The calcareous or sandy tube of some sedentary marine worms, such as fan worms.
巢管（缨鳃蚕等海洋蠕虫生活在其中的石灰质的或用泥沙粘成的管子）
Example sentencesExamples
Thin sections were made of the carbonates containing worm tubes.
A few mineralized animal fossils, including sponge spicules and probable worm tubes, are known from the Vendian period immediately preceding the Cambrian.
Some of the outgrowths result from the colony encrusting worm tubes or other cylindrical objects but many are solid with a firm gelatinous core.
Ammonoids, gastropods, and serpulid worm tubes are also recorded.
Yet another mode of preservation is represented by 50 irregularly cylindrical objects originally interpreted by Boyd as silicified burrows or worm tubes.