FACTOID # 39: The eight most developed countries all speak Germanic languages.
 
 Home   Encyclopedia   Statistics   Countries A-Z   Flags   Maps   Education   Forum   FAQ   About 
 
WHAT'S NEW
RELATED ARTICLES
People who viewed "Phacopida" also viewed:
RECENT ARTICLES
More Recent Articles »
 

FACTS & STATISTICS    Simple view

  1. Select countries to view: (hold down Control key and click to select several)

     

     

    Compare:

     

     
  1. Select fact or statistic: (* = graphable)

     

     

     

  2. (OPTIONAL) Compare to statistic: (both need to be graphable)

     

     

     

  3. View result as:

     

       
(OR) SEARCH ALL encyclopedia, stats & forums:   

Encyclopedia > Phacopida

Phacopida is an order of trilobite. It is made up of a morphologically diverse group of related suborders.


The origin of the Phacopida order is uncertain. The three suborders Phacopina, Calymenina, and Cheirurina, all share a distinctive protaspis (developmental stage lacking segments) type. This sort of similarity in development suggests phylogenetic unity. The Calymenina suborder is the most primitive of the Phacopida order.


Phacops rana is one of the most well-known members of this order.


  Results from FactBites:
 
Phacopida at AllExperts (298 words)
Phacopida is an order of trilobite that lived from the Ordovician to the Devonian.
The suborder Calymenina is the most primitive of the Phacopida order and shares some characteristics with the order Ptychopariida, though it is not included in the subclass Libristoma.
Phacopida had 8 to 19 thoracic segments and are distinguishable by the expanded glabella, short or absent preglabellar area, and schizochroal (Phacopina) or holochroal (Cheirurina and Calymenina) eyes.
Phacopida - Wikipedia, the free encyclopedia (265 words)
It is made up of a morphologically diverse group of related suborders.
The origin of the Phacopida order is uncertain.
Schizochroal eyes are compound eyes with up to around 700 separate lenses.
  More results at FactBites »


 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments
Please enter the 5-letter protection code

Want to know more?
Search encyclopedia, statistics and forums:
 


Lesson Plans | Student Area | Student FAQ | Reviews | Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms.