Ambulacraria

Ambulacraria
	Bipinnary larva of a starfish .
Systematics
without rank:	Holozoa
without rank:	Multicellular animals (Metazoa)
without rank:	Tissue animals (Eumetazoa)
without rank:	Bilateria
Over trunk :	Neumünder (Deuterostomia)
without rank:	Ambulacraria
Scientific name
	Ambulacraria
	Metschnikoff , 1881

The Ambulacraria or Coelomorpha are a rank-less taxon (a family group) in which two tribes of invertebrates are united, the gill monkeys (Hemichordata) and the echinoderms (Echinodermata). All ambulacraria are marine animals , which as larvae ( Tornaria and dipleurula ) planktonic (floating in water) and as adult animals benthic are at the bottom (dead).

features

The ambulacraria have as a common feature a threefold body and coelom (body cavity) (Archimerie, Trimerie): the Prosoma with the Protocoel (upper portion of the coelom) which Mesosoma , with the Mesocoel (middle portion of the coelom) and the Metasoma with the Metacoel (posterior section of the coelom). The mesosoma and metasoma are heavily modified in adult echinoderms.

The larvae of Ambulacraria - the tornary larvae of the gill lobsters and the dipleurula larvae as well as the larval types of the echinoderms derived from them - have eyelash strips called Neotorch and Archeotorch around the mouth and anus. Further features are a ciliated apical organ on the protocoel and numerous serotonin cells .

literature

Hynek Burda , Gero Hilken, Jan Zrzavý: Systematic Zoology. UTB, Stuttgart; : 1st edition 2008, pages 220-221, ISBN 3-8252-3119-4

Individual evidence

↑ El. Metschnikoff: About the systematic position of Balanoglossus. In: Zoologischer Anzeiger , Vol. 4, pp. 153–157, 1881. (digitized version)

[Metschnikoff,_1881-1] El. Metschnikoff: About the systematic position of Balanoglossus. In: Zoologischer Anzeiger , Vol. 4, pp. 153–157, 1881. (digitized version)