World Library  
Flag as Inappropriate
Email this Article

Tanaidacea

Article Id: WHEBN0002014152
Reproduction Date:

Title: Tanaidacea  
Author: World Heritage Encyclopedia
Language: English
Subject: Tanaidacea, Scotoplanes, Crustacea, Hoplocarida, Malacostraca
Collection: Malacostraca, Tanaidacea
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Tanaidacea

Tanaidacea
Tanaissus lilljeborgi
(a tanaid from the North Sea)
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Malacostraca
Superorder: Peracarida
Order: Tanaidacea
Dana, 1849
Suborders

The crustacean order Tanaidacea (known as tanaids) make up a minor group within the class (biology) Malacostraca. There are about 940 species in this order.

Contents

  • Description 1
  • Habitat 2
  • Life cycle 3
  • Taxonomy 4
  • See also 5
  • References 6
  • External links 7

Description

Tanaids are small, shrimp-like creatures ranging from 0.5 to 120 millimetres (0.020 to 4.7 in) in adult size, with most species being from 2 to 5 millimetres (0.08 to 0.2 in). Their carapace covers the first two segments of the thorax. There are three pairs of limbs on the thorax; a small pair of maxillipeds, a pair of large clawed gnathopods, and a pair of pereiopods adapted for burrowing into the mud. Unusually among crustaceans, the remaining six thoracic segments have no limbs at all, but each of the first five abdominal segments normally carry pleopods. The final segment is fused with the telson and carries a pair of uropods.[1]

The gills lie on the inner surface of the carapace. The thoracic limbs wash water towards the mouth, filtering out small particles of food with the mouthparts or maxillipeds. Some species actively hunt prey, either as their only food source, or in combination with filter feeding.[1]

Habitat

Most are marine, but some are also found in freshwater coastal habitat or estuaries. The majority of species are bottom-dwellers in shallow water environments, but a few live in very deep water, exceeding for some species 9,000 metres (30,000 ft). In some deep sea environment, they represent the most abundant and diverse fauna to be found.

Life cycle

Tanaids do not undergo a true planktonic stage. The early developmental period is spent while young are within the marsupium of the mother. Subsequently, post-larvae, called mancas, emerge as epibenthic forms. Some species are hermaphroditic.[1]

Taxonomy

The order Tanaidacea is divided into the following sub-orders, superfamilies and families:[2]

Anthracocaridomorpha Sieg, 1980
Apseudomorpha Sieg, 1980
Neotanaidomorpha Sieg, 1980
Tanaidomorpha Sieg, 1980
  • Tanaidomorpha incertae sedis

See also

References

  1. ^ a b c Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. pp. 768–769.  
  2. ^ WoRMS (2011). "Tanaidacea".  

External links

Data related to Tanaidacea at Wikispecies

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.