广州毛刺线虫新种的描述

DESCRIPTION OF Trichodorus guangzhouensis n.sp. (NEMATODA: TRICHODORIDAE)

广州毛刺线虫新种 ( Trichodorus guangzhouensisn.sp.)采集于广州市白云区的莴苣 ( L actucasativa)根际土壤。其主要鉴别特征是虫体和瘤针较短 ;雄虫的 3个腹中颈乳突位于瘤针后和排泄孔前 ,交合刺短、无刚毛和条纹 ,泄殖腔前有 3个腹中生殖乳突 ,精细胞大、有大且呈香肠形的核 ;雌虫阴门纵裂 ,阴门骨化结构小、三角形到园三角形、相距较近 ,阴道长度大于阴门处体宽的 1/ 3,受精囊大、有精子。该新种在多数形态特征测量数据上 ,以及雄虫的 3个腹中颈乳突位置、泄殖腔前腹中生殖乳突数量、精细胞形态 ,雌虫受精囊和阴门骨化结构形态等特征上 ,与背弯毛刺线虫 ( Trichodorusreduncus Siddiqi & Sharma,1995)相近似。但它们在雄虫交合刺和引带形态、第一腹中生殖乳突 ( SP1)的位置 。

Trichodorus guangzhouensis n. sp. was collected from soil around roots of Lactuca sativa in Guangzhou. This new species is characterized by a short body (569 777 μm) and a short onchiostyle (33.8 42.9 μm); in male: by three ventromedian cervical papillae between onchiostyle base and excretory pore, by short spicules (28.6 36.4 μm) with a wide manubrium,a slender shaft distally tapered at mid level with a constriction and without bristles and striation, by the arrangement of the three precloacal supplements with the posteriormost one (SP1) at level of the spicule head when spicule retracted, by large sperm cells with sausage shaped nucleus; in female: by vulva, a longitudinal slit in ventral view, by vagina, cylindrical shaped to more or less pear shaped, vagina length 38% 58% of corresponding body width, by small vaginal sclerotized pieces (1.8 2.1 μm), triangular to rounded triangular in lateral view and slightly separated (0.9 1.3 μm),by one lateral body pore on each side about one body width posterior to the vulva. T. guangzhouensis n.sp. resembles Trichodorus reduncus Siddiqi & Sharma, 1995 in morphometric data, in position of three ventromedian cervical papilla, in general shape of spicule without bristles and striation, in the presence of large sperm cells with sausage shaped nucleus,in shape of the vaginal sclerotizations and the presence of large spermatheca filled with sperm. The new species differs mainly from T. reduncus in male in position of the posteriormost precloacal supplement: at level of spicule when spicules retracted vs shortly anterior to spicule head; in spicule shape: with slight constriction vs cornical shaft; in gubernaculum proximal end: without dorsally hooked vs dorsally hooked. In females, the new species differs from T. reduncus mainly in the shape of the vulva in ventral view: longitudinal slit vs transverse slit in T. reduncus. Type specimens are deposited in the Plant Nematology Laboratory, South China Agricultural University, Guangzhou, China.