Skip to content
Cnidaria

File:Cnidaria.png · Wikimedia Commons · See Wikimedia Commons

EntityQ25441· pop 91· linked from 3,152 articles

Also known as cnidarians, cnidarian

thumb|Chrysaora fuscescens|Pacific sea nettles, Chrysaora fuscescens

OverviewAI-generated

Cnidaria is a phylum within the kingdom Animalia, classified as an invertebrate. The taxon, described by Hatschek in 1888, has an accepted status and is a subclass of invertebrates. Its parent taxa include Radiata, Coelenterata, ParaHoxozoa, and Eumetazoa. Cnidarians reproduce sexually and inhabit marine, brackish, and freshwater environments. The phylum originated approximately 580 million years ago.

Records of Cnidaria are held by various institutions, including LACM, CMNH, FMNH, UWBM, and SDNHM, with records primarily from the United States. The taxon is referenced by 3,152 other encyclopedia articles.

Synthesized by Vinony from 32 facts across 7 sources: Wikidata, GBIF, PubMed, Gbif Occ, WoRMS, iDigBio, Vinony graph. Generated from structured data (not the Wikipedia text) and checked against those facts — may still contain errors.

Species

cnidarians

Cnidaria

PHYLUM

  1. KingdomAnimalia
  2. PhylumCnidaria
Habitatmarine, brackish, freshwater
Observations recorded39,696,101

刺胞動物門(學名:Cnidaria;/naɪˈdɛəriə/),又名刺絲胞動物門,是一個包含有超過2萬多個动物物种的门 ,皆為生活於水中(包括淡、海水或其他鹹水棲境), 刺胞動物曾經和櫛水母動物一起組成腔腸動物門,但隨着對這兩種動物的差異的認識,愈來愈多學者同意應該將櫛水母動物從刺胞動物獨立出來。 近期的系统发生学分析支持刺胞動物是一個单系群,而且與两侧对称动物是旁系群關係。在大約5.8億年前形成的岩石中發現了刺胞動物的化石,其他化石表明珊瑚可能在4.9億年前左右才出現,並在幾百萬年後出現多樣化。然而,線粒體基因的molecular clock分析表明,crown group(英语:crown group)的年齡要大得多,估計大約有7.41億年前,在寒武紀以至任何化石出現的時期還要早2億年。 刺絲胞动物门动物有如下特点: 大部分為肉食性,少部分種類獲得能量來自於體內共生生物行光合作用得來的。 其躯干呈辐射对称,水生,大多固着生活 体壁由两层细胞组成,表皮和肠表皮,两者之间有一层凝胶状的中胶层,起支持作用。 有肠腔,有一围口部(Peristom),既是口也是肛门。 有超过20种的刺胞,刺絲胞中含有刺丝囊。刺丝囊一端的鬃样突起的刺针,受刺激时,激起刺丝囊排空。刺絲胞的表面有突出,胞体内有棍状结构。刺胞内有高尔机体分泌物质,在压力作用下会释放。 在肠腔中进行胞外消化 弥散的神经系统/神經網(nerve net),呈网状 水母体有感觉器官,能感受光和重力 有雌雄同體或異體 水母、珊瑚、海葵、水螅都被歸類為刺絲胞動物。

via GBIF

Museum specimens

Specimen records
18,396
With media
395
Collections
LACM, CMNH, FMNH, UWBM, SDNHM, SIO
Recorded in
United States

Research

20,116 papers

via PubMed

~45 min read

Encyclopedic overview

29 sections
Contents
  • Etymology
  • Distinguishing features
  • Description
  • Basic body forms
  • Skeletons
  • Main cell layers
  • Polymorphism
  • Cnidocytes
  • Locomotion
  • Nervous system and senses
  • Feeding and excretion
  • Respiration
  • Regeneration
  • Reproduction
  • Sexual
  • Asexual
  • DNA repair
  • Classification
  • Ecology
  • Evolutionary history
  • Fossil record
  • Phylogeny
  • Interaction with humans
  • Notes
  • References
  • Further reading
  • Books
  • Journal articles
  • External links

thumb|Chrysaora fuscescens|Pacific sea nettles, Chrysaora fuscescens

Cnidaria ( ) is a phylum in kingdom Animalia containing over 11,000 species of aquatic invertebrates found both in freshwater and marine environments (predominantly the latter), including jellyfish, hydroids, sea anemones, corals and some of the smallest marine parasites. Their distinguishing features are an uncentralized nervous system distributed throughout a gelatinous body and the presence of cnidocytes or cnidoblasts, specialized cells with ejectable organelles used mainly for envenomation and capturing prey. Their bodies consist of mesoglea, a non-living, jelly-like substance, sandwiched between two layers of epithelium that are mostly one cell thick. Many cnidarian species can reproduce both sexually and asexually.

Excerpted from Wikipedia’s “Cnidaria” article, available under the CC BY-SA 4.0 licence.

Gallery (52)