| 单词 | beard worm |
| 释义 | > as lemmasbeard worm beard worm n. any of the long, slender marine tube worms constituting the polychaete family Siboglinidae, having a beard-like plume of vascular tentacles; a pogonophoran.Beard worms lack a mouth and gut, instead absorbing nutrients from the water and the metabolism of symbiotic bacteria. They were formerly classified as a distinct phylum Pogonophora, but more recent genetic research has identified them as aberrant polychaete annelids. Cf. pogonophoran n., vestimentiferan n. ΚΠ 1959 L. H. Hyman Invertebrates V. xviii. 210 The Pogonophora, or beard worms.., are excessively long, slender worms that inhabit a closely fitting tube of their own secretion. 1998 L. Margulis & K. V. Schwartz Five Kingdoms (ed. 3) iii. 286/1 Pogonophorans, the beard worms, are sessile benthic marine worms that live in fixed upright chitin tubes that they secrete on sediments, shell, or decaying wood on the ocean floor. 2009 J. Dawes et al. Exploring World of Aquatic Life 47 (caption) This colony of beard worms lives around a thermal vent..1.5 miles down on the floor of the Pacific Ocean. < as lemmas |
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