Chordata Practical - Chordata 1 3 Subphyla of Chordata 1...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chordata 1. 3 Subphyla of Chordata: 1) Vertebrata 2) Urochordata 3) Cephalochordata 2. Characteristics of Chordata: 1) name of this phylum is derived from the dorsal stiff, yet flexible rod called the notochord 2) also has a dorsal, hollow nerve chord 3) presence of outpocketings of the pharynx called pharyngeal pouches; in primitive organisms they function in feeding; in other chordates the pouches close and eventually develop into structures seen in the adult (ex: Eustachian tube) 4) muscular, postanal tail 3. Earliest chordates were most likely filter feeders 4 . Urochordata and cephalochordata are exclusively marine Urochordata 1. majority are sessile and covered by a fibrous tunic that surrounds the organism and gives the phylum its common name (tunicates) 2. Aka sea squirt because they expel water forcibly from the excurrent siphon 3. Most found in shallow waters 4. Adults are sessile and only show the defining chordate characteristic of pharyngeal basket used for feeding 5. Water enters the incurrent siphon then the pharyngeal slits and out the excurrent siphon Cephalochordata: 1. aka lancelets 2. scaleless, fishlike chordates that are very small 3. all characteristics are apparent in this subphylum 4. shaped blocks of muscle called myomeres enable lancelets to swim Vertebrata: 1. most diverse chordates 2.
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern