Ward_Lect30A_Annelida_ppt

Ward_Lect30A_Annelida_ppt - BIS2C Winter 2009(Ward Lecture...

Info icon This preview shows pages 1–14. Sign up to view the full content.

View Full Document Right Arrow Icon
BIS2C Winter 2009 (Ward) Lecture 30. Annelida Today’s lecture (4 March) Mollusca concluded (cephalopods) introduction to Annelida major features biology within-group diversity Second Wednesday lecture Arthropoda (part 1)
Image of page 1

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

View Full Document Right Arrow Icon
Nematocyst-stealing nudibranchs some sea slugs ingest cnidarian tissue and store undischarged nematocysts in elongate protrusions on their back ready to fire the sea slug thus expropriates the defensive mechanism of another animal
Image of page 2
Solar-powered sea slugs certain sea slugs feed on algae they digest most algal tissue but sequester the chloroplasts in their in their body, where they continue to function kleptoplasty: the stealing of plastids for use as photosynthetic machines Sacoglossan, Placida cf. dendritica , showing the green network of ducts which contain the green chloroplasts from its algal food. From: www.seaslugforum.net
Image of page 3

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

View Full Document Right Arrow Icon
Cephalopods nautiluses, squids, octopuses, cuttlefish, etc. wholly marine; actively mobile predators largest and smartest invertebrates foot modified as tentacles and a siphon nautilus with shell, in others shell is internal (squid, cuttlefish) or lost (octopus) locomotion by jet propulsion: siphon expels water from mantle cavity
Image of page 4
Cephalopods nautiluses, squids, octopuses, cuttlefish, etc. capable of learning and memory tasks can learn by observation of others (experiments with octopuses)
Image of page 5

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

View Full Document Right Arrow Icon
Image of page 6
The cephalopod eye single lens eye convergent with that of vertebrates excellent visual acuity some common genes ( rhodopsin , PAX6 ) involved in eye development in the two groups concept of “deep homology” (see recent Nature article*) *Shubin, N. et al. 2009. Deep homology and the origins of evolutionary novelty. Nature 457 :818-823.
Image of page 7

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

View Full Document Right Arrow Icon
Communication in cephalopods is largely visual movements (of tentacles, fins, etc.) and body color changes chromatophores (cells with pigment): changes in shape changes in color
Image of page 8
Image of page 9

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

View Full Document Right Arrow Icon
Major lineages of metazoans Protostomes
Image of page 10
Major lineages of metazoans
Image of page 11

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

View Full Document Right Arrow Icon
Protostomes Annelida
Image of page 12
Which statement is true about Annelida and Mollusca?
Image of page 13

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

View Full Document Right Arrow Icon
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