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单词 Acorn worm
释义

Acorn worm

原声例句
科学洞察双语版

On the tree of life, this acorn worm is closer to us than they are to lobsters, but spine-to-guts, their embryos show the lobster pattern, and not ours.

在生命之树上，这种橡子虫比龙虾更接近我们，但脊椎到内脏，它们的胚胎显示出龙虾的形状，而不是我们的。

中文百科

肠鳃纲

Planos coronal y sagital (figura 1 y 2) que muestra la anatomía interna de la prosbócide, el collar y parte superior del tronco de un enteropneusto.
Structure of branchial region – bc, coelom. tb, tongue-bars. ds, mesentery. pr, ridge. vv, vessel. gp, gill-pore. dn, dorsal nerve. dv, vessel. œ, oesophagus. vs, mesentery. vn, ventral nerve.[8]

肠鳃纲是半索动物门的一个纲。总共约有70多种。大多数种类在泥沙中穴居，或在石块下生活。例如柱头虫（Balanoglossus）。

英语百科

Acorn worm 肠鳃纲

Structure of branchial region – bc, coelom. tb, tongue-bars. ds, mesentery. pr, ridge. vv, vessel. gp, gill-pore. dn, dorsal nerve. dv, vessel. œ, oesophagus. vs, mesentery. vn, ventral nerve.[8]
Structure of anterior end – a, Arrow from proboscis-cavity (pc) passing to left of pericardium (per) and out through proboscis pore-canal. b1, arrow from central canal of neurochord (cnc) passed out through anterior neuropore. b2, ditto; through posterior neuropore. c, arrow intended to pass from 1st gill-pouch through collar pore-canal into collar-coelom (cc). cts, posterior limit of collar. dv, dorsal vessel passing into central sinus (bs). ev, efferent vessel passing into ventral vessel (vv). epr, epiphysial tubes. st, stomochord. vs, ventral septum of proboscis. sk, body of nuchal skeleton. m, mouth. th, throat. tb, tongue-bars. tc, trunk coelom.[8]
Meioglossus psammophilus.

The acorn worms or Enteropneusta are a hemichordate class of invertebrates consisting of one order of the same name. They are closely related to the echinoderms. There are about 90 species of acorn worm in the world, the main species for research being Saccoglossus kowalevskii.
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更新时间：2026/8/18 4:31:40