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Cephalochordata
They have long body type. They are less than 5cm in length.
Lancelets have separate sexes and there are equal numbers of males and females in a population.
Fertilized eggs are formed when sperms and eggs are released into the water. The fertilized eggs will be form into larvae.
Larvae transform into young lancelets when fifteen pairs of gill slits have formed.
General body plan
Cephalochordata is closely related to
-Urochordates, sometimes known as the Tunicata (sea squirt).
-Craniates (Hagfish & Lamprey)
Kingdom: Animalia
Phylum: Chordata
Members of this Phylum (Eg: Sea squirt, Tunicates, bony fish, amphibians, reptiles, birds, mammals)
What is an alternative name for Cephalochordata?
a-bony fish
b- lancelets or
c-amphioxus
d-b and c
e-NOTA
Bibliography
http://eol.org/pages/1585/overview
http://www.britannica.com/EBchecked/topic/103023/cephalochordate/49501/Natural-history
http://animals.jrank.org/pages/1663/Lancelets-Cephalochordata-BEHAVIOR-REPRODUCTION.html
http://www.google.com/imgres?um=1&hl=en&sa=N&biw=1333&bih=645&tbm=isch&tbnid=LkSATja1wR5YoM:&imgrefurl=http://biology.unm.edu/ccouncil/Biology_203/Summaries/Deuterostomes.htm&docid=WhDZNiKRZHrEzM&imgurl=http://biology.unm.edu/ccouncil/Biology_203/Images/Deuterostomes/lancelet.JPG&w=628&h=420&ei=7bWLT-HHDpTJiQKVjNnVCw&zoom=1&iact=hc&vpx=923&vpy=60&dur=302&hovh=184&hovw=275&tx=97&ty=152&sig=109769362565875163775&page=1&tbnh=140&tbnw=192&start=0&ndsp=18&ved=1t:429,r:10,s:0,i:91
https://docs.google.com/viewer?a=v&q=cache:AIxTzclZYXQJ:iweb.tntech.edu/cabrown/Zoology/Zoo%2520Lectures/Hemichordata1110.pdf+cephalochordata+anatomy+test&hl=en&gl=us&pid=bl&srcid=ADGEESjSkRdrIGpVjGK6iOGOnhs5ybWXWROPvxZKh93oPRRapbNeOuDOB9bANYfyX0TIXo62p1F92wzZ_9cSoJoiogpS0UhHAUdKAWmZxH--kWsQKFUoZUvM9H1JnHxqq4G23eJPW6GZ&sig=AHIEtbQJw2HR1Qu2WofFaRwRdPRIIiJ4ww
By Kily Nhan
They have long body type. They are less than 5cm in length.
The water get into the Atrium and exit throw the Atriopore. The food particles move from the Pharyngeal slits to the guts and get digested and get out throw the Anus.
Water and the food particles get in throw mouth and get into the Pharyngeal slits. Pharyngeal slits is where the food particles and the food are separated.
Photo based on: 'horizon' by pierreyves @ flickr