{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Bio 201 F07 True lect 15 v2post

Bio 201 F07 True lect 15 v2post - Platyhelminthes Cnidaria...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Precambrian Porifera Cnidaria Ctenophora Platyhelminthes Rotifera Nemertea Bryozoa Phoronida Brachiopoda Mollusca Annelida Nematoda Arthropoda Echinodermata Chordata Campbell Fig. 32.8 p. 640 Ancestral Colonial choanoflagellate Parazoa Radiata Eumetazoa Bilateria Protostomia Deuterostomia Lophotrochozoa Ecdysozoa
Background image of page 1

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

View Full Document Right Arrow Icon
Lophotrochozoans and Ecdysozoans • These monophyletic groups emerged from DNA evidence in the last two decades Previously, morphological traits were thought to mark relationships Coelom configuration Presence of segmentation Segmentation in annelid worms was thought to be homologous to segmentation in arthropods Remember these definitions!
Background image of page 2
“Lophotrochozoans” have “trochophore” larvae. Some other lophotrochozoans have lophophore adult body forms (not these worms). Library.thinkquest.org/26153/marine/bryozoa.htm bscd.bsd.uchicago.edu/classes/biosci184/images/trochophore.gif
Background image of page 3

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

View Full Document Right Arrow Icon
Ecdysozoans increase in body size through molting (shedding the cuticle and secreting a new one), which is regulated by the hormone 20- hydroxyecdysone nematode life cycle; Each larval (L) stage goes through a round of molting . Molting in a fossil trilobite, an extinct arthropod
Background image of page 4
The worm way of life We will discuss 2 different phyla called worms (there are several more)
Background 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
This is the end of the preview. Sign up to access the rest of the document.
  • Fall '08
  • Haltiwanger
  • Annelid, setae, Radiata Parazoa Eumetazoa Ancestral Colonial choanoflagellate Bilateria, Protostomia Radiata Parazoa, Radiata Parazoa Eumetazoa, Ancestral Colonial choanoflagellate

{[ snackBarMessage ]}