Ch32 Lecture-Spr11

Ch32 Lecture-Spr11 - 32 Protostome Animals 32.1 What Is a...

Info iconThis preview shows pages 1–16. Sign up to view the full content.

View Full Document Right Arrow Icon
Protostome Animals 32
Background image of page 1

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

View Full DocumentRight Arrow Icon
32.1 What Is a Protostome? Two triploblastic clades of Bilateria : protostomes and deuterostomes diverged in Cambrian, over 505 mya Protostomes have far more species and individuals In most, embryonic blastopore becomes mouth In insects, no blastopore forms www.emc.maricopa.edu/faculty/farabee/BIOBK
Background image of page 2
32.1 What Is a Protostome? Two major clades of protostomes mostly based on DNA sequences: Lophotrochozoans Ecdysozoans
Background image of page 3

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

View Full DocumentRight Arrow Icon
Figure 32.1 Phylogenetic Tree of Protostomes (Part 1)
Background image of page 4
Figure 32.1 Phylogenetic Tree of Protostomes (Part 2)
Background image of page 5

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

View Full DocumentRight Arrow Icon
32.1 What Is a Protostome? Other general characters of protostomes bilaterally symmetrical anterior brain that surrounds the entrance to digestive tract ventral nervous system with paired or fused longitudinal nerve cords http://organicwaste.com.au/wp- content/uploads/2009/06/earthworm-anatomy.gif
Background image of page 6
32.1 What Is a Protostome? The common ancestor had a coelom , but some lineages have modifications: Flatworms are acoelomate (coelom has been lost) Some lineages have a pseudocoelom Arthropods — the body cavity became a hemocoel or blood chamber, part of the open circulatory system http://science.kennesaw.edu/~jdirnbe r/InvertZoo/Tree/coelom.jpg
Background image of page 7

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

View Full DocumentRight Arrow Icon
32.1 What Is a Protostome? Mollusks have an open circulatory system similar to the hemocoel but retain vestiges of an enclosed coelom Reduced coelom http://kentsimmons.uwinnipeg.ca/16cm05/ 1116/33-16-MolluskBodyPlan-L.gif
Background image of page 8
Background image of page 9

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

View Full DocumentRight Arrow Icon
Protostomes, Lophotrochozoans Lophotrochozoans - Include flatworms, rotifera, annelids, molluscans Several groups have lophophore , a circular or U-shaped ridge around mouth with two rows of hollow, ciliated tentacles The lophophore functions in food collection and gas exchange. http://bioweb.uwlax.edu/zoolab/Table_of_ Contents/Lab-6a/Phylum_Ectoprocta_2
Background image of page 10
Protostomes, Lophotrochozoans The lophophore appears to have evolved independently several times; or it is ancestral and has been lost by some groups Nearly all animals with a lophophore are sessile as adults (bryozoans, brachiopods, phoronids) www.scuba-equipment-usa.com/marine/DEC04/images Black Phoronid Worm ( Phoronis australis )
Background image of page 11

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

View Full DocumentRight Arrow Icon
Figure 32.2 Bryozoans Use Their Lophophore to Feed A bryozoan with extended lophophores
Background image of page 12
Protostomes, Lophotrochozoans Some lophotrochozoans have a larval form known as a trochophore that moves by beating a band of cilia. This also brings phytoplankton closer where they can be captured and ingested. Mollusks, annelids, ribbon worms, and bryozoans have trochophore larvae. It is probably ancestral, but lost in some groups. http://upload.wikimedia.org/wikipedia/comm ons/c/cb/Haliotis_asinina_trochophore.jpg Trochophore of the Ass's-ear abalone, Haliotis asinina
Background image of page 13

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

View Full DocumentRight Arrow Icon
Figure 31.11 Planktonic Larval Forms of Marine Animals (A)
Background image of page 14
Protostomes, Lophotrochozoans Some lophotrochozoans have spiral cleavage (flatworms, ribbon worms, annelids, mollusks) Many are worm-like good shape for burrowing into soft sediments
Background image of page 15

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

View Full DocumentRight Arrow Icon
Image of page 16
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 145

Ch32 Lecture-Spr11 - 32 Protostome Animals 32.1 What Is a...

This preview shows document pages 1 - 16. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online