| 词条 | Ocnus planci |
| 释义 |
| name = Ocnus planci | image =Ocnus_planci_(Brandt,_1835).jpg | image_caption = Oncus planci | image_width = 200px | regnum = Animalia | phylum = Echinodermata | classis = Holothuroidea | ordo = Dendrochirotida | familia = Cucumariidae | genus = Ocnus | species = O. planci | binomial = Ocnus planci | binomial_authority = Brandt, 1835[1] | synonyms = Cladodactyla planci Brandt, 1835 Cucumaria planci Von Marenzeller, 1893 Holothuria brunneus (W. Thompson, 1840, ex Forbes MS), non Chamisso & Eysenhardt, 1821 Ocnus brunneus Forbes & Goodsir, in Forbes, 1841 }}Ocnus planci is a species of sea cucumber in the family Cucumariidae.[1] DescriptionOncus planci is a cylindrically-shaped sea cucumber grow up to 150 mm in length, and 35 mm in thickness they have a brownish coloration. They have ten tentacles and retractile tube like feet arranged in five double rows.[2] They have thick smooth leathery skin.[3]NeotanyOncus planci are known to show neotany. The neotenous form have a single row of tube feet and are less than an inch long. They were first mistaken for separate species and was given the biological name Ocnus brunneus.[4] ReproductionAdult reproduce sexually by spawning in spring and the neotenous form reproduce asexually by transverse binary fission. DistributionThey are found in European waters and west Africa. The neotenous form being distributed in the north. HabitatThey are epifaunal species on invertebrates and rocks and are found from depths of 15–175 m. DietThey are suspension feeders. The eight large and two small feeding tentacles are branched, leaf-like, and lighter in colour than the body.[5][6] Notes1. ^1 {{cite web|title=Ocnus planci (Brandt, 1835)|url=http://www.marinespecies.org/aphia.php?p=taxdetails&id=124647|work=WoRMS|publisher=WoRMS|accessdate=7 July 2013}} {{Taxonbar|from=Q15730448}}{{holothurioidea-stub}}2. ^ 3. ^{{cite web|title=Ocnus Planci|url=http://species-identification.org/species.php?species_group=echinodermata&id=76|publisher=Marine Species of the North Sea|accessdate=7 July 2013}} 4. ^Bulletin of the British Museum (Natural History) Zoology series 47 pg 265-270 5. ^ 6. ^ 2 : Cucumariidae|Animals described in 1853 |
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