 2.67 (1.9～5.1, SE =0.33),distance from nerve ring to anterior end 275.08(178.5～369.8, SE =1.84),distance from nerve ring to anterior end:L=0.014 (0.010 ～ 0.018), Vagina barrel shaped,Vaginal canal straight,V=49.20%(43.13～54.29%, SE =0.48),cuticle thickness at the vagina 11.07(6.4～16.6, SE = 0.50), distance from oesophagus ending to tip of tail 360.33(197.6～720.4, SE = 3.73), oesophagus is 98%(96%～99%) of the body length. Egg: n =20;elliptic,length 92.87(80～105, SE =1.84),width 82.0(75～90, SE =1.51). Pre parasitic juveniles:n=10 L 1087.94(988.92～1185.72, SE =19.96),greates body width 13.10(12.30～14.15, SE =0.21),Stylet length 19.28(18.45～20.30, SE =0.21),Posterior length 568.99(551.04～603.93, SE =7.59). Рost parasitic juveniles:n=2. Tail appendage length 92.5(80.105). Type specimens:holotype 1♂,allotype1♀,Paratype 9♂♂ and 11♀♀ are deposited in the College of Life Sciences of Central China Normal University, Wuhan. Diagnosis: The new species is clearly distinguished from other species of the genus in male’s particular genital papillae and tail shape. Genital papillae in three rows is divided into two pa