What characteristics of phylum Cnidaria are most important in distinguishing it from other phyla.doc

1 features characteristics of protostomes such as

Info icon This preview shows pages 12–14. Sign up to view the full content.

View Full Document Right Arrow Icon
1. Features characteristics of protostomes such as spiral cleavage and trochophore larva. 2. coelom Diagram and explain the phylogeny of molluscan classes. Make sure to include a feature or two between each branch and node of the cladogram. Page 331 The anterior-most and posterior-most portions of the annelid body are the ___________ and _____________, respectively. Prostomium; pygidium Paired appendages used for locomotion in polychaetes are called ____________. The dorsal portion of this structure is called the ______________ while the ventral portion is called the ______________. parapodia; notopodia; neuropodia When earthworms mate, the __________________ secretes mucus to hold them together. clitellum Pogonophorans use symbiotic chemoautotrophic bacteria located in the _______________. bacteriocytes Discuss developmental similarities between protostomes coelomates. 1. blastopore (1st hole) becomes mouth, anus forms second 2. spiral cleavage 3. coelom created by splitting 4. Mosaic embry 5. No identical twins What characteristics of phylum Annelida distinguish it from other phyla? Segmentation/ Metamerism Chaetae - bundles of chitonous hairs Scaphopoda distinctive group of molluscs commonly known as the "tusk shells" because their shells are conical and slightly curved to the dorsal side, making the shells look like tiny tusks Glochidia bivalved larval stage of freshwater mussels. Cephalopod an active predatory mollusk of the large class Cephalopoda, such as an octopus or squid. Polyplacophora chitons all of which have the foot occupying the whole ventral surface of the body and the shell composed of eight calcified dorsal plates
Image of page 12

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

View Full Document Right Arrow Icon
Solenogastres one subclass of small, worm-like, shell-less molluscs (Aplacophora) Radula Rasping tongue found in most molluscs Labial palps In some Mollusca, one of a pair of flap-like folds at the end of each tentacle by which food is transported to the mouth. Planospiral having the shell coiled in one plane —used especially of foraminifers and gastropod mollusks monoplacophora meaning "bearing one plate", is a polyphyletic superclass of molluscs with a cap-like shell now living at the bottom of the deep sea. mantle soft extension of the body wall in certain invertebrates, for example, brachiopods and molluscs, which usually secretes a shell Gills the respiratory organ by which oxygen is extracted from water flowing over surfaces within or attached to the walls of the pharynx. shell the hard protective outer case of a mollusk or crustacean How are members of clade Clitella distinguished from polychaetes? presence of a Clitellum Describe the annelid body plan, including body wall, segments, coelom and its compartments, and coelomic lining. Explain how the hydrostatic skeleton of annelids helps them to burrow. How is the efficiency for burrowing increased by segmentation? 2 part head composed of prostomium and peristomium followed bysegmented body and a terminal portion called pygidium. head and pygidium are not segments. new segments develop right in front of pygidium with the oldest segments at the anterior end and the newest posterior.
Image of page 13
Image of page 14
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