| 词条 | Rhabdopleura normani |
| 释义 |
| image = Rhabdopleura normani Sedgwick.png | image_caption = | status = | regnum = Animalia | phylum = Hemichordata | classis = Pterobranchia | ordo = Rhabdopleurida | familia = Rhabdopleuridae | genus = Rhabdopleura | species = R. normani | binomial = Rhabdopleura normani | binomial_authority = Allman, 1869[1][2] | synonyms = Rhabdopleura mirabilis Sars, 1872[2] }} Rhabdopleura normani is a small, marine species of worm-shaped animal. It is a sessile suspension feeder,[3] lives in clear water, and secretes tubes on the ocean floor. DescriptionThis species grows in colonies. Each individual achieves a length of 0.5 mm, with a total colony length of approximately 20 mm.[4][5] Located on the tentacles are lateral, frontal, and frontolateral ciliary bands. These are 8-13 μm in length and composed of cilia. In specimens collected in Bermuda, ciliated perforations were found. These ran down the length of the arms, in particular, between the bases of other tentacles laying adjacent.[3] DistributionRhabdopleura normani is widely distributed along the coastlines of the Bering Sea, Norwegian Sea, Atlantic Ocean, and Mediterranean Sea.[6] It has also been found in Bermuda. HabitatThis species lives in colonies on the ocean floor. It has been found at depths ranging from 5 m to 896 m, but most commonly occurs between 100 m and 300 m.[7][8] FeedingR. normani does not use mucus to capture food. Instead, it uses only a local reversal of a ciliary beat. It is also capable of rejecting unsuitable food particles employing several distinct methods.[3]ReproductionBoth sexes live together in the colonies. Females have distinctive basally-coiled tubes in which they brood their eggs, each 200 μm in size. As these yolky eggs develop, they cleave radially, and become larvae. These larvae are ciliated, lecithotrophic, and oblong, achieving a length of 400 μm. They can be identified in the following ways:[4]
The ventral depression is actually a glandular epithelium, as opposed to invaginating endoderm. The larval cocoon and adult tube are secreted from this depression.[4] Inside, the peritoneum of the coelomic cavities starts to disconnect from the main mass of the yolky mesenchyme cells. After breaking free, the larva then swims using its cilia.[4] References1. ^{{cite web|url=http://www.sealifebase.org/summary/SpeciesSummary.php?id=61095 |title=Rhabdopleura normani |publisher=Sealifebase.org |date= |accessdate=2011-11-03}} 2. ^1 {{cite web|url=http://www.marinespecies.org/aphia.php?p=taxdetails&id=137611 |title=WoRMS - World Register of Marine Species - Rhabdopleura normani Allman, 1869 |publisher=Marinespecies.org |date= |accessdate=2011-11-03}} 3. ^1 2 {{cite journal|last= Halanych|first= K.M.|year= 1993|title=Suspension Feeding by the Lophophore-Like Apparatus of the Pterobranch Hemichordate Rhabdopleura normani|journal= Biological Bulletin|volume= 185|number= 3|pages= 417–427|doi=10.2307/1542482|pmid= 29300629|jstor=1542482}} 4. ^1 2 3 {{cite journal|title= Ultrastructure of Adult Gonads and Development and Structure of the Larva of Rhabdopleura normani (Hemichordata: Pterobranchia)|date=1987-06-10 |doi=10.1111/j.1463-6395.1988.tb00906.x |volume=69 |issue=2 |journal=Acta Zoologica |pages=95–109|last1 = Lester|first1 = Susan M.}} 5. ^{{cite web|url=https://lhsvirtualzoo.wikispaces.com/Rhabdopleura+normani |title=LHSVirtualZoo - Rhabdopleura normani |publisher=Lhsvirtualzoo.wikispaces.com |date=2011-03-17 |accessdate=2011-11-03}} 6. ^A.R.D. Stebbin, 1970, The Status And Ecology Of Rhabdopleura Compacta (Hemichordata) From Plymouth, J. mar. biol. Ass. U.K., 50, 209-221, p.210 7. ^http://www.app.pan.pl/archive/published/app16/app16-415.pdf 8. ^http://journals.cambridge.org/download.php?file=%2FMBI%2FMBI50_01%2FS0025315400000722a.pdf&code=edd4e528e5af318eec9cdaa4de02bcf5 External links
2 : Hemichordates|Animals described in 1869 |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。