startpage  register 04.03.24 -> 21:01:45 
°°° © - Die interaktive Webseite für Taucher °°° - marine creatures
  latest news 
  hotels   Hotel search!
  Amerika (1)
  Afrika (16)
  Europa (1)
  Asien (0)
  Australien (0)
  jobs worldwide   
  Amerika (0)
  Afrika (0)
  Europa (1)
  Asien (0)
  Australien (0)
  dictionary    Detail Info
  small advertisements  Search advert!
 ABC & Lead (3)
 Fins parts (5)
 Regulator (0)
 Clothing & Accessories (0)
 Bottles & Accessories (1)
 Instruments & watches (0)
 Jackets (0)
 Logbook stamp (0)
 Backpacks & Bags (0)
 Dive Computer (0)
 Techdiving (0)
 Dive Lights (3)
 Diving partner (0)
 Underwater Photography (4)
 Other Accessories (5)
  marine creatures  Search animal species!
 Amerika  (1)
 Afrika  (18)
 Europa  (4)
 Asien  (0)
 Australien  (0)
 Amerika (6)
 Afrika (175)
 Europa (11)
 Asien (0)
 Australien (32)
 Afrika & Madagaskar (0)
 Afrika Binnenseen (0)
 Afrika Ostkueste (0)
 Afrika Westkueste (0)
 Amerika Nord Binnen (0)
 Amerika Nord Ostkueste (0)
 Amerika Nord Westkueste (0)
 Amerika Sued Binnen (0)
 Amerika Sued Ostkueste (0)
 Amerika Sued Westkueste (0)
 Asien & Polynesien (0)
 Asien Binnenseen (0)
 Asien Kuestengebiete (0)
 Atlantischer Ozean (0)
 Australien & Neuseeland (0)
 Europa & Binnenseen (7)
 Golf von Mexiko (0)
 Indischer Ozean (0)
 Island & Kuestengebiete (0)
 Japanische See (0)
 Karibik (6)
 Mikronesien (0)
 Mittelamerika (0)
 Mittelmeer (0)
 Nordmeer & Beringsee (0)
 Nordsee & Aermelkanal (0)
 Ostsee (1)
 Pazifischer Ozean (0)
 Rotes Meer (63)
 Russland (0)
 Skandinavien & Kueste (0)
 Suedliches Meer (0)
  wrecks worldwide  
 Afrika & Madagaskar (2453) 
 Afrika Binnenseen (0) 
 Afrika Ostkueste (3) 
 Afrika Westkueste (0) 
 Amerika Nord Binnen (4960) 
 Amerika Nord Ostkueste (0) 
 Amerika Nord Westkueste (0) 
 Amerika Sued Binnen (41) 
 Amerika Sued Ostkueste (138) 
 Amerika Sued Westkueste (11) 
 Asien & Polynesien (189) 
 Asien Binnenseen (0) 
 Asien Kuestengebiete (0) 
 Atlantischer Ozean (0) 
 Australien & Neuseeland (0) 
 Europa & Binnenseen (25661) 
 Golf von Mexiko (0) 
 Indischer Ozean (1762) 
 Island & Kuestengebiete (0) 
 Japanische See (0) 
 Karibik (153) 
 Mikronesien (0) 
 Mittelamerika (749) 
 Mittelmeer (0) 
 Nordmeer & Beringsee (0) 
 Nordsee & Aermelkanal (0) 
 Ostsee (0) 
 Pazifischer Ozean (3815) 
 Rotes Meer (98) 
 Russland (0) 
 Skandinavien & Kueste (0) 
 Suedliches Meer (0) 
  publishing information
  data protection

We Recommend Firefox

marine animals universal time, time zones card, UTC
Startseite > Tiere > Stamm
Tardigrada  (Bärtierchen)   Tardigrada

Tardigrada, tardigrades, around 600 species of small (mostly up to 1 mm long) aquatic Metazoa inhabiting water-containing gap systems, algae, decaying foliage, parts of plants, submerged moss pads, other invertebrates (some as parasites), etc. Depending on the climatic conditions, the number of individuals can be extraordinarily high. There are two major subtaxa, Heterotardigrada and Eutardigrada. The cylindrical body, which consists of a head and four trunk segments, is covered by a cuticle, which is often sculptured in a species-specific manner and has thread-like or wing-like appendages, which is permeable to water (see fig.). The T. are somewhat transparent and, depending on the intestinal contents and pigmentation, colourless, yellow, brownish or green. Most species have eight pairs of externally unjointed walking legs with claws. Secreted by glands, there is a calcareous stylet in the oral cavity, which serves to puncture plant or animal food, which is then sucked out. The muscular pharynx acts as a suction pump. At the transition from the midgut to the rectum, "glands" with cells that have numerous mitochondria and an enlarged surface open out in Eutardigrada, and presumably serve excretion and osmoregulation. The nervous system consists of an upper pharyngeal ganglion and a lower pharyngeal ganglion as well as an abdominal ganglia chain with four pairs of ganglia. Heterotardigrada have innervated head appendages (cirri, papillae, club-shaped structures), Eutardigrada have at least four sensory fields on the head, which may carry chemo- or mechanoreceptors. In the upper pharyngeal ganglion there is usually a simple pigment cup ocellus with a visual cell on both sides. T. have no blood circulation and no respiratory organs.
root  Tardigrada (Bärtierchen) Tardigrada
Webseite drucken         RSS Feeds abonieren
Created by Ingo Arndt (Arndt-Webdesign) © 2009 - 2024