Phoronids (scientific name Phoronida, sometimes called horseshoe worms) are a small phylum of marine animals that filter-feed with a lophophore (a "crown" of tentacles), and build upright tubes of chitin to support and protect their soft bodies. They live in most of the oceans and seas, including the Arctic Ocean but excluding the Antarctic …

Horseshoe worm, phylum name Phoronida, a small group (about 12 species) of wormlike marine invertebrates that live in tubes secreted by special glands. These protective tubes become encrusted with shells or are buried in sand. Horseshoe worms, or phoronids, either are solitary or occur in groups of

帚虫是帚形动物门动物，成体寿命数年，每年可产生数千个自由游泳的幼体。幼体数周後变态。多分布于温带的潮间带或浅海中，但也在热带和深海有看见。只有2属（帚虫属〔Phoronis〕及Phoronopsis属）16种被确认。本门动物无肯定的化石记录。根据本门动物的体形，其分类地位与苔藓动物和腕足动物 ...

2024年10月7日 · Horseshoe worms, also called phoronids, are a small group of marine organisms included in the phylum Phoronida.They are characterized by a lophophore, a specialized crown of tentacles that aids in filter-feeding. Encased in protective tubes made from chitin, these worms inhabit various marine environments, from shallow coastal waters to depths of up to 400 meters.

However, phoronids -- or "horseshoe worms," as they are sometimes called -- may be abundant in shallow marine sediments at certain localities. Phoronids are elongated and worm- shaped, but the gut loops and ends close to the mouth, instead of passing straight through the body as in annelids and many other wormlike organisms.

Phoronids (scientific name Phoronida, sometimes called horseshoe worms) are a small phylum of marine animals that filter-feed with a lophophore (a 'crown' of tentacles), and build upright tubes of chitin to support and protect their soft bodies. They live in most of the oceans and seas including the Arctic Ocean but excluding the Antarctic Ocean, and …

2020年3月4日 · Phoronida (also known as Horseshoe worms) is a very small phylum, containing 11 species of generally small marine worms. They are related to the other lophophorate phyla Brachiopoda and Bryozoa. They live in burrows lined with secreted tubes, mostly in shallow coastal waters. Normally the worm’s body remains hidden within their tubes and all ...

Phoronis ovalis is the smallest known species of horseshoe worms, [3] growing to an extended length of 15 mm (0.6 in) and a diameter of 0.15 to 0.35 mm (0.006 to 0.014 in). It exhibits many primitive traits. The lophophore is simple and oval in shape, with 11 to 28 tentacles. The giant nerve fibre typical of the genus is not present. The animal is transparent, sometimes with a …

horseshoe worms. phoronids. Kingdom. Animalia. Location in Taxonomic Tree . Phylum. Phoronida. Identification Numbers. TSN: 155456. Geography. Launch Interactive Map. Working with others to conserve, protect and enhance fish, wildlife, plants and their habitats for the continuing benefit of the American people.

Horseshoe worms (or Phoronids) are a small group of marine worms. There are only around 20 species known. They occur at in all oceans and seas (except the polar seas) and are usually found at depthsup to 70 metresr with some found at aup to 400 metres in depth. The adults are tube worms, and produce tubes made from chitin in which to live.