n.棘頭蟲；棘頭綱蟲
The frequency distribution of the acanthocephalan and the nematode was over-dispersed with parameter of negative binomial distribution of 0.2539 and 0.2176 respectively. 棘頭蟲和線蟲的種群在黃鱔種群中均呈聚集分布
棘頭類
