【摘要】 本文分析了介形亚纲古足目和速足目两大类的壳瓣形态,据流体力学原理,得出了有关形态因素和游泳能力的函数关系。从而分析了各形态类型对游泳生活的适应,指出它们的游泳能力与觅食方式、生活环境之间存在相互制约关系。更多还原

【Abstract】 This paper systematically analyses the shell forms of the genera belonging to ostracods Palaeocopida and Podocopida. These 15 shell forms under study include the elongate-elliptic, ladder-like, water chestnut-like, peanut- or pod-shaped, reniform, triangular, globate, convexo-concave, plough-shaped, rhomboidal, rectangular, lobe nodes, wide margins, cross ridges and lateral alae types.First to be analysed are the characteristics of shell forms, habits （modes of life ） and swimming power. Then, according to the formula of hydromechanic the swimming power of ostracods can be calculated by using the following two formulate,Here （ F_D ） f=friction drag; K=constant of experience; ρ=fluid density; U₀=movement velocity of ostracods; ν=sticky coefficient; L=carapace length; Ω=surface area of carapaces; W=carapace width.According to formula （3）, the swimming powers of some ostracod genera are calculated as follows: Shleesha （ peanut-shaped type ）=2.74 cm/sec., and Fabalioypris （ elongate-elliptic type ） = 6.91cm/sec. These calculations are identical with the qualitative analyses.更多还原