Kinorhyncha

Also known as kinorhynchs

Kinorhyncha (, ' "snout") is a phylum of small marine invertebrates that are widespread in mud or sand at all depths as part of the meiobenthos. They are commonly called mud dragons'''. Modern species are or less, but Cambrian forms could reach .

AI overview

Kinorhyncha is a phylum of tiny marine animals, nicknamed "mud dragons," that live in muddy and sandy ocean floors at all depths around the world. Though modern mud dragons are microscopic or smaller, ancient species from the Cambrian period could grow much larger, making them interesting subjects for understanding how life has changed over time.

AI-generated from the Wikipedia summary — may contain errors.

Species

kinorhynchs

Kinorhyncha

PHYLUM

KingdomAnimalia
PhylumKinorhyncha

Habitatmarine, brackish

目圓裂目 Cyclorhagida 平裂目 Homalorhagida 动吻动物门（學名：Kinorhyncha）是动物界的一个门。是一类生活在沿海底部泥沙中的、体表分节带（zonites）、无纤毛的假体腔动物。约有100种左右，例如动吻虫（Echinoderes）等。牠们的近亲是鎧甲动物门和鳃曳动物门，此三門統稱為有棘動物（Scalidophora）。形態動吻動物的軀幹上有空心的刺，體節數目少而且寬，體節上覆蓋骨板。有11個體節，刺較小。沒有眼睛。動吻動物的吻部在有棘動物中比較發達，例如动吻虫（Echinoderes）等，可見其明顯的吻部膨大結構。[1] 參考文獻 ^ 小白. 曳鰓、鎧甲、動吻：有棘動物類群. 2017年4月12日（中文（简体）‎）. 這是與無脊椎動物相關的小作品。你可以通过编辑或修订扩充其内容。查论编后鞭毛生物:动物现存门分类表域古菌细菌真核生物 (界植物 Hacrobia（英语：Template:Hacrobia）不等鞭毛类（英语：Template:Heterokont）囊泡虫有孔虫（英语：Template:Rhizaria）古虫变形虫（英语：Template:Amoebozoa）动物真菌) 侧生动物多孔动物门钙质海绵纲寻常海绵纲六放海绵纲扁盘动物门丝盘虫中生动物直泳动物门菱形动物门单胚动物门真后生动物辐射对称动物栉水母动物门刺胞动物门珊瑚纲水螅纲钵水母纲立方水母纲十字水母纲（英语：Stauromedusae）多足动物纲（英语：Polypodiozoa）黏体动物两侧对称动物异无腔动物无腔动物门异涡动物门肾管动物（英语：Nephrozoa）原口动物未命名基群毛颚动物门蜕皮动物环神经动物（英语：Cycloneuralia）有棘动物（英语：Scalidophora）动吻动物门铠甲动物门鳃曳动物门线虫动物线虫动物门线形动物门泛节肢动物有爪动物门缓步动物门节肢动物门螺旋動物有颚动物（英语：Gnathifera (clade)）合皮动物（英语：Syndermata）轮形动物门棘头动物门地位未定尾盘动物门? 摇轮虫颚胃动物门微颚动物门环口动物门扁轮动物（英语：Platytrochozoa）吮食动物（英语：Rouphozoa）扁形动物门腹毛动物门冠轮动物担轮动物纽形动物门软体动物门环节动物门星虫动物门? 触手冠动物苔藓动物门内肛动物门腕足动物门帚虫动物门后口动物步带动物棘皮动物门半索动物门脊索动物门有头动物脊椎动物亚门盲鳗纲头索动物亚门尾索动物亚门 (?)为地位未定取自“https://zh.wikipedia.org/w/index.php?title=动吻动物

via GBIF

Wikidata facts

Image: Echinoderes hwiizaa.jpg

~6 min read

Article

6 sections

Contents

Anatomy
Reproduction
Classification
Taxonomy
References
External links

Kinorhyncha (, ' "snout") is a phylum of small marine invertebrates that are widespread in mud or sand at all depths as part of the meiobenthos. They are commonly called mud dragons'. Modern species are or less, but Cambrian forms could reach .

== Anatomy == thumb|left|Living Echinoderes specimen, showing movement and head retraction Kinorhynchs are limbless animals, with a body consisting of a head, neck, and a trunk of eleven segments. They are the only members of Ecdysozoa, except from the panarthropoda, with a segmented body; a feature that probably evolved independently from them. Juveniles have eight or nine segments, depending on genus, with the last two or three being added later during growth. A Cambrian species, Eokinorhynchus rarus, had about twice as many segments as present forms. Like other ecdysozoans they do not have external cilia, but instead have a number of spines along the body, plus up to seven circles of spines around the head. These spines are used for locomotion, withdrawing the head and pushing forward, then gripping the substrate with the spines while drawing up the body.