四种两性生殖卤虫雄性抱持器的形态比较

COMPARATIVE STUDY OF THE MALE CLASPER AND ITS FRONTAL KNOB OF FOUR SPECEES OF ARTEMIA

对四种卤虫:A.franciscana,A.sinica,A.persimilis,A.tunisiana的雄性抱持器及其额结节进行比较观察。在额结节表面有两种突起。树突和感觉毛。两者的排列和分布复杂,在不同种卤虫之间,它们的差别很明显。据此,额结节辅以抱持器的形态大小可作为卤虫的鉴定的重要标志。四种卤虫的简易鉴定法:1.A.franciscana额结节小,约150μm,抱持器粗壮,与其粗短体形一致。其体宽体长比值为0.17。2.A.sinica额结节小,约150μm,抱持器纤细,与其细长体形一致,其体宽体长比值为0.10。3.A.persimilis额结节大,半圆形,直径约350μm,抱持器端节前沿呈弧形。4.A.tunisiana额结节大,圆锥形,高350μm,抱持器端节前沿呈拐角突起。

Four species of Artemia: A.franciscana,A.sinica,A.persimilis,and A.tunisiana were observed comparatively through their male clasper and its frontal knob.On the surface of the frontal knob there are two types of processes: spines and sensory setae.The arrangement and distribution of spines and sensory setae are complex and differ greatly in di-ferent species.According to the complexity and differences of the frontal knob,they could be used as a critical index together with the shape and size of the claspcr for species identification.These four species of Artemia can be simply identified as follows: 1.A.francis-Cana: frontal knob small,about 150μm,clasper broad and strong and suits to its thick and short body.The ratio of its body width to body length 0.17.2.A.sinica: frontal knob small,about 150μm,clasper thin and slender and suits to its thin and slender body.The ratio of its body width to body length 0.10.3.A.persimilis:frontal knob big,hemisphere in shape,about 350μm in diameter,the frontal edge of the telopodite of clasper arc shaped.4.A.tnuisiana: frontal knob big,subconical in shape,about 350μm in height,the frontal edge of the telopodite of clasper angled curve in shape.