| 词条 | Thyonicola dogieli |
| 释义 |
| name = Thyonicola dogieli | image = | image_caption = | regnum = Animalia | phylum = Mollusca | classis = Gastropoda | unranked_superfamilia = clade Caenogastropoda | superfamilia = Eulimoidea | familia = Eulimidae | genus = Thyonicola | species = T. dogieli | binomial = Thyonicola dogieli | binomial_authority = (A. V. Ivanov, 1945)[1] | synonyms_ref = [1] | synonyms = Parenteroxenos dogieli A. V. Ivanov, 1945 }} Thyonicola dogieli is a parasitic species of gastropod mollusc in the family Eulimidae. It parasitises sea cucumbers in the northeastern Pacific Ocean. DescriptionThis slender elongated mollusc does not have a shell and takes the form of a long tube, coiled like a spring, or tied in knots, and filled with eggs.[2][4] It holds the record as the longest gastropod mollusc in the world, one individual having been found to be {{convert|128|cm|in|0|abbr=on}} long when uncoiled.[3] EcologyThyonicola dogieli is a parasite of sea cucumbers such as Cucumaria miniata.[2] It inhabits the gut of the sea cucumber, being attached at the anterior end. It has no digestive tract and absorbs nutrients through its cuticle. It is a hermaphrodite; the testis is located near the anterior end and the ovary near the posterior end (this enables the sperm to be carried to the eggs amid the flow of the contents of the host's gut). The body is filled with maturing eggs enclosed in cocoons. When the veliger larvae, which have miniature coiled shells and operculums, are sufficiently developed, the cocoons are released into the sea cucumber's gut and pass out into the sea with its faeces.[4]On encountering sea water the cocoons burst open and the free-living larvae are liberated. They are about {{convert|0.1|mm|in|3|abbr=on}} long, and unless swallowed by a sea cucumber, they will soon die, However, any that are ingested undergo metamorphosis in the host's gut, lose their shell and mantle and burrow into the wall of the gut with the aid of a glandular secretion. As the juvenile mollusc grows, its posterior end pushes its way into the sea cucumber's body cavity, and the gonads develop, the interior of the mollusc becoming a brood pouch.[4][5] References1. ^1 {{cite WoRMS |author=Bouchet, Philippe |year=2010 |title=Thyonicola dogieli (A. V. Ivanov, 1945) |id=537141 |accessdate=12 January 2018}} {{Commons category|Eulimidae}}{{Taxonbar|from=Q14491853}}2. ^1 {{cite book|author1=Lambert, Philip |title=Sea Cucumbers of British Columbia, Southeast Alaska and Puget Sound |url=https://books.google.com/books?id=DyyJIb2IvKAC&pg=PA60 |year=1997 |publisher=UBC Press |isbn=978-0-7748-0607-7 |page=60}} 3. ^{{cite book|author1=Carwardine, Mark |title=Animal Records|url=https://books.google.com/books?id=T3FEKopUFkUC&pg=PA245 |year=2008 |publisher=Sterling Publishing Company, Inc.|isbn=978-1-4027-5623-8 |page=245}} 4. ^1 2 {{cite book|author=Cheng, Thomas C. |title=General Parasitology |url=https://books.google.com/books?id=d4GQlYzode8C&pg=PA741 |year=2012 |publisher=Elsevier Science|isbn=978-0-323-14010-2 |pages=741–742}} 5. ^{{cite book|author=Combes, Claude |title=The Art of Being a Parasite|url=https://books.google.com/books?id=bEtEL2z3hXcC&pg=PA25 |year=2005 |publisher=University of Chicago Press|isbn=978-0-226-11438-5 |pages=25–28}} 2 : Eulimidae|Gastropods described in 1945 |
| 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。