filiform Round and very slender; cord-like; in the form of a thread or filament, e.g. first dorsal ray in Chauliodus (Chaliodontidae), a branchiostegal ray.

• 丝状圆且非常细长的；像绳索一样的；例如在蝰鱼(巨口鱼科)的第一背鳍鳍条，鳃条骨。