Bio 201 F07 True lect 15 v2post

Bio 201 F07 True lect 15 v2post - Precambrian Porifera...

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Unformatted text preview: 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 Lophotrochozoans and Ecdysozoans These monophyletic groups emerged from DNA evidence in the last two decades Previously, morphological traits were thought to mark relationships Coelom conFguration Presence of segmentation Segmentation in annelid worms was thought to be homologous to segmentation in arthropods Remember these defnitions! 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 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 ....
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This note was uploaded on 04/09/2008 for the course BIOCHEMIST 361 taught by Professor Haltiwanger during the Fall '08 term at SUNY Stony Brook.

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Bio 201 F07 True lect 15 v2post - Precambrian Porifera...

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