Oct 18 - Animals Lecture #10

Trochophore larva o may feed catching small plankton

Info icon This preview shows pages 6–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Trochophore larva o May feed, catching small plankton in prototroch, planktotrophic. Can have long planktonic lives o Non-feeding trochophores have large yolk reserves, lecithotrophic. Have short planktonic lives Trochophore larval development o May exhibit direct metamorphosis into a small juvenile (e.g. in polyplacophorans, chitons) o In bivalves, most often develop into a second, free-swimming larval stage. Veliger larva. o Veliger is symmetrical and enclosed within 2 valves (shell) o Velum Function; Locomotion Food collection Gas exchange
Image of page 6

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

View Full Document Right Arrow Icon
Veliger larva modificatioin in freshwater bivalves: Glochidium larva o Microscopic non-swimming shelled larva o Miniature pacman o Ectoparasitic on fishes for a short period of time o Initially ectoparasitic (10-30 days) on fish o Attaches to fish gills, encyst and feed by phagocytosis o Grows to miniature adult o Harmless to fishes o How do they get on the gills on fishes?
Image of page 7
Males release gametes into water o when a predatory fishes come near it, the shell will shut closed releasing the larva on the fish (and its gills) o Glochidia package – ovisac Fish Think it’s a worm but when it bites , secretion comes out into the mouth of the animal
Image of page 8

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

View Full Document Right Arrow Icon
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.
  • Fall '08
  • KELLY
  • mantle cavity, buccal mass, Hypothetical Ancestral Mollusc, Phylum Mollusca CH, Trochophore larval development

{[ 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