| 词条 | Opisthostoma vermiculum |
| 释义 |
| image = | status = CR | status_system = IUCN3.1 | regnum = Animalia | phylum = Mollusca | classis = Gastropoda | unranked_superfamilia = clade Caenogastropoda informal group Architaenioglossa | superfamilia = Cyclophoroidea | familia = Diplommatinidae | genus = Opisthostoma | species = O. vermiculum | binomial = Opisthostoma vermiculum | binomial_authority = Clements & Vermeulen, 2008[1] | synonyms = }} Opisthostoma vermiculum is a species of minute land snail with an operculum, a terrestrial gastropod mollusk or micromollusk in the family Diplommatinidae. The shell possesses four different coiling axes; the most for any known living gastropod. This member of the Diplommatinidae family is endemic to Malaysia. Its natural habitat is tropical limestone outcrops.[1][2] Shell descriptionWhen the species was discovered, thirty-eight specimens were collected: the shell shapes showed low variation. The snail shell is {{convert|1.5|mm|in}} high and {{convert|.9|mm|in}} wide. This is the first snail reported that has a shell which shows four discernible coiling axes. The body whorls of the shell thrice detach and twice reattach to preceding whorls without any support. The detached whorls coil around three secondary axes in addition to their primary teleoconch axis. All specimens showed these features in a homogeneous way. Opisthostoma vermiculum was selected as one of "The Top 10 New Species" described in 2008 by The International Institute for Species Exploration at Arizona State University and an international committee of taxonomists.[3]ConservationThese snails are found only on limestone karsts. There is significant quarring activities in the area, and this makes the species particularly vulnerable to extinction. EtymologyThe specific epithet, vermiculum, is derived from Latin, "meaning "wormy".[2] References1. ^1 Clements R., Thor-Seng Liew T.-S., Vermeulen J. J. & Schilthuizen M. (23 April 2008) "Further twists in gastropod shell evolution". Biology Letters 4(2): 179-182. {{doi|10.1098/rsbl.2007.0602}} PDF 2. ^1 http://species.asu.edu/2009_species06 3. ^{{cite web |url=http://asunews.asu.edu/20090522_top10species |title=Archived copy |accessdate=2016-02-17 |deadurl=yes |archiveurl=https://web.archive.org/web/20090528210712/http://asunews.asu.edu/20090522_top10species |archivedate=28 May 2009 |df=dmy-all }} External links
4 : Endemic fauna of Malaysia|Invertebrates of Malaysia|Diplommatinidae|Gastropods described in 2008 |
| 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。