| 词条 | Aspidosiphon elegans |
| 释义 |
| image = | name = Aspidosiphon elegans | regnum = Animalia | phylum = Sipuncula | classis = Sipunculidea | ordo = Sipunculiformes | familia = Aspidosiphonidae | genus = Aspidosiphon | species = A. elegans | binomial = Aspidosiphon elegans | binomial_authority = (Chamisso & Eysenhardt, 1821)[1] | synonyms = *Aspidosiphon brocki Augener, 1903
| synonyms_ref = [1] }} Aspidosiphon elegans is a species of unsegmented benthic marine worm in the phylum Sipuncula, the peanut worms. It is a bioeroding species and burrows into limestone rocks, stones and corals. It occurs in the western Indo-Pacific region, the Red Sea, and the tropical western Atlantic Ocean, and is invasive in the eastern Mediterranean Sea. DescriptionAspidosiphon elegans can grow up to {{convert|80|mm|in|0|abbr=on}} in length, but {{convert|25|mm|in|1|abbr=on}} is a more usual size. The introvert is at least as long as the trunk and both are smooth and white. The tip of the introvert bears the oral disc with the mouth and six to twelve short tentacles. The distal part of the introvert bears rings of two-pronged hooks while the proximal part bears scattered, dark-coloured conical hooks. The anal shield is ungrooved while the caudal shield is poorly developed and paler in colour than the anal shield. There are a pair of light-sensitive eye spots and a pair of nephridia.[3][2]Distribution and habitatThis peanut worm is found in shallow waters in the northwestern Indian Ocean and the Red Sea, and the Levantine Sea, having arrived there at the latest by 1957 after the opening of the Suez Canal.[2] It also occurs on the Atlantic coast of Central America, but not on the Pacific coast.[3] It is a bioeroding organism and burrows into limestone rocks and stones, as well as coral heads, coralline algae and the shells of bivalve molluscs.[4] EcologyIn the Mediterranean Sea, this species was found burrowing in calcareous rocks, in coralline algae (Corallina mediterranea) and in the mussel (Brachidontes pharaonis),[2] another organism that has invaded the Mediterranean via the Suez Canal.[5] In this locality, there were said to be 25 individuals per square metre.[2] Reproduction in this species is by transverse fission; a constriction appears at the posterior end of the trunk, gradually deepening until the part becomes detached, with regeneration of the main body components then following.[2][6] References1. ^1 {{cite WoRMS |author=Saiz-Salinas, José |year=2009 |title=Aspidosiphon (Aspidosiphon) elegans (Chamisso & Eysenhardt, 1821) |id=136033 |accessdate=6 February 2019}} {{Taxonbar|from=Q1810419}}2. ^1 2 3 4 {{cite journal |author=Açik, Sermin |year=2008 |title=Occurrence of the Alien Species Aspidosiphon (Aspidosiphon) elegans (Sipuncula) on the Levantine and Aegean Coasts of Turkey |journal=Turkish Journal of Zoology |volume=32 |issue=4 |pages= 443–448 |url=https://web.archive.org/web/20170812065956/https://journals.tubitak.gov.tr/zoology/issues/zoo-08-32-4/zoo-32-4-13-0709-4.pdf }} 3. ^{{cite book|author=Cutler, Edward B. |title=The Sipuncula: Their Systematics, Biology, and Evolution|url=https://books.google.com/books?id=vSVzDwAAQBAJ&pg=PA370 |year=2018 |publisher=Cornell University Press |isbn=978-1-5017-2364-3 |page=370}} 4. ^1 {{cite book|author1=Ferreiro-Vicente, Luis M. |author2=Saiz-Salinas, José I. |author3=Açik, Sermin |author4=Sánchez-Lizaso, José L. |title=Guide to the Mediterranean sipunculans |url=https://books.google.com/books?id=khYWDQAAQBAJ&pg=PA31 |year=2016 |publisher=Universidad de Alicante |isbn=978-84-9717-434-3 |pages=31–33}} 5. ^{{cite web | url = http://www.cabi.org/isc/datasheet/109127 | title = Brachidontes pharaonis | accessdate = 7 February 2019 | publisher = cabi.org|work = The Invasive Species Compendium}} 6. ^{{cite web |url=https://repository.si.edu/bitstream/handle/10088/4491/sms_rice_10.pdf |title=Sipuncula |author=Rice, Mary E. |author2=Pilger, John F. |year=1988 |website= |publisher= |accessdate=6 February 2019}} 6 : Sipunculans|Fauna of the Atlantic Ocean|Fauna of the Indian Ocean|Fauna of the Red Sea|Animals described in 1821|Taxa named by Adelbert von Chamisso |
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