摘要
高肌虫和其他节肢动物一样也存在性双形现象。认识这种双形现象对于提高化石种的真实性和客观性具有重要的意义。Andres(1969)描述的Hipponicharion loculatum在壳的近腹部内层上有数目不定(2～10个)的圆形小坑。这种小坑的形态、大小与已知的介形虫和高肌虫卵粒相近,且某些介形虫的雌性体也具这种构造,故Andres(1969)描述的标本为雌性体。文中的Dabashanella retroswinga保存6个阶段的蜕壳,从第四阶段开始出现了壳形分异,代表雌、雄两种壳体;具镶边构造的高肌虫(Tsungiella epicharis,Parah,limbus)可能与介形类相似为雌性体;秭归庙河水井沱组从下到上有两类形态不同,构造完全相同的壳,也可能代表了同种雌、雄不同的两种壳体。
In Braboriida there is sexual dimorphism, as well as in the other arthropods.Some specimens of Hipponicharion loculatum described by Andres (1969) are preserved only with inner layer of carapace and show 2—10 small round pits in anteroventral part (Text Fig. 1;P1. 1,figs. 1～3). These pits are similar to loculi in the female carapace of ostracods Tetradella,Loculicythereta in size,number,shape and location,so the specimens described by Andres(1969) may represent female individuals of this species. Dabashanella retroswinga coming from Sichuan shows about 6 molt stages (Text Fig. 3). From the fourth stage two carapace patterns coming to existence may represent nale and female individuals respectively,Male individuals are longer,rigider in valve and more in number than female (Text Fig. 4;Pl. 1, figs. 6～8). Specimens of Tsunyiella epicharis Huo et Cui Parahipponicharion limbus Shu are ventrally bordered with a frill, (Text Fig. 6;Pl. 1, fig. 9),which is usually taken as a characteristic of female bodies in ostracods. Bradoriids in the Miaohe section of Zigui,Hubei are morphologically classified into two types(Text Fig.7; Pl.1,figs.10～15). The two patterns may stand for male and female individuals respetively of Tsunyiella luna ziguiensis(Lin).
出处
《西北大学学报（自然科学版）》
CAS
CSCD
1992年第3期361-366,F003,共7页
Journal of Northwest University（Natural Science Edition）
基金
国家自然科学基金资助课题
关键词
高肌虫
性双形
寒武纪
Bradoriida
Dimorphism
Cambrian
