云南西双版纳及其附近枝角类的研究

<正> 关于云南省的枝角类,迄今只有陆鼎恒(1939)、张玺与易伯鲁(1945)分别就该省中部的洱海和滇池所产者作过专文报导。此外,萧之的(1949)、黎尚豪等(1963)曾在中部的高原地带进行了湖泊调查,并记述了部分种类。至于该省南部热带地区的枝角类,尚无调查研究。

东钱湖的枝角类

<正> 一.引言枝角类为鱼类天然食料之一,也是最好的鱼类食料之一,幼鱼的全肠有时几乎充满了枝角类。但对于太小的幼鱼,就是鱼苗进入鱼池后饲养的最初三、四天,还不能吞食成年的枝角类,那时它们如果大量的过分繁殖,必然会抑制其它小型浮游动物的繁殖,间接地减少了这些鱼苗能吞下去的食料,这样反而使幼鱼的生长受到一定的限制。关于中国枝角类的种类及其分布,过去陆鼎恒(1939),张玺与易伯鲁(1945),以

Two new species of Actinolaimidae thorne, 1939 (Nemata : Dorylaimida) from China

Two new species of Actinolaimidae are described from China. Trachactinolaimus brevicaudatus n. sp. is 3.4-4.4 mm long; a = 40-60, b = 3.5-5.2, c = 20-21 in female and 34-39 in male; odontostyle length is 29-33 mu m; spicules are 67-77 mu m long; and the stoma has four onchia with numerous mural denticles. The female has a longitudinal vulva, and the male has 20 to 23 contiguous ventromedian supplements. Egtitus sinensis n. sp. is 1.7-2.2 mm long; a = 24-33, b = 3.1-3.9, c = 16-19 in female and 0.7-0.9 in male; odontostyle length is 25-29 mu m; spicules are 55-56 mu m long; and the prerectum 53-77 pm long. The cardia is short and blunt conoid, 13-19 mu m long. The male has 12 to 13 ventromedian supplements at intervals of 2-3 mu m.